蓄热调温织物低温防护过程的数值模拟
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摘要
为提升普通织物的低温抵抗性能,将具有蓄热调温功能的相变微胶囊涂覆至织物表面制得蓄热调温织物,通过Fluent软件对复合织物的低温防护过程进行模拟,在此基础上设置了蓄热调温织物的低温防护试验对模型的模拟精度进行检验,并模拟探究了微胶囊的相变潜热以及其在织物中所占的体积分数对蓄热调温织物低温防护性能的影响。结果表明:数值模拟结果可显示不同时间节点蓄热调温织物的温度场分布情况以及各区域的温度变化趋势,且试验结果与模拟结果的误差小于8. 64%,该模拟结果可较为准确地再现蓄热调温织物的低温防护过程;当微胶囊的相变潜热由50 J/g增加至200 J/g时,织物的低温防护时间延长了70. 1%;当微胶囊的质量分数由1%增加至5%时,织物的低温防护时间由214 s延长至388 s,同比提升了81. 3%。
In order to improve the low temperature resistance of ordinary fabric,a phase change microcapsule with heat storage and temperature control function was coated to the surface to produce heat storage temperature fabric. The low temperature protection process of composite fabric was simulated by Fluent software. Based on this,the simulation accuracy of the model was tested by low temperature protection experiment. In addition,the influence of phase change latent heat and volume fraction of microcapsules on the low temperature protective properties of thermal storage fabrics was investigated. The numerical simulation results show the temperature field distribution and the temperature variation trend of the temperature distribution in different time nodes. The error of the test results and simulation results is less than 8. 64%, which indicates that the simulation results can be adopted to restore the low temperature protection process of the heat storage fabric. The results show that when the phase change latent heat of microcapsules increases from 50 J/g to 200 J/g,the low temperature protection time of the fabric is prolonged by 70. 1%. When the volume fraction of the microcapsule increases from 1% to 5%,the low temperature protection time of the fabric increases from 214 s to 388 s,prolonged by 81. 3%.
In order to improve the low temperature resistance of ordinary fabric,a phase change microcapsule with heat storage and temperature control function was coated to the surface to produce heat storage temperature fabric. The low temperature protection process of composite fabric was simulated by Fluent software. Based on this,the simulation accuracy of the model was tested by low temperature protection experiment. In addition,the influence of phase change latent heat and volume fraction of microcapsules on the low temperature protective properties of thermal storage fabrics was investigated. The numerical simulation results show the temperature field distribution and the temperature variation trend of the temperature distribution in different time nodes. The error of the test results and simulation results is less than 8. 64%, which indicates that the simulation results can be adopted to restore the low temperature protection process of the heat storage fabric. The results show that when the phase change latent heat of microcapsules increases from 50 J/g to 200 J/g,the low temperature protection time of the fabric is prolonged by 70. 1%. When the volume fraction of the microcapsule increases from 1% to 5%,the low temperature protection time of the fabric increases from 214 s to 388 s,prolonged by 81. 3%.
引文
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[2]张涛,李宏伟,王建明,等.端羟基聚丁二烯聚氨酯相变微胶囊的制备及其性能[J].纺织学报,2018,39(3):86-91.ZHANG Tao,LI Hongwei,WANG Jianming,et al.Preparation and properties of hydroxyl-terminated polybutadiene phase-change polyurethane microcapsule[J].Journal of Textile Research,2018,39(3):86-91.
[3]王瑞,孙艳丽,刘星,等.碳纳米管改性相变微胶囊的力学与热学性能[J].纺织学报,2018,39(2):119-125.WANG Rui,SUN Yanli,LIU Xing,et al.Mechanical and thermal properties of phase change microcapsules modified with carbon nanotubes[J].Journal of Textile Research,2018,39(2):86-91.
[4]王瑞,陈旭,吴炳洋,等.正二十烷/海藻酸钠微胶囊的锐孔-凝固浴法制备[J].纺织学报,2016,37(7):82-87.WANG Rui,CHEN Xu,WU Bingyang,et al.Preparation of n-eicosane/sodium alginates phase change microcapsules by hole-coagulation bath[J].Journal of Textile Research,2016,37(7):82-87.
[5]姚鹏成,夏鑫.聚乳酸包覆相变材料复合织物的制备及其性能[J].纺织学报,2017,38(1):67-72.YAO Pengcheng,XIA Xin.Preparation and properties of polylactic acid coated phase change material composite fabric[J].Journal of Textile Research,2017,38(1):67-72.
[6]孙艳丽,王瑞,刘星,等.轻薄低温防护手套用复合织物的制备及其性能[J].纺织学报,2017,38(5):58-63.SUN Yanli,WANG Rui,LIU Xing,et al.Preparation and properties of composite fabric for light-weight low temperature protective gloves[J].Journal of Textile Research,2017,38(5):58-63.
[7]YANG Y,KUANG J,WANG H,et al.Enhancement in thermal property of phase change microcapsules with modified silicon nitride for solar energy[J].Solar Energy Materials and Solar Cells,2016,151:89-95.
[8]HUANG X,ALVA G,JIA Y,et al.Morphological characterization and applications of phase change materials in thermal energy storage:a review[J].Renewable and Sustainable Energy Reviews,2017,72:128-145.
[9]GENG X,LI W,WANG Y,et al.Reversible thermochromic microencapsulated phase change materials for thermal energy storage application in thermal protective clothing[J].Applied Energy,2018,217:281-294.
[10]李凤志,吴成云,李毅.附加相变微胶囊多孔织物热湿传递模型研究[J].大连理工大学学报,2008(2):162-167.LI Fengzhi,WU Chengyun,LI Yi.A model of heat and moisture transfer in porous textiles with microencapsulated phase change materials[J].Journal of Dalian University of Technology,2008(2):162-167.
[11]LI Fengzhi,LI Yi.A computational analysis for effects of fibre hygroscopicity on heat and moisture transfer in textiles with PCM microcapsules[J].Modelling and Simulation in Materials Science and Engineering,2007,15(3):223.
[12]SAFAVI A,AMANI-TEHRAN M,LATIFI M.A new approach to theoretical modeling of heat transfer through fibrous layers incorporated with microcapsules of phase change materials[J].Thermochimica Acta,2015,604:24-32.
[13]吴乐凡,向忠,黄晓东,等.含芯棒水平换热管冷凝传热数值模拟[J].纺织学报,2017,38(10):118-123.WU Lefan,XIANG Zhong,HUANG Xiaodong,et al.Numerical simulation of condensation heat transfer in mandrel-containing horizontal heat exchanger tube[J].Journal of Textile Research,2017,38(10):118-123.
[14]吴佳佳,唐虹.应用ABAQUS的织物热传递有限元分析[J].纺织学报,2016,37(9):37-41.WU Jiajia,TANG Hong.ABAQUS based finite element analysis of heat transfer through woven fabrics[J].Journal of Textile Research,2016,37(9):37-41.
[15]袁龙超,李新荣,郭臻,等.喷气涡流纺喷嘴结构对流场影响的研究进展[J].纺织学报,2018,39(1):169-178.YUAN Longchao,LI Xinrong,GUO Zhen,et al.Research progress in influence of vortex spinning nozzle on flow field[J].Journal of Textile Research,2018,39(1):169-178.