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

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...

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Bibliographic Details
Published inChinese journal of chemical engineering Vol. 20; no. 4; pp. 686 - 692
Main Author 崔永章 田茂诚 张林华 李广鹏 朱建宾
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.08.2012
Subjects
Computer simulation
condensation model
Condensing
Convection
Heat transfer
Inserts
Mass transfer
Mathematical models
numerical simulation
Three dimensional
transition flow
Tubes
三维数值模拟
冷凝传热
动力学性能
对流换热
数值模型
水汽
浓度
空气
condensation model
transition flow
numerical simulation
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Summary: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 op-erating 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 condensa-tion heat transfer all decrease and the ratio of condensation to total heat decrease dramatically.Increases inlet tem-perature mainly affects convection heat transfer.
Bibliography:CUI Yongzhang,TIAN Maocheng,ZHANG Linhua,LI Guangpeng and ZHU Jianbin 1 Key Laboratory of Building Energy Conservation Technique of Shandong Province,School of Thermal Engineer-ing,Shandong Jianzhu University,Jinan 250101,China 2 School of Energy ＆ Power Engineering,Shandong University,Jinan 250061,China
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 op-erating 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 condensa-tion heat transfer all decrease and the ratio of condensation to total heat decrease dramatically.Increases inlet tem-perature mainly affects convection heat transfer.
condensation model; numerical simulation; transition flow
11-3270/TQ
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1004-9541
2210-321X
DOI:10.1016/S1004-9541(11)60236-X