Three Dimensional Numerical Simulation of Convection-Condensation of Vapor with High Concentration Air in Tube with Inserts

详细信息    查看全文

• 作者：Yongzhang CUI ; Maocheng TIAN ; Linhua ZHANG ; Guangpeng LI ; Jianbin ZHU
• 关键词：condensation model ; numerical simulation ; transition flow
• 刊名：Chinese Journal of Chemical Engineering
• 出版年：2012
• 出版时间：August, 2012
• 年：2012
• 卷：20
• 期：4
• 页码：686-692
• 全文大小：200 K

文摘

A three-dimensional numerical model is presented for studying the convection-condensation of mixture with vapor in a tube with edgefold-twisted-tape inserts under transition flow. According to the diffusion layer theory and laminar species transport, a condensation model with user defined function is proposed and compared with heat and mass transfer analogy and experimental test. With the condensation model, the influences of gap width and operating parameters on thermal-hydrodynamics performance are simulated. As the gap width increases, convection and condensation heat transfer increase initially and then decrease, while convection heat transfer increases sharply and then decreases slightly. Increasing vapor fraction has a significant effect on condensation heat transfer but it has little effect on convective heat transfer. With the increase of inner wall temperature both convection and condensation heat transfer all decrease and the ratio of condensation to total heat decrease dramatically. Increases inlet temperature mainly affects convection heat transfer.