请登录 0 购物车
首页 图书 电子图书 期刊 参考文献及会议录 作者,编辑,审稿 A-Z 产品目录
Compact Heat Exchangers and Enhancement Technology for the Process Industries - 2003

ISBN 打印: 978-1-56700-195-2

EXPERIMENTAL VERIFICATION OF A NEW APPROACH FOR FILM CONDENSATION HEAT TRANSFER ENHANCEMENT OF ETHYLENE GLYCOL VAPOUR

Abstract

In order to investigate the effect of surface-free-energy difference of condensate and solid surface, defining as Δσ=σls, on the condensation pattern states and the heat transfer performance, two critical values of the surface-free-energy difference are proposed to classify the vapor condensation pattern states into film, mixing and perfect dropwise modes. Consequently, new condensation heat transfer enhancement mechanism in term of the surface-free-energy difference can be concluded.
The influence of free energy difference of solid surface and liquid on filmwise condensation heat transfer is studied by means of the ethylene glycol vapor condensation on surfaces of ion-implanted nitrogen surface, mechanical polishing surface and DLC surface on the substrates of copper and brass plates, respectively. The results obtained from the experiences are higher than the calculated results of classic Nusselt model, indicating that the specially treated surfaces with lower free energy takes an important role not only for promoting dropwise condensation mode, but also for enhancing the film condensation heat transfer.
首页 Begell Digital Portal Begell数据库 期刊 图书 电子图书 参考文献及会议录 作者,编辑,审稿 A-Z 产品目录 订购及政策 关于BegellHouse 联系我们 Language English 中文 Русский 日本語 Português Deutsch Français Español