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Heat Transfer in Nucleate Pool Boiling of Binary and Ternary Refrigerant Mixtures 被引量:2
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作者 赵耀华 刁彦华 +1 位作者 鹤田隆治 西川日出男 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2004年第3期351-356,共6页
Heat transfer coefficients in nucleate pool boiling were measured on a horizontal copper surface for refrigerants, HFC-134a, HFC-32, and HFC-125, their binary and ternary mixtures under saturated conditions at 0.9MPa.... Heat transfer coefficients in nucleate pool boiling were measured on a horizontal copper surface for refrigerants, HFC-134a, HFC-32, and HFC-125, their binary and ternary mixtures under saturated conditions at 0.9MPa. Compared to pure components, both binary and ternary mixtures showed lower heat transfer coefficients.This deterioration was more pronounced as heat flux was increased. Experimental data were compared with some empirical and semi-empirical correlations available in literature. For binary mixture, the accuracy of the correlations varied considerably with mixtures and the heat flux. Experimental data for HFC-32/134a/125 were also compared with available correlated equation obtained by Thome. For ternary mixture, the boiling range of binary mixture composed by the pure fluids with the lowest and the medium boiling points, and their concentration difference had important effects on boiling heat transfer coefficients. 展开更多
关键词 pool boiling heat transfer nucleate pool boiling HFC-134A HFC-32 HFC-125
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Enrichment of Fetal Nucleated Red Blood Cells by Multi-core Magnetic Composite Particles for Non-invasive Prenatal Diagnosis 被引量:1
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作者 PAN Ying WANG Qing +7 位作者 HUANG Wen-jun QIAO Feng-1i LIU Yu-ping ZHANG Yu-cheng HAI De-yang DU Ying,ting WANG Wen-yue ZHANG Ai-chen 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2012年第3期443-448,共6页
A novel kind of multi-core magnetic composite particles, the surfaces of which were respectively mo- dified with goat-anti-mouse IgG and antitransferrin receptor(anti-CD71), was prepared. The fetal nucleated red blo... A novel kind of multi-core magnetic composite particles, the surfaces of which were respectively mo- dified with goat-anti-mouse IgG and antitransferrin receptor(anti-CD71), was prepared. The fetal nucleated red blood cells(FNRBCs) in the peripheral blood of a gravida were rapidly and effectively enriched and separated by the mo- dified multi-core magnetic composite particles in an external magnetic field. The obtained FNRBCs were used for the identification of the fetal sex by means of fluorescence in situ hybridization(FISH) technique. The results demonstrate that the multi-core magnetic composite particles meet the requirements for the enrichment and speration of FNRBCs with a low concentration and the accuracy of detetion for the diagnosis of fetal sex reached to 95%. Moreover, the obtained FNRBCs were applied to the non-invasive diagnosis of Down syndrome and chromosome 3p21 was de- tected. The above facts indicate that the novel multi-core magnetic composite particles-based method is simple, relia- ble and cost-effective and has opened up vast vistas for the potential application in clinic non-invasive prenatal diag- nosis. 展开更多
关键词 Fetal nucleated red blood cell(FNRBC) Prenatal diagnosis NON-INVASIVE Multi-core magnetic compositeparticle
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Concerning The Effect of Surface Material on Nucleate Boiling Heat Transfer of R-113 被引量:2
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作者 Reza Hosseini Amir Gholaminejad Mahdi Nabil 《Journal of Electronics Cooling and Thermal Control》 2011年第2期22-27,共6页
This paper presents results of an experimental investigation carried out to determine the effects of surface material on nucleate pool boiling heat transfer of refrigerant R113. Experiments were performed on horizonta... This paper presents results of an experimental investigation carried out to determine the effects of surface material on nucleate pool boiling heat transfer of refrigerant R113. Experiments were performed on horizontal circular plates of brass, copper and aluminum. The heat transfer coefficient was evaluated by measuring wall superheat and effective heat flux removed by boiling. The experiments were carried out in the heat flux range of 8 to 200 kW/m2. The obtained results have shown significant effect of surface material, with copper providing the highest heat transfer coefficient among the samples, and aluminum the least. There was negligible difference at low heat fluxes, but copper showed 23% better performance at high heat fluxes than aluminum and 18% better than brass. 展开更多
关键词 BOILING HEAT TRANSFER R-113 nucleate BOILING SURFACE MATERIAL
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Isolation of Fetal Nucleated Red Blood Cells from Maternal Blood 被引量:1
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作者 邹丽 叶晓静 +1 位作者 徐可树 朱剑文 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2000年第2期169-171,共3页
To find a simple, effective method of isolating fetal cells from maternal peripheral blood for prenatal diagnosis, 45 women were studied with their gestation being 6-14 weeks and age 21- 30 years. The fetal cells wer... To find a simple, effective method of isolating fetal cells from maternal peripheral blood for prenatal diagnosis, 45 women were studied with their gestation being 6-14 weeks and age 21- 30 years. The fetal cells were isolated from maternal blood by using discontinuous density gradient centrifugation. Some of the isolated cells were made smear and counted under the microscope; others were used for predicting fetal sex by PCR amplification of Y chromosome specific DYZ1 gene. The major cells in the upper separation interface were lymphocytes and monocytes, with occasionally seen nucleated red blood cells (NRBC); while those in the middle separation interface were neutrocytes, with NRBC scattering. The ratio of NRBC/nucleated cells was 1. 98±0. 28× 10-5. There was no significant difference between the first and second trimester (P>0. 05). The amount of isolated fetal cells was sufficient for prenatal genetic diagnosis. Male pregnancy was correctly predicted in 10 out of 13 cases. It is concluded that the method of discontinuous density gradient centrifugation was of considerable importance in the development of non-invasive prenatal genetic diagnosis. 展开更多
关键词 maternal peripheral blood nucleated red blood cell sex identification polymerase chain reaction
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ENHANCEMENT OF NUCLEATE BOILING HEAT TRANSFER WITH ADDITIVES
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作者 刘天庆 蔡振业 林纪方 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 1992年第1期1-7,共7页
Based on the tests of more than ten different additives, several effective additives are found capable of improving the boiling heat transfer behavior of water pronouncedly. The mechanism of the enhancement of nucleat... Based on the tests of more than ten different additives, several effective additives are found capable of improving the boiling heat transfer behavior of water pronouncedly. The mechanism of the enhancement of nucleate boiling with additives has been investigated, and the results indicate that one of the important reasons is that the nucleation sites have been increased. 展开更多
关键词 nucleate BOILING HEAT TRANSFER ADDITIVE
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Detection of Fetal Nucleated Erythrocytes and Fetal DNA from Peripheral Blood of Pregnant Women
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作者 张铭 陈汉平 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2003年第1期65-67,共3页
In order to search for a more reliable method of sorting fetal nucleated red blood cells (NRBCs) and DNA from maternal peripheral blood and to identify origin of NRBCs and DNA, NRBCs were isolated from peripheral bloo... In order to search for a more reliable method of sorting fetal nucleated red blood cells (NRBCs) and DNA from maternal peripheral blood and to identify origin of NRBCs and DNA, NRBCs were isolated from peripheral blood of 88 pregnant women by density gradient centrifugation and fluorescence activated cell sorter (FACS) respectively. Nested polymerase chain reaction was used to detect normal male SRY gene from blood plasma DNA of 65 pregnant women. The results revealed that fetal NRBCs were found in 14 of 27 maternal samples by density gradient centrifugation. The number of cells was from 1 to 10. Using FACS, CD71 + cells were identified among all 61 samples. The frequency was (0.35±0.25)×10 -2; The detectable rate of the SRY gene of blood plasma DNA from 46 women carrying male fetuses was 65.22 % (30/46). Non-detectable rate for 19 women carrying female fetuses was 94.74 % (18/19). It was concluded that the methods of sorting fetal NRBCs and DNA have already made great progress. The methods for fetal NRBCs and plasma DNA from maternal peripheral blood to diagnose genetic diseases seem to be the best methods of noninvasive prenatal diagnosis. 展开更多
关键词 nucleated red blood cells fetal DNA prenatal diagnosis
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Y Specific Sequence Gene Analysis of Single Fetal Nucleated Erythroblasts from the Peripheral Blood of Pregnant Women
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作者 王陶然 陈汉平 +1 位作者 卢运萍 马庭元 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2001年第2期163-165,共3页
The single cell isolation technique was used to detect fetal nucleated erythroblasts at a single cell level from the peripheral blood of pregnant women in order to investigate the feasibility of this method for nonin... The single cell isolation technique was used to detect fetal nucleated erythroblasts at a single cell level from the peripheral blood of pregnant women in order to investigate the feasibility of this method for noninvasive prenatal diagnosis. Single fetal nucleated erythroblasts were isolated from the peripheral blood samples from 51 pregnant women by micromanipulation techniques after density gradient centrifugation. Nested polymerase chain reaction method was used to amplify the SRY gene. It was found that the concordance rate of amplification results with real fetal sex was 82.61 %. The sensitivity and specificity were 80 % and 87.50 % respectively. It was suggested that it is feasible and promising in non invasive prenatal diagnosis to detect fetal nucleated erythroblasts at a single cell level by using micromanipulation techniques. 展开更多
关键词 single cell peripheral blood of pregnant woman fetal nucleated erythroblasts nested polymerase chain reaction
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Critical volume fraction and size for a colloidal cluster to nucleate
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作者 赵丹丹 龙联丰 肖长明 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第12期577-580,共4页
With the aid of the critical size of colloidal cluster, the critical volume fraction of phase transition of colloidal system is determined by the principle of entropy maximum and Carnahan-Starling (CS) state equatio... With the aid of the critical size of colloidal cluster, the critical volume fraction of phase transition of colloidal system is determined by the principle of entropy maximum and Carnahan-Starling (CS) state equation in this paper. In our discussion, no parameter is introduced externally, and our results are in good agreement with the experimental results. 展开更多
关键词 depletion interaction nucleation packing CLUSTER
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Numerical investigation of heat transfer performance and bubble behavior of nucleate pool boiling in a confined space under rolling conditions
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作者 Jianjie Cheng Jiangwei Sun +3 位作者 Weihao Ji Yu Dong Wei Li Yurong Chen 《Energy Storage and Saving》 2023年第1期336-347,共12页
Nucleate pool boiling process is widely used in heat exchangers because of its excellent heat transfer performance.With the gradual increase of applications,more and more equipments work in a non-static state,but ther... Nucleate pool boiling process is widely used in heat exchangers because of its excellent heat transfer performance.With the gradual increase of applications,more and more equipments work in a non-static state,but there is little research under rolling conditions.Therefore,it is necessary to investigate the influence of rolling motion on the nucleate pool boiling process.In this study,a numerical investigation of the nucleate pool boiling process under static and rolling conditions is performed based on the volume-of-fluid(VOF)method.Physical fields and phase distribution under static state and rolling motion are compared to investigate the effect of rolling motion on the nucleate pool boiling process.The results show that rolling motion greatly influences the bubble behavior and void fraction owing to the differences between flow fields.The void fraction decreased by 11.84%,48.82%,and 56.87%as the maximum rolling angle increased from 15°to 45°,and by 11.84%,22.27%,and 21.81%as the rolling period increased from 1 s to 3 s.The void fraction decreased by 11.84%,48.82%,and 56.87%as the maximum rolling angle increased from 15°to 45°.The heat transfer coefficients of different cases are compared,and it is found that the effects of rolling motion on heat transfer coefficients can be ignored. 展开更多
关键词 nucleate pool boiling Rolling condition Bubble behavior Heat transfer characteristic
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Reexamination of Correlations for Nucleate SiteDistribution on Boiling Surface by Fractal Theory 被引量:4
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作者 Yang Chunxin(University of Aeronautics and Astronautics, 100083 Beijing, China) 《Journal of Thermal Science》 SCIE EI CAS CSCD 1997年第2期128-131,共4页
Nucleate site distribution plays an essential role in nucleate boiling process. In this paper1 it is pointed out that the size and spatial distribution density of nucleate sites presented on real boiling surface can b... Nucleate site distribution plays an essential role in nucleate boiling process. In this paper1 it is pointed out that the size and spatial distribution density of nucleate sites presented on real boiling surface can be described by the normalized fractal distribution function, and the physical meaning of parameters involved in some experimental correlations proposed by early investigations are identified according to fractal distribution function. It is further suggested that the surface micro geometry characteristics such as the shape of cavities should be described and analyzed qualitatively by using fractal theory. 展开更多
关键词 nucleate site distribution density nucleate boiling fractal theory
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A fractal study for nucleate pool boiling heat transfer of nanofluids 被引量:6
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作者 XIAO BoQi 1 , JIANG GuoPing 2 & CHEN LingXia 1 1 Department of Physics and Electromechanical Engineering, Sanming University, Sanming 365004, China 2 Earthquake Engineering Research Test Center, Guangzhou University, Guangzhou 510405, China 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2010年第1期30-37,共8页
In this paper, a fractal model for nucleate pool boiling heat transfer of nanofluids is developed based on the fractal distribution of nanoparticles and nucleation sites on boiling surfaces. The model shows the depend... In this paper, a fractal model for nucleate pool boiling heat transfer of nanofluids is developed based on the fractal distribution of nanoparticles and nucleation sites on boiling surfaces. The model shows the dependences of the heat flux on nanoparticle size and the nanoparticle volume fraction of the suspension, the fractal dimension of the nanoparticle and nucleation site, temperature of nanofluids and properties of fluids. The fractal model predictions show that the natural convection stage continues relatively longer in the case of nanofluids. The addition of nanoparticles causes a decrease of the pool nucleate boiling heat transfer. The nucleate pool boiling heat transfer coefficient is decreased by increasing particle concentration. An excellent agreement between the proposed model predictions and experimental data is found. The validity of the fractal model for nucleate pool boiling heat transfer is thus verified. 展开更多
关键词 NANOFLUID nucleate POOL BOILING FRACTAL heat TRANSFER
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A thermal-hydrodynamic coupling method for simulating the interplay between bubble departure and wall temperature variation in nucleate boiling 被引量:2
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作者 Feng Pan Li-zhong Mu +2 位作者 Ying He Chao-jie Wang Shi-xiong Zhou 《Journal of Hydrodynamics》 SCIE EI CSCD 2021年第2期243-258,共16页
A thermal-hydrodynamic coupling model is used to investigate the interplay between the wall temperature distribution and the bubble departure during the nucleate boiling process.The boiling process is modeled as the c... A thermal-hydrodynamic coupling model is used to investigate the interplay between the wall temperature distribution and the bubble departure during the nucleate boiling process.The boiling process is modeled as the combination of three subprocesses:the transient heat conduction process in the solid heater,the evaporation of the microlayer underneath the bubble,and the bubble dynamics in the two-phase bulk fluid region.The moving bubble interface is captured by the volume of fluid method in the OpenFOAM framework.The proposed model is validated against the experimental results of the boiling process of the water on an Indium Tin Oxide heater.The predicted results agree well with related measurements in the literature.Following the validation,the effects of the boiling heat flux on the bubble departure period are examined.The results show that the bubble departure period decreases with the increase of the applied heat flux.High heat flux will cause irregularity in the departure periods for successive bubbles due to the influence of the wake flow evoked by the rising bubble.Furthermore,the influence of the bubble contact angle on the boiling heat-transfer performance is investigated.It is confirmed that the bubble departure diameter increases with the increase of the contact angle,meanwhile,the average wall temperature decreases with the increase of the contact angle. 展开更多
关键词 nucleate BOILING thermal-hydrodynamic coupling simulation MICROLAYER EVAPORATION contact angle wall temperature distribution
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Comments on "Reexamination of Correlations for Nucleate Site Distribution on Boiling Surface by Fractal Theory 被引量:2
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作者 BomingYU 《Journal of Thermal Science》 SCIE EI CAS CSCD 2002年第4期383-384,共2页
In recently published paper by Yang Chunxin[1], I reexamined the paper. On page 128, the paper 'pointed out that the size and spatial distribution density of nucleation sites presented on real boiling surface can ... In recently published paper by Yang Chunxin[1], I reexamined the paper. On page 128, the paper 'pointed out that the size and spatial distribution density of nucleation sites presented on real boiling surface can be described by the normalized fractal distribution function, and the physical meaning of parameters involved in some experimental correlations proposed by early investigations are identified according to fractal distribution'. However, the definition on fractal dimension given by Yang[1] is highly questionable, and the results obtained by Yang are contradictory to the basic fractal theory. Here are my comments: 展开更多
关键词 Comments on Reexamination of Correlations for nucleate Site Distribution on Boiling Surface by Fractal Theory SITE
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Heat Transfer Enhancement Due to Marangoni Flow Around Moving Bubbles During Nucleate Boiling 被引量:1
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作者 柯道友 王浩 彭晓峰 《Tsinghua Science and Technology》 SCIE EI CAS 2006年第5期523-532,共10页
Nucleate boiling is a very efficient method for generating high heat transfer rates from solid surfaces; however, the fundamental physical mechanisms governing nucleate boiling heat transfer are not well understood. T... Nucleate boiling is a very efficient method for generating high heat transfer rates from solid surfaces; however, the fundamental physical mechanisms governing nucleate boiling heat transfer are not well understood. The heat transfer mechanisms around stationary and moving bubbles on very thin microwires were analyzed numerically to evaluate the effect of the bubble motion on the heat transfer from the wire surface. The numerical analysis accurately models the experimentally observed bubble movement and fluid velocities. The analytical model includes the effects of the Marangoni flow around the bubble and the evaporation and condensation within the bubble. The analysis shows that the heat transfer was significantly enhanced by the Marangoni flow around the outside of the bubble which transfers at least twice as much en- ergy from the wire as the heat transfer directly from the wire to the bubble. The enhanced heat transfer due to the Marangoni flow was evident for both stationary and moving bubbles. The moving bubbles also created a wake that further enhanced the heat transfer from the wire. Since the Marangoni number for water is greater than for ethanol for the same conditions, the Marangoni flow and, hence, the bubble velocities are predicted to be greater in water than in ethanol. 展开更多
关键词 nucleate boiling Marangoni flow vapor bubbles heat transfer enhancement
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Onset of Nucleate Boiling in Natural Circulation Systems Predicted Using the Second Stir Theory 被引量:1
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作者 周涛 杨瑞昌 +2 位作者 李臻洋 张明 刘梦影 《Tsinghua Science and Technology》 SCIE EI CAS 2010年第4期441-446,共6页
Experimental data and calculated results for the onset of nucleate boiling (ONB) in natural circula- tion systems show that for the same operating conditions, the equilibrium vapor quality for ONB in natural circula... Experimental data and calculated results for the onset of nucleate boiling (ONB) in natural circula- tion systems show that for the same operating conditions, the equilibrium vapor quality for ONB in natural circulation is lower than for forced convections. The differences can be explained using second stir theory. The weak vortices and small stir energy in natural circulation systems result in nucleate boiling occurring earlier than in forced convection systems. In natural circulation systems high mass flow rates are accompa- nied by large kinetic energies and large stir energies, which enables changes in the directions of flow eddies and energy transport. The equilibrium vapor qualities at ONB are then higher at higher mass flow rates. The influence of other flow parameters on ONB can be evaluated by the relationships between these flow pa- rameters and the mass flow rate. The same values can lead to different results due to different eddy direc- tions. This indicates that the quantitative comparability in mathematics cannot be considered as only scien- tific standard. The second stir theory offers a new visual angle for researches on natural circulation. 展开更多
关键词 natural circulation onset of nucleate boiling (ONB) second stir theory BOILING direction
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Effect of Pore Size on the Nucleate Pool Boiling of Structured Enhanced Tubes 被引量:1
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作者 Nae-HyunKim Jong-WonKim 《Journal of Thermal Science》 SCIE EI CAS CSCD 2000年第3期230-235,共6页
In this study, pool boiling test results are provided for the structured enhanced tubes having pores with connecting gaps. The surface geometly of the present tube is similar to that of Turbo-B. Three tubes with diffe... In this study, pool boiling test results are provided for the structured enhanced tubes having pores with connecting gaps. The surface geometly of the present tube is similar to that of Turbo-B. Three tubes with different pore size (0.20 mm, 0.23 mm and 0.27 mm) were manufactured and tested using R-11, R-123 and R-134a. The pore size which yields the maximum heat transfer coefficient varied depending on the refrigerant. For R-134a, the maximum heat transfer coefficient was obtained for the tube having 0.27 nun pore size. For R-11 and R- 123, the optimum pore size was 0.23 mm. One novel feature of the present tubes is that their boiling curves do not show a cross-over characteristic, which existing pored tubes do. The connecting gaps of the present tube are believed to serve an additional route for the liquid supply and delay the dry-out of the tunnel. The present tubes yield the heat transfer coefficients approximately equal to those of the existing pored enhanced tubes. At the heat flux 40 kW/m2 and saturation temperature 4.4° C, the heat transfer coefficients of the present tubes are 6.5 times larger for R-11, 6.0 times larger for R-123 and 5.0 times larger for R-134a than that of the smooth tube 展开更多
关键词 structured enhanced tube PORE GAP nucleate pool boiling R-11 R-123 R-134a.
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Sn nucleation and growth from Sn(II)dissolved in ethylene glycol:Electrochemical behavior and temperature effect
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作者 Kiem Van DO Hieu Van NGUYEN Tu Manh LE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第8期2714-2732,共19页
Thermodynamic and kinetic aspects of Sn nucleation and growth processes onto a glassy carbon electrode from SnCl2·2H2O dissolved in ethylene glycol solutions were studied.Typical reduction and oxidation peaks obs... Thermodynamic and kinetic aspects of Sn nucleation and growth processes onto a glassy carbon electrode from SnCl2·2H2O dissolved in ethylene glycol solutions were studied.Typical reduction and oxidation peaks observed in voltammograms have demonstrated the capability of ethylene glycol solutions to electrodeposit Sn.The temperature-dependence of diffusion coefficient values derived from potentiodynamic and potentiostatic studies helped to determine and validate estimations of the activation energy for Sn(II)bulk diffusion.Chronoamperometric results have identified that,the suitable model to describe the early stage of Sn electrodeposition could be composed of Sn three-dimensional nucleation and diffusion-controlled growth and water reduction contributions,which was duly validated by theoretical and experimental approaches.From the model,typical kinetic parameters such as the nucleation frequency of Sn(A),number density of Sn nuclei(N_(0)),and diffusion coefficient of Sn(II)ions(D),were determined.The presence of Sn nuclei with excellent quality and their structures were verified using SEM,EDX,and XRD techniques. 展开更多
关键词 SN NUCLEATION growth ethylene glycol nucleation kinetics ELECTRODEPOSITION
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Na_(3)P interphase reduces Na nucleation energy enabling stable anode-less sodium metal batteries
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作者 Haizhao Yang Haifeng Lv +8 位作者 En Zhou Xiaohao Ji Chunnian Chen Haolei Yu Zhaowei Sun Dawei Zhang Hongchang Jin Xianghua Kong Hengxing Ji 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第9期448-455,共8页
Sodium metal batteries(SMBs)are rising as viable alternatives to lithium-ion systems due to their superior energy density and sodium's relative abundance.However,SMBs face significant impediments,particularly the ... Sodium metal batteries(SMBs)are rising as viable alternatives to lithium-ion systems due to their superior energy density and sodium's relative abundance.However,SMBs face significant impediments,particularly the exceedingly high negative-to-positive capacity ratios(N/P ratios)which severely encumber energy density and hinder their practical application.Herein,a novel nucleophilic Na_(3)P interphase on aluminum foil has been designed to significantly lower the nucleation energy barrier for sodium atom deposition,resulting in a remarkable reduction of nucleation overpotential and efficient mitigation of dendritic growth at high sodium deposition of 5 mA h cm^(−2).The interphase promotes stable cycling in anode-less SMB configurations with a low N/P ratio of 1.4 and high cathode mass loading of 11.5 mg cm^(−2),and demonstrates a substantial increase in high capacity retention of 92.4%after 500 cycles even under 1 C rate condition.This innovation signifies a promising leap forward in the development of high-energy-density,anode-less SMBs,offering a potential solution to the longstanding issues of cycle stability and energy efficiency. 展开更多
关键词 Anode-less Phosphorus anode Nucleation buffer layer Sodium metal Dendrite-free
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Biomineralization and mineralization using microfluidics:A comparison study
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作者 Yang Xiao Xiang He +3 位作者 Guoliang Ma Chang Zhao Jian Chu Hanlong Liu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第2期661-669,共9页
Biomineralization through microbial process has attracted great attention in the field of geotechnical engineering due to its ability to bind granular materials,clog pores,and seal fractures.Although minerals formed b... Biomineralization through microbial process has attracted great attention in the field of geotechnical engineering due to its ability to bind granular materials,clog pores,and seal fractures.Although minerals formed by biomineralization are generally the same as that by mineralization,their mechanical behaviors show a significant discrepancy.This study aims to figure out the differences between biomineralization and mineralization processes by visualizing and tracking the formation of minerals using microfluidics.Both biomineralization and mineralization processes occurred in the Y-shaped sandcontaining microchip that mimics the underground sand layers.Images from different areas in the reaction microchannel of microchips were captured to directly compare the distribution of minerals.Crystal size and numbers from different reaction times were measured to quantify the differences between biomineralization and mineralization processes in terms of crystal kinetics.Results showed that the crystals were precipitated in a faster and more uncontrollable manner in the mineralization process than that in the biomineralization process,given that those two processes presented similar precipitation stages.In addition,a more heterogeneous distribution of crystals was observed during the biomineralization process.The precipitation behaviors were further explained by the classical nucleation crystal growth theory.The present microfluidic tests could advance the understanding of biomineralization and provide new insight into the optimization of biocementation technology. 展开更多
关键词 Microbially induced carbonate precipitation (MICP) Biocementation CRYSTAL Calcium carbonate NUCLEATION
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Description of martensitic transformation kinetics in Fe-C-X(X = Ni,Cr,Mn,Si) system by a modified model
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作者 Xiyuan Geng Hongcan Chen +3 位作者 Jingjing Wang Yu Zhang Qun Luo Qian Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第5期1026-1036,共11页
Controlling the content of athermal martensite and retained austenite is important to improving the mechanical properties of high-strength steels,but a mechanism for the accurate description of martensitic transformat... Controlling the content of athermal martensite and retained austenite is important to improving the mechanical properties of high-strength steels,but a mechanism for the accurate description of martensitic transformation during the cooling process must be addressed.At present,frequently used semi-empirical kinetics models suffer from huge errors at the beginning of transformation,and most of them fail to exhibit the sigmoidal shape characteristic of transformation curves.To describe the martensitic transformation process accurately,based on the Magee model,we introduced the changes in the nucleation activation energy of martensite with temperature,which led to the varying nucleation rates of this model during martensitic transformation.According to the calculation results,the relative error of the modified model for the martensitic transformation kinetics curves of Fe-C-X(X = Ni,Cr,Mn,Si) alloys reached 9.5% compared with those measured via the thermal expansion method.The relative error was approximately reduced by two-thirds compared with that of the Magee model.The incorporation of nucleation activation energy into the kinetics model contributes to the improvement of its precision. 展开更多
关键词 Fe-C-X system martensitic transformation kinetics curve semi-empirical model nucleation activation energy
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