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为研究相变微胶囊对真空闪蒸过程的影响规律,对相变微胶囊在真空中的放热过程进行数学建模,并采用Ligthill方法对模型求解,分析了相界面位置、热流量、蒸发速度、蒸发量和时间的关系,并对3种相变材料Ba(OH)_2·8H_2O、Na CH_3COO·3H_2O和石蜡进行了放热过程对比分析。结果表明,相变微胶囊在真空环境中石蜡放热速度最快,约为38 ms。热流量Ba(OH)_2·8H_2O最大,约为60 m W。通过蒸发速度和产水量分析,加入Ba(OH)_2·8H_2O相变微胶囊后,放热时间由10 ms提高到67 ms,蒸发量提高84.5%。
In order to study the effect of phase change microcapsules on vacuum flashing process, the exothermic process of phase change microcapsules in vacuum was mathematically modeled and the model was solved by Ligthill method. The phase interface, heat flux, evaporation Velocity, evaporation and time. The phase transitions of Ba (OH) 2 · 8H 2 O, Na CH 3 COO · 3H 2 O and paraffin were compared and analyzed. The results show that phase change microcapsules in the vacuum environment, the fastest paraffin wax heat release, about 38 ms. The maximum heat flux Ba (OH) 2 · 8H 2 O is about 60 mW. Through the analysis of evaporation rate and water production, after adding Ba (OH) 2 · 8H2O phase-change microcapsules, the exothermic time increased from 10 ms to 67 ms, and the evaporation increased by 84.5%.