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本文给出了非均匀浓度场蒸汽—不凝性气体物系沿竖壁作膜状凝结放热的数学模型及其积分解,并对R-113-空气混合蒸汽在准静态空间作膜状凝结放热规律进行了数值分析,获得了凝结液膜厚度、蒸汽—空气扩散层厚度、气液界面温度和局部放热量等沿壁面高度的分布变化以及不凝性气体的浓度梯度对凝结放热过程的影响规律。按模型理论分析和计算条件,作者利用天津大学凝结放热试验台,模拟了一种常见的非均匀浓度场(R-113-空气),进行了膜状凝结放热实验,其结果与理论解析相比较,具有良好的一致性。
In this paper, a mathematical model of the exothermic condensation of vapor-condensable gases along the vertical walls of non-uniform concentration field and its integral solution are presented. The R-113-air mixed vapor The results show that the distribution of the thickness of the condensate film, the thickness of the vapor-air diffusion layer, the temperature distribution of the gas-liquid interface and the local heat release along the wall and the concentration gradient of the non-condensable gas have significant influence on the process of the condensation and exothermic process The law of influence. According to the theoretical analysis and calculation conditions of the model, the authors used a coagulation and exothermic test bed of Tianjin University to simulate a common heterogeneous concentration field (R-113-air) and carried out the film-like condensation and exothermic experiment. The results and theoretical analysis In comparison, with good consistency.