Experimental Investigation on Heat Transfer and Pressure Drop of Supercritical Carbon Dioxide in a Mini Vertical Upward Flow

Haicai Lyu (), Han Wang, Qincheng Bi and Fenglei Niu
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Haicai Lyu: School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206, China
Han Wang: School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206, China
Qincheng Bi: State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, No. 28 Xianning West Road, Xi’an 710049, China
Fenglei Niu: School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206, China

Energies, 2022, vol. 15, issue 17, 1-14

Abstract: Experiments on the convection heat transfer and pressure drop of supercritical carbon dioxide in a mini vertical upward flow were investigated in a smooth tube with an inner diameter of 2 mm. The experiments were conducted with pressures ranging from 7.62 to 8.44 MPa, mass fluxes ranging from 600 to 1600 kg·m −2 ·s −1 , and heat flux ranging from 49.3 to 152.3 kW·m −2 . Results show that the peak of heat transfer occurs when the bulk fluid temperature is below the proposed critical temperature and the wall temperature is above the proposed critical temperature. For the 2 mm vertical upward flow, the radial buoyancy effects are relatively weak, and the axial thermal acceleration effect cannot be negligible. In this study, a new modified Jackson correlation for the supercritical carbon dioxide is proposed for convective heat transfer. To reflect the effect of flow acceleration on heat transfer, a dimensionless heat flux was introduced to construct a new semi-correlation of heat transfer. The new correlation of friction factor taking into account the variation of density and dynamic viscosity was proposed with 146 experimental data within a ±20% error band.

Keywords: supercritical carbon dioxide; convection heat transfer; friction factor; vertical upward; flow acceleration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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