Flow mechanism and heat transfer enhancement in longitudinal-flow tube bundle of shell-and-tube heat exchanger  

作　　者：Wei Liu  ZhiChun Liu  YingShuang Wang SuYi Huang 

机构地区：[1] School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

出　　处：《Science China(Technological Sciences)》2009年第10期2952-2959,共8页中国科学（技术科学英文版）

基　　金：Supported by the National Basic Research Program of China ("973" Project) (Grant No. 2007CB206903);the National Natural Science Foundation of China (Grant No. 50721005)

摘　　要：The flow disturbance and heat transfer mechanism in the tube bundle of rod baffle shell-and-tube heat exchanger were analyzed, on the basis of which and combined with the concept of heat transfer enhancement in the core flow, a new type of shell-and-tube heat exchanger with combination of rod and van type spoiler was designed. Corresponding mathematical and physical models on the shell side about the new type heat exchanger were established, and fluid flow and heat transfer characteristics were numerically analyzed. The simulation results showed that heat transfer coefficient of the new type of heat exchanger approximated to that of rod baffle heat exchanger, but flow pressure drop was much less than the latter, indicating that comprehensive performance of the former is superior to that of the latter. Compared with rod baffle heat exchanger, heat transfer coefficient of the heat exchanger under investigation is higher under same pressure drop, especially under the high Reynolds numbers.The flow disturbance and heat transfer mechanism in the tube bundle of rod baffle shell-and-tube heat exchanger were analyzed, on the basis of which and combined with the concept of heat transfer enhancement in the core flow, a new type of shell-and-tube heat exchanger with combination of rod and van type spoiler was designed. Corresponding mathematical and physical models on the shell side about the new type heat exchanger were established, and fluid flow and heat transfer characteristics were numerically analyzed. The simulation results showed that heat transfer coefficient of the new type of heat exchanger approximated to that of rod baffle heat exchanger, but flow pressure drop was much less than the latter, indicating that comprehensive performance of the former is superior to that of the latter. Compared with rod baffle heat exchanger, heat transfer coefficient of the heat exchanger under investigation is higher under same pressure drop, especially under the high Reynolds numbers.

关 键 词：shell-and-tube HEAT EXCHANGER tube BUNDLE rod BAFFLE vane-type SPOILER core FLOW HEAT transfer enhancement 

分 类 号：TQ021[化学工程]