1. 重庆大学能源与动力工程学院
2. 西安热工研究院有限公司
纸质出版:2022
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邓欣欣, 杨利, 吴闯, 等. R32/R1234ze(E)界面冷凝的分子动力学研究[J]. 西安交通大学学报, 2022,(3):173-179.
采用分子动力学模拟方法研究了R32/R1234ze(E)混合工质在金属壁面上的冷凝行为,分析了5种质量分数对混合工质传热性能和冷凝行为的影响机制,从传热热阻、空间分布和分子间作用力的角度,对比了不同质量分数的混合工质冷凝行为。结果表明:在5种不同R32质量分数的混合工质体系中,混合工质的冷凝率随着R32含量的降低而降低;在模拟初期的混合工质液膜中,R32的冷凝量大于R1234ze(E)的冷凝量;在相同质量的情况下,R32含量越高的体系,其凝结时放出的热量更大;在固液界面处,纯R1234ze(E)体系的密度峰值最大,固体表面对R1234ze(E)分子的作用力强于R32;混合工质中R1234ze(E)含量越高的体系,其固液界面的温度跳跃越小,但气液相界面的温度跳跃越大。热阻分析的结果表明,总热阻随着混合工质中R32含量的降低而增加,其中不同质量比体系中的固液界面热阻随R32含量的降低而降低,而液体热阻和气液相界面的热阻则随着混合工质中R32含量的减小而增大,气液相界面热阻占总热阻的主要部分是总热阻有较大差异的主要原因。
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