Study on Convective Heat Transfer of Supercritical Nitrogen in a Vertical Tube for Liquid Air Energy Storage

Qinghua Yu, Yuxiang Peng, Ciprian Constantin Negoescu, Yi Wang and Yongliang Li
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Qinghua Yu: Hubei Key Laboratory of Advanced Technology for Automotive Components, School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China
Yuxiang Peng: Hubei Key Laboratory of Advanced Technology for Automotive Components, School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China
Ciprian Constantin Negoescu: Birmingham Centre for Energy Storage, School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, UK
Yi Wang: Birmingham Centre for Energy Storage, School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, UK
Yongliang Li: Birmingham Centre for Energy Storage, School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, UK

Energies, 2021, vol. 14, issue 22, 1-20

Abstract: The convective heat transfer behavior of supercritical nitrogen (S-N 2 ) has played a significant role in optimizing the design of recently emerging cryogenic cold storage and recovery systems. However, studies on S-N 2 heat transfer have been relatively scarce, not to mention that there is a legitimate urge for a robust numerical model to accurately predict and explain S-N 2 heat transfer under various working conditions. In this paper, both experimental and numerical studies were conducted for convective heat transfer of S-N 2 in a small vertical tube. The results demonstrated that the standard k - ? model performed better for predicting the key heat transfer characteristics of S-N 2 than the SST k - ? model. The effects of heat flux and inlet pressure on the heat transfer characteristics under a large mass flux were evaluated. The variation mechanisms of local heat transfer performance were revealed by illustrating radial profiles of thermophysical properties and turbulent parameters of N 2 . It was found that the local performance variation along the flow direction was mainly determined by the radial profile of specific heat while the variation of the best local performance with the ratio of heat flux to mass flux was mainly determined by the radial profile of turbulent viscosity.

Keywords: supercritical nitrogen; convective heat transfer; energy storage; effective thermal conductivity; CFD simulation (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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