Heat transfer of supercritical CO2 in vertical round tube: A considerate turbulent Prandtl number modification

Xin Du, Zhihao Lv, Xiao Yu, Maoguo Cao, Jianjun Zhou, Yongxiang Ren, Qinggang Qiu and Xiaojing Zhu

Energy, 2020, vol. 192, issue C

Abstract: In order to predict the heat transfer deterioration (HTD) of supercritical pressure fluids and to provide practical guidance for engineering applications of supercritical pressure CO2 (SC-CO2), a considerate turbulent Prandtl number (Prt) modification was proposed with the use of shear stress transport k−ω turbulent model. The proposed variable Prt model considering the effects of system pressure, fluid properties and tube diameters was validated by comparing with 26 reported experimental data, especially for HTD cases. The comparison results show that the present model not only predicts the HTD but also reproduces the onset of it. The modification of Prt in the buffer layer is the key to predict the wall temperature accurately, since the modified Prt changes in association with the molecular Pr and accommodates the contribution rate of molecular conduction to turbulent mixing on heat transfer. Moreover, the correction factors for tube diameter and system pressure are implemented to adjust the modification of Prt. The applicability of the proposed model to various operating conditions is verified in this paper, therefore the present modification for Prt may be popularized to extensive engineering applications of SC-CO2, especially for the optimization design of SC-CO2 heat exchanger.

Keywords: Turbulent Prandtl number; Heat transfer; Supercritical carbon dioxide; Boundary layer; Tube diameter (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:192:y:2020:i:c:s0360544219323072

DOI: 10.1016/j.energy.2019.116612

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