Behavior of Condensate and Heat Transfer on a Rotary Horizontal Tube under Dropwise Condensation

在滴状冷凝换热中，冷凝表面上的冷凝水会产生两种显著的效应，即扫掠效应和覆盖效应。本文从理论和实验两方面研究了冷凝水在旋转冷凝管上的行为与换热之间的关系。冷凝液在旋转管内的行为极其复杂。在此基础上，提出了计算冷凝液滴行为的基本模型，并估算了冷凝液滴的扫掠和遮盖对换热的影响。结果表明，随着旋转次数的增加，冷凝管的扫掠作用增大，遮盖作用减小。因此，通过对滴状冷凝条件下旋转管内强化换热的研究，显示了强化换热的可能性。

In dropwise condensation heat transfer,it is known that condensate on a condensing surface cause two significant effects,i.e., sweeping and covering effects. In this study, the correlation between the behavior of condensate and the heat transfer on a rotary condensing tube was investigated theoretically and experimentally. The behavior of condensate on the rotary tube was extremely complex. And thus, the authors proposed the essential model for calculating the behavior of condensing drops and estimated the sweeping and covering effects on the heat transfer. It was found that, in rotating a condensing tube, a sweeping action was increased and covering action was decreased with a rotation number. Therefore, the possibility of the enhancement of the heat transfer was shown by this investigation on the rotary tube under dropwise condensation.