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Journal of Enhanced Heat Transfer
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ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2018020367
pages 465-485

FLOW AND HEAT TRANSFER CHARACTERISTICS OF A FIN-AND-TUBE HEAT EXCHANGER WITH WAVY RIB INSERTS

Li Li
MOE Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Beijing 102206, China
Xiaoze Du
Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (North China Electric Power University), Ministry of Education, Beijing 102206, China; School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Lijun Yang
MOE Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Beijing 102206, China
Yongping Yang
MOE Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Beijing 102206, China
Gaosheng Wei
MOE Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Beijing 102206, China

RÉSUMÉ

Heat transfer is enhanced when the plain fins are redesigned into wavy fins with variable cross-sections along the flow stream. However, the increased pressure drop in the air side of the fin-and-tube heat exchangers leads to lower overall performance, which is a shortcoming in configuring the wavy fins. In the present study, inserted wavy ribs on the base of plain fins were proposed for the purpose of obtaining balance between enhanced heat transfer and increased pressure drop. The heat transfer performance and pressure drop were numerically investigated. The simulation results showed that the Nusselt numbers increased up to 40% for inserted wavy ribs on plain fins compared to the channel without the insert. The side effect of increased pressure drop was not significant, leading to the considerable overall performance of heat transfer. The various cross-sections formed by wavy inserts contribute to the disturbance of fluid flow. The heat transfer enhancement could be explained by the decrease in synergy angle between flow velocity and temperature gradient on the wavy surface. Additionally, the angle, number, and length of the wavy inserts are other factors leading to the contradiction between enhanced heat transfer and increased pressure drop.


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