【摘要】 针对液固界面相互作用对滴状冷凝传热的影响,以Rose滴状冷凝传热模型为基础,考虑接触角、脱落直径对冷凝传热的影响,对滴状冷凝过程中液滴空间序列上的构象,作时间序列上的重构,建立了包含液固界面效应的滴状冷凝传热模型.模型计算结果表明液固表面自由能差越大、接触角滞后越小则越有利于冷凝传热.为滴状冷凝文献数据间存在差异的原因提供了一个新的解释,即液固界面效应的影响.模型可计算得到在不同界面条件下的不同传热结果,模型计算结果与Rose实验值以及本文滴状冷凝传热实验较为吻合.更多还原

【Abstract】 Dropwise condensation heat transfer performance depends on not only the condensing conditions, but also the interfacial interaction between liquid and solid. Compared to the well-established Rose’s model, a new model of dropwise condensation heat transfer was proposed by considering the interfacial interaction between liquid and solid, and was established by rebuilding the space conformation of drop distribution into time conformation.The simulation results indicated that heat transfer coefficient increased with increasing surface free energy difference and decreasing contact angle hysteresis. A larger contact angle and the smaller departure drop size resulted in higher heat transfer coefficient. Different interfacial effects gave rise to different heat transfer curves. For the identical solid-liquid-vapor system, the simulation results agreed well with the present experimental data and those reported by Rose.The disagreement between experimental results in literature might be well explained with the concept of the present paper.更多还原