摘要
针对制冷剂HCFC-141b(一氟二氯乙烷)水合物生成诱导时间长、随机性高的问题,试验研究了碳化钛(TiC)纳米粒子和表面活性剂十六烷基三甲基溴化铵(CTAB)复配形成的纳米流体对水合物生成的协同促进作用,并通过试验数据计算诱导时间标准差、水合物蓄冷量。结果表明,CTAB具有良好的分散性与稳定性,复配体系下纳米流体的促进效果进一步增强,但随着TiC粒径和添加浓度的增大,促进程度均呈现先增强后减弱的特点。TiC纳米粒子的最佳粒径为40 nm,相较于50 nm和30 nm,平均诱导时间分别缩短22.7%和34.8%;最佳添加浓度为120 ppm,平均诱导时间缩短至53.2 min,标准差降低至8.4,最高蓄冷量可达269.9 kJ/kg。碳化物纳米粒子的高表面能和吸附作用为制冷剂水合物的生成提供了大量成核位点,而布朗运动和高导热性可增强传热与传质。
In order to solve the problems of long induction time and high randomness in the formation of refrigerant HCFC-141b(monofluorodi chloroethane)hydrate,the synergistic promotion effect of nanofluid systems composed of titanium carbide nanoparticles and surfactant hexadecyl trimethyl ammonium bromide(CTAB)onhydrate formation was experimentally studied.Standard deviation of induction time and hydrate cold storage capacity were calculated based on experimental data.The results show that CTAB has preferable dispersibility and stability,and the promotion effect of nanofluids in the composite system is further enhanced.However,with the increase of TiC particle size and additive concentration,the promotion degree shows a characteristic of firstly increasing and then weakening.Optimal size of TiC nanoparticle is 40 nm,and the average induction time is shortened by 22.7%and 34.8%compared to 50 nm and 30 nm,respectively;optimal additive concentration is 120 ppm,the induction time is shortened to 53.2 min,the standard deviation is reduced to 8.4,and the maximum cold storage capacity can reach as high as 269.9 kJ/kg.The high surface energy and adsorption effect of carbide nanoparticles provide a large number of nucleation sites for the formation of refrigerant hydrates,while the Brownian motion and high thermal conductivity can promote both heat and mass transfer.
作者
胡鹏飞
李娟
孙志高
Hu Pengfei;Li Juan;Sun Zhigao(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China)
出处
《低温与超导》
CAS
北大核心
2024年第1期65-72,共8页
Cryogenics and Superconductivity
基金
江苏省高校自然科学研究重大项目(16KJA480001)
江苏省自然科学基金项目(BK20170382)
苏州市科技计划项目(SS202149)资助。
