蓄热调温织物低温防护过程的数值模拟

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%。

Numerical simulation of low temperature protection process for heat storage fabrics

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%.