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research-article

Developing Convective Heat Transfer in Multiport Microchannel Flat Tubes

[+] Author and Article Information
Qin Sun

The College of Architecture and Civil Engineering, Beijing University of Technology, No. 100 Pingleyuan, Chaoyang District, Beijing 100124, China
873877248@qq.com

Yanhua Diao

The College of Architecture and Civil Engineering, Beijing University of Technology, No. 100 Pingleyuan, Chaoyang District, Beijing 100124, China
diaoyanhua@bjut.edu.cn

Yaohua Zhao

The College of Architecture and Civil Engineering, Beijing University of Technology, No. 100 Pingleyuan, Chaoyang District, Beijing 100124, China
yhzhao29@126.com

Sheng Tang

The College of Architecture and Civil Engineering, Beijing University of Technology, No. 100 Pingleyuan, Chaoyang District, Beijing 100124, China
670747274@qq.com

Ji Zhang

The College of Architecture and Civil Engineering, Beijing University of Technology, No. 100 Pingleyuan, Chaoyang District, Beijing 100124, China
264800318@qq.com

Zeyu Wang

The College of Architecture and Civil Engineering, Beijing University of Technology, No. 100 Pingleyuan, Chaoyang District, Beijing 100124, China
437537192@qq.com

1Corresponding author.

ASME doi:10.1115/1.4042810 History: Received January 19, 2017; Revised January 29, 2019

Abstract

An experimental investigation of fluid flow friction and heat transfer coefficient in simultaneously developing flow through a multiport microchannel flat tube (MMFT) was presented. The cross-sectional geometries of five tubes were rectangular with hydraulic diameters of 0.8 mm to 1.33 mm and aspect ratio of 0.44 to 0.94. The working fluid was water, and the Reynolds number was in the range 150-4500. The experiment result showed that friction factor was successfully predicted by classical correlation in laminar regime, whereas the laminar-turbulent transition in the developing flow was not as obvious as in the completely developed flow. The greater aspect ratio produced stronger heat transfer capacity in the developing flow, although the effect of the aspect ratio decreased at increased Reynolds numbers for heat transfer characteristics. Moreover, the scale effect improved the heat transfer performance of MMFTs, especially at high Reynolds numbers.

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