Experimental study on the inhibition of heat transfer deterioration of supercritical pressure CO<sub>2</sub>

doi:10.16511/j.cnki.qhdxxb.2018.25.046

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Abstract The heat transfer can deteriorate with supercritical pressure fluids flowing in vertical tubes due to buoyancy. This study used a helical insert in the tube to change the flow structure and improve fluid heat transfer. Convection heat transfer of supercritical pressure CO₂ in a vertical bare tube and with a helical insert was investigated experimentally to identify the effects of the heat flux, inlet Re, and flow direction on the heat transfer for both cases. The wall temperature distribution is nonlinear due to the buoyancy effect with the peak wall temperature gradually moving towards the entrance as the heat flux increases. The helical structure inserted into the bare tube effectively suppresses the heat transfer deterioration caused by the buoyancy effect and significantly increases the convective heat transfer the supercritical pressure CO₂ in vertical tubes. The buoyancy effect can still reduce the heat transfer with supercritical pressure CO₂ upward flow even with the helical insert structure for high heat fluxes.

Keywords inhibition of heat transfer deterioration supercritical pressure CO₂

Issue Date: 13 December 2018

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	WANG Zhenchuan
	XU Ruina
	XIONG Chao
	JIANG Peixue

Cite this article:

WANG Zhenchuan,XU Ruina,XIONG Chao, et al. Experimental study on the inhibition of heat transfer deterioration of supercritical pressure CO₂[J]. Journal of Tsinghua University(Science and Technology), 2018, 58(12): 1101-1106.

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http://jst.tsinghuajournals.com/EN/10.16511/j.cnki.qhdxxb.2018.25.046 OR http://jst.tsinghuajournals.com/EN/Y2018/V58/I12/1101

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