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Technical Brief

Flow structure and heat transfer characteristics of a rectangular channel with pin fins and dimples with different shapes

[+] Author and Article Information
Lei Luo

National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China; School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China
leiluo@hit.edu.cn

Han Yan

School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China
hanyan_hit@outlook.com

Wei Du

School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China
hitdw9211@outlook.com

Songtao Wang

School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China
736899318@qq.com

changhai Li

Harbin Marine Boiler and Turbine Research Institute, Harbin 150078, China
782021791@qq.com

Xinghong Zhang

National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China
513569992@qq.com

1Corresponding author.

ASME doi:10.1115/1.4041598 History: Received March 30, 2018; Revised September 16, 2018

Abstract

In this study, numerical simulations are conducted to investigate the effects of pin fin and dimple shape on the flow structure and heat transfer characteristics in a rectangular channel. The studied shapes for dimple and pin fin are circular, spanwise-elliptical and streamwise-elliptical, respectively. The flow structure, friction factor and heat transfer performance are obtained and analyzed with Reynolds number ranging from 10,000 to 50,000. Channel with circular pin fin and dimple is chosen as the Baseline. Channels with spanwise-elliptical pin fins have the best heat transfer augmentation, while also accompanied with the largest friction factor. Spanwise-elliptical pin fin generates the strongest horseshoe vortex which is responsible for the best heat transfer augmentation. Besides, channels with streamwise-elliptical pin fins show the worst heat transfer augmentation and the smallest friction factors. Dimple plays an important role in improving the heat transfer. Spanwise-elliptical dimple yields the best heat transfer augmentation which is attributed to the strongest counter-rotating vortex, while streamwise-elliptical dimple shows the worst heat transfer enhancement.

Copyright (c) 2018 by ASME
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