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非饱和土的水气运动规律及其工程性质研究 被引量:80
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作者 陈正汉 谢定义 王永胜 《岩土工程学报》 EI CAS CSCD 北大核心 1993年第3期9-20,共12页
本文以压实黄土为对象,以各种改进的仪器设备为手段,在较大的湿度和密度范围内系统地研究了非饱和土的渗气性、渗水性、孔隙水压力和孔隙气压力在三轴不排水不排气剪切过程中的演化特性;用多种方法研究了非饱和土的吸力—密度—饱和度... 本文以压实黄土为对象,以各种改进的仪器设备为手段,在较大的湿度和密度范围内系统地研究了非饱和土的渗气性、渗水性、孔隙水压力和孔隙气压力在三轴不排水不排气剪切过程中的演化特性;用多种方法研究了非饱和土的吸力—密度—饱和度间的关系;在总结正反两方面经验的基础上,摸索出一套相应的测试方法. 展开更多
关键词 非饱和土 水气运动 工程性质
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单一非饱和土试样湿密状态变化时的渗透性试验研究
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作者 赵敏 徐雷 谢定义 《建筑技术开发》 2003年第9期17-18,共2页
基于非饱和土水气运动联合测试仪,通过加压增湿改变湿密状态测得的渗透系数与预制不同湿密状态的扰动样测得的渗透系数的比较可知,两者结果很相近,故为提高试验效率和试样利用率,可用一个试样来测定其渗透系数.
关键词 非饱和土水气运动联合测试仪 单一试样 湿密状态 渗透特性
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Evolution of Hydrodynamic Field, Oil-Gas Migration and Accumulation in Songliao Basin, China 被引量:4
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作者 楼章华 朱蓉 +3 位作者 金爱民 孙毛明 蔡希源 迟元林 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2004年第2期105-123,共19页
The oil-gas migration and accumulation in the Songliao Basin were analyzed in the view of fluid dynamics by the authors. The key point of fluid dynamics is hydrodynamics. Oil-gas migration and accumulation are related... The oil-gas migration and accumulation in the Songliao Basin were analyzed in the view of fluid dynamics by the authors. The key point of fluid dynamics is hydrodynamics. Oil-gas migration and accumulation are related closely with formation and evolution of hydrodynamic field. Based on abundant data, initial formation pressure and other parameters, such as water head were studied. They can be used to understand the present distribution of hydrodynamic field and its hydrochemical features. Generally, the hydrodynamic field in the basin is obviously asymmetrical. In its north and east part, there are the areas of centripetal flow caused by topographic relief when meteoric water permeate downwards. Its south part is an evaporation-concentration area. The central depression is an area of centrifugal flow driven by sediment compaction and its cross-formational flow area. Only at the basin margin and in the local uplifted and denudated area are the meteoric water permeating downwards areas. The centrifugal flow driven by sediment compaction is the main dynamic factor that induces oil-gas migration and accumulation and its formation period corresponding to the main stage of oil-gas migration and accumulation. Moreover, the evolution of hydrodynamic field has the cyclic property, which results in phased oil-gas migration by stages, and further dominates the terraced annular oil and gas distribution, concentric with their corresponding sags. 展开更多
关键词 Songliao Basin HYDRODYNAMICS oil-gas migration and accumulation
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Deviation of Carbon Dioxide-Water Gas-Liquid Balance from Thermodynamic Equilibrium in Turbulence h Experiment and Correlation 被引量:2
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作者 张珍稹 钱智 +2 位作者 徐联滨 吴彩艳 郭锴 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第7期770-775,共6页
The carbon dioxide-water system was used to investigate the flowing gas-liquid metastable state. The experiment was carded out in a constant volume vessel with a horizontal circulation pipe and a peristaltic pump forc... The carbon dioxide-water system was used to investigate the flowing gas-liquid metastable state. The experiment was carded out in a constant volume vessel with a horizontal circulation pipe and a peristaltic pump forced CO2 saturated water to flow. The temperature and pressure were recorded. The results showed that some CO2 escaped from the water in the flow process and the pressure increased, indicating that the gas-liquid equilibrium was broken. The amount of escaped CO2 varied with flow speed and reached a limit in a few minutes, entitled dy- namic equilibrium. Temperature and liquid movement played the same important role in breaking the phase equilib- rium. Under the experimental conditions, the ratio of the excessive carbon dioxide in the gas phase to its thermody- namic equilibrium amount in the liquid could achieve 15%. 展开更多
关键词 carbon dioxide TURBULENCE DESORPTION dynamic gas-liquid phase equilibrium
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Research on characteristics of water motion and influencing factors for the flexible air chamber jig body 被引量:1
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作者 Chen Yinghua Kuang Yali Li Haisheng 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第3期389-394,共6页
The air bag deformation data were obtained by high-speed dynamic videos experiments. Based on gas–liquid flow VOF model, dynamic mesh technique and deformation data, numerical simulations for different structure mode... The air bag deformation data were obtained by high-speed dynamic videos experiments. Based on gas–liquid flow VOF model, dynamic mesh technique and deformation data, numerical simulations for different structure models were achieved, and the law of water motion and influencing factors were analyzed.The results show that the flow in the length direction of the jig is smooth, and second pulsation appears in the separation time and forms the secondary separation. The installation position of screen and the number of air bags have a great influence on the uniformity of flow and velocity. The screen height cannot be too low to avoid forming the unstable flow. At the same time, the screen height cannot be too high, otherwise water velocity will be too small and was unable to provide enough power. At the height of 1.4m,velocity unevenness is minimum and the best uniform flow can be obtained. Compared with double air bags, there are the following features of single air bag: water flow is not smooth, the time achieving the maximum velocity is too long, maximum velocity is smaller, and overall effect is worse than double air bags. 展开更多
关键词 Flexible air chamber jig Water motion Numerical simulation Screen location Number of air bags
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Estimation of the Hydrodynamic Regime of the Water Movement under the Influence of the Atmospheric Processes in the Bering Sea and the Sea of Okhotsk
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作者 G.A. Vlasova 《Journal of Environmental Science and Engineering》 2011年第10期1276-1281,共6页
The given investigation presents the results of estimating the water circulation in the water area of the Bering Sea and the Sea of Okhotsks, considering the influence of various types of the atmospheric processes. To... The given investigation presents the results of estimating the water circulation in the water area of the Bering Sea and the Sea of Okhotsks, considering the influence of various types of the atmospheric processes. To solve the given problem it is used a hydrodynamic model calculating the integral functions of the flow from the surface to the bottom. By results of calculations, the maps of the integral water circulation were built for the following types of atmospheric circulation: "north-western" and "okhotsk-aleutian". In accordance with the performed calculations for the water area being studied, the hydrodynamic structures are distinguished both non-depending and depending on the type of the atmospheric circulation. The non-depending structures are characterized by the cyclonic activity in the Bering Sea and the Sea of Okhotsk in whole. Hydrodynamic structures depending on types of the atmospheric circulation have their peculiarities in the spatial-temporal distribution. 展开更多
关键词 Bering Sea the Sea of Okhotsk water and atmospheric circulation CYCLONES ANTICYCLONES vortices.
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The Effect of Micro Air Movement on the Heat and Moisture Characteristics of Building Constructions
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作者 A.W.M. (Jos) van Schijndel 《Journal of Civil Engineering and Architecture》 2010年第10期9-15,共7页
The research focuses on the effect of air movement through building constructions. Although the typical air movement inside building constructions is quite small (velocity is of order -10-5 m/s), this research shows... The research focuses on the effect of air movement through building constructions. Although the typical air movement inside building constructions is quite small (velocity is of order -10-5 m/s), this research shows the impact on the heat and moisture characteristics. The paper presents a case study on the modeling and simulation of 2D heat and moisture transport with and without air movement for a building construction using a state-of-art multiphysics FEM software tool. Most other heat and moisture related models don't include airflow or use a steady airflow through the construction during the simulation period. However, in this model, the wind induced pressure is dynamic and thus also the airflow through the construction is dynamic. For this particular case study, the results indicate that at the intemal surface, the vapor pressure is almost not influenced by both the 2D effect and the wind speed. The temperatures at the inner surface are mostly influenced by the 2D effect. Only at wind pressure differences above 30 Pa, the airflow has a significant effect. At the extemal surface, the temperatttres are not influenced by both the 2D effect and the wind speed. However, the vapor pressure seems to be quite dependent on the wind induced pressure. Overall it is concluded that air movement through building materials seems to have a significant impact on the heat and moisture characteristics. In order to verify this statement and validate the models, new in-depth experiments including air flow through materials are recommended. 展开更多
关键词 CONSTRUCTION HEAT MOISTURE TRANSFER air movement modeling.
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