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Research Papers: Micro/Nanoscale Heat Transfer

Developing Convective Heat Transfer in Multiport Microchannel Flat Tubes

[+] Author and Article Information
Qin Sun, Yanhua Diao, Sheng Tang, Ji Zhang, Zeyu Wang

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

Yaohua Zhao

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

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 19, 2017; final manuscript received January 29, 2019; published online April 16, 2019. Editor: Portonovo S. Ayyaswamy.

J. Heat Transfer 141(6), 062401 (Apr 16, 2019) (8 pages) Paper No: HT-17-1032; doi: 10.1115/1.4042810 History: Received January 19, 2017; Revised January 29, 2019

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 0.8–1.33 mm and aspect ratio of 0.44–0.94. 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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Figures

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Fig. 1

Schematic of the test facility

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Fig. 2

Schematic of the test section

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Fig. 3

SEM of the cross sections of the MMFT

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Fig. 5

Friction factor as a function of the Reynolds numbers for the five MMFTs

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Fig. 6

Nusselt number as a function of Reynolds numbers under different heat fluxes

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Fig. 7

Comparison of Nusselt number as a function of Reynolds numbers with correlations for sample 3

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Fig. 8

Nusselt number as a function of Reynolds numbers for the five MMFTs under constant heat flux

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Fig. 9

Comparison of Nusselt number for samples 2 and 3

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Fig. 10

Comparison of Nusselt number for samples 5 and 4

Tables

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