Abstract: Four kinds of modified copper surfaces Were obtained with ion-implantation technique. Fine dropwise condensation of steam could be obtained on these surfaces. The effect of steam temperature on dropwise condensation was studied experimentally. The results indicated that the heat transfer coefficient of dropwise condensation increased with the increase of steam temperature near atmospheric pressure. The properties of the condensing surface strongly affect the heat transfer of dropwise condensation. A discussion on the results was given from drop nucleation theory and surface energy effects.

摘要： <正>滴状冷凝作为一种高效传热方式,自从被人们发现以来,许多研究者在这一领域作了大量研究工作.早期的研究主要集中在实现滴状冷凝的方法上.随着对滴状冷凝现象认识的加深,人们逐渐加强了对滴状冷凝传热机理的研究,提出了许多观点来解释滴状冷凝高效传热的原因,其中主要有两种假说,一种是液膜破裂假说,另一种是固定成核中心假说.