Thermal-hydraulic characteristics of supercritical pressure CO2 in vertical tubes under cooling and heating conditions

Jiangfeng Guo, Mengru Xiang, Haiyan Zhang, Xiulan Huai, Keyong Cheng and Xinying Cui

Energy, 2019, vol. 170, issue C, 1067-1081

Abstract: The thermal-hydraulic properties of supercritical pressure CO2 (SCO2) in vertical tubes under cooling and heating conditions were numerically investigated by using SST turbulent model with variable turbulent Prandtl number model. Under cooling condition, the peak of heat transfer coefficient appears near the pseudo-critical point, the buoyancy effect enhances local heat transfer for upward flow while deteriorates that for downward flow, and the criterion Gr¯/Re27 is more accurate than Bo∗ in the evaluation of buoyancy effect. Under heating condition, the buoyancy effect improves local heat transfer for downward flow while deteriorates that for upward flow. The local heat transfer deterioration only occurs in the case of Tb,inKeywords: Supercritical pressure CO2 (SCO2); Buoyancy effect; Heat transfer deterioration; Heat exchanger; Heat transfer; Pressure drop (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:170:y:2019:i:c:p:1067-1081

DOI: 10.1016/j.energy.2018.12.177

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