Numerical Investigation of Heat Transfer Characteristics of scCO(2) Flowing in a Vertically-Upward Tube with High Mass Flux

doi:10.3390/e24010079

CORC > 兰州理工大学 > 兰州理工大学 > 机电工程学院

	Numerical Investigation of Heat Transfer Characteristics of scCO(2) Flowing in a Vertically-Upward Tube with High Mass Flux
	Gong, Kaigang; Zhu, Bingguo; Peng, Bin; He, Jixiang
刊名	ENTROPY
	2022
卷号	24 期号:1
关键词	supercritical carbon dioxide heat transfer high mass flux pseudo-boiling
DOI	10.3390/e24010079
英文摘要	In this work, the heat transfer characteristics of supercritical pressure CO2 in vertical heating tube with 10 mm inner diameter under high mass flux were investigated by using an SST k-omega turbulent model. The influences of inlet temperature, heat flux, mass flux, buoyancy and flow acceleration on the heat transfer of supercritical pressure CO2 were discussed. Our results show that the buoyancy and flow acceleration effect based on single phase fluid assumption fail to explain the current simulation results. Here, supercritical pseudo-boiling theory is introduced to deal with heat transfer of scCO(2). scCO(2) is treated to have a heterogeneous structure consisting of vapor-like fluid and liquid-like fluid. A physical model of scCO(2) heat transfer in vertical heating tube was established containing a gas-like layer near the wall and a liquid-like fluid layer. Detailed distribution of thermophysical properties and turbulence in radial direction show that scCO(2) heat transfer is greatly affected by the thickness of gas-like film, thermal properties of gas-like film and turbulent kinetic energy in the near-wall region. Buoyancy parameters Bu < 10(-5), Bu* < 5.6 x 10(-7) and flow acceleration parameter K-v < 3 x 10(-6) in this paper, which indicate that buoyancy effect and flow acceleration effect has no influence on heat transfer of scCO(2) under high mass fluxes. This work successfully explains the heat transfer mechanism of supercritical fluid under high mass flux.
WOS研究方向	Physics
语种	英语
出版者	MDPI
WOS记录号	WOS:000747482900001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/154889]
专题	机电工程学院
作者单位	Lanzhou Univ Technol, Sch Mech & Elect Engn, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Gong, Kaigang,Zhu, Bingguo,Peng, Bin,et al. Numerical Investigation of Heat Transfer Characteristics of scCO(2) Flowing in a Vertically-Upward Tube with High Mass Flux[J]. ENTROPY,2022,24(1).
APA	Gong, Kaigang,Zhu, Bingguo,Peng, Bin,&He, Jixiang.(2022).Numerical Investigation of Heat Transfer Characteristics of scCO(2) Flowing in a Vertically-Upward Tube with High Mass Flux.ENTROPY,24(1).
MLA	Gong, Kaigang,et al."Numerical Investigation of Heat Transfer Characteristics of scCO(2) Flowing in a Vertically-Upward Tube with High Mass Flux".ENTROPY 24.1(2022).