Experimental Study of Developing Convective Heat Transfer in a Multiport Microchannel Flat Tube

ZHAO Yaohua; SUN Qin; DIAO Yanhua; TANG Sheng

doi:10.11936/bjutxb2016020031

Journal of Beijing University of Technology > 2017 > 43(5): 793-800. > DOI: 10.11936/bjutxb2016020031

ZHAO Yaohua, SUN Qin, DIAO Yanhua, TANG Sheng. Experimental Study of Developing Convective Heat Transfer in a Multiport Microchannel Flat Tube[J]. Journal of Beijing University of Technology, 2017, 43(5): 793-800. DOI: 10.11936/bjutxb2016020031

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Experimental Study of Developing Convective Heat Transfer in a Multiport Microchannel Flat Tube

College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China

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Received Date: February 25, 2016
Available Online: May 25, 2023

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Abstract

Abstract

In order to improve the heat dissipation of electronic devices,reduce the problem of lower devices performance and short working life which was caused by high temperature, the friction and heat transfer characteristics of single phase forced convection in developing region with high heat flux through a multiport microchannel flat tube (MMFT) were comparatively investigated by experiments. Furthermore the influence of heat transfer capability in MMFT with developing flow was evaluated by three aspects: single/double-side heating, different methods of eliminating thermal resistance and different heat flux. The hydraulic diameter of the tube was 1.09mm, aspect ratio was 0.85 and Reynolds number was in the range of 206~4553. The results indicate that friction factor obtained by experiment is in good agreement with the classical developing channel laminar flow theory. In addition to heat transfer, single-side heating is superior to double-side heating whereas the discrepancy reduces with the increase of Reynold number. Different thermal resistance has obvious effect on heat transfer. Brazing lowers the surface temperature of heating device 10℃ than thermally conductive silicone grease. When Re<1000, temperature dependent viscosity variation on the convective heat transfer are significant, however for high Reynold, various heat flux effects Nusselt number little.
- single phase flow,
- developing region,
- microchannel,
- heat transfer

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References (17)

References

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Experimental Study of Developing Convective Heat Transfer in a Multiport Microchannel Flat Tube