Development and Assessment of an Isotropic Four-Equation Model for Heat Transfer of Low Prandtl Number Fluids

doi:10.3389/fenrg.2022.816560

	Development and Assessment of an Isotropic Four-Equation Model for Heat Transfer of Low Prandtl Number Fluids
	Su, Xingkang 1,2; Li, Xianwen 1,2; Wang, Xiangyang 3; Liu, Yang 3; Chen, Qijian 3; Shi, Qianwan 3; Sheng, Xin 1,2; Gu, Long 1,2,3
刊名	FRONTIERS IN ENERGY RESEARCH
	2022-02-08
卷号	10 页码:15
关键词	low Pr fluid four-equation OpenFOAM heat transfer liquid metal
ISSN号	2296-598X
DOI	10.3389/fenrg.2022.816560
通讯作者	Gu, Long(gulong@impcas.ac.cn)
英文摘要	In the simple gradient diffusion hypothesis, the turbulent Prandtl number ( P r t ) with a constant of 0.85 is difficult to accurately predict for liquid metals having low Prandtl numbers ( P r ), while a four-equation model can improve this solution by introducing the turbulence time-scale into the calculation of turbulent thermal diffusivity. However, the four-equation model's transport form and numerical stability are so complex that suitable commercial code is lacking. Therefore, an isotropic four-equation model with simple Dirichlet wall boundary conditions is built in the present work. Based on the open-source computational fluid dynamics program OpenFOAM, the fully developed velocity, temperature, Reynolds stress, and heat flux of low P r fluids ( P r = 0.01-0.05) in the parallel plane are obtained by numerical simulation. The results show that the time-average statistics predicted using the present four-equation model are in good agreement with the direct numerical simulation data. Then, the isotropic four-equation model is used to analyze the flow and heat of liquid metal ( P r = 0.01) in a quadrilateral infinite rod bundle. The numerical results are compared with the various and available experimental relationships. The Nusselt numbers calculated using the isotropic four-equation model are betweenness the available correlations, while the turbulent Prandtl number model using a constant of 0.85 over predicts heat transfer. More detailed local heat transfer phenomena and distribution of low Pr fluids are obtained using the present isotropic four-equation model.
资助项目	[2020YFB1902104] ; [Y828020XZ0]
WOS关键词	TRANSFER TURBULENCE MODEL ; CHANNEL FLOW ; 2ND-MOMENT CLOSURE ; SIMULATIONS ; CONVECTION ; DNS ; TRANSPORT
WOS研究方向	Energy & Fuels
语种	英语
出版者	FRONTIERS MEDIA SA
WOS记录号	WOS:000761015500001
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/142041]
专题	中国科学院近代物理研究所
通讯作者	Gu, Long
作者单位	1.Chinese Acad Sci, Inst Modern Phys, Lanzhou, Peoples R China 2.Univ Chinese Acad Sci, Sch Nucl Sci & Technol, Beijing, Peoples R China 3.Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou, Peoples R China
推荐引用方式 GB/T 7714	Su, Xingkang,Li, Xianwen,Wang, Xiangyang,et al. Development and Assessment of an Isotropic Four-Equation Model for Heat Transfer of Low Prandtl Number Fluids[J]. FRONTIERS IN ENERGY RESEARCH,2022,10:15.
APA	Su, Xingkang.,Li, Xianwen.,Wang, Xiangyang.,Liu, Yang.,Chen, Qijian.,...&Gu, Long.(2022).Development and Assessment of an Isotropic Four-Equation Model for Heat Transfer of Low Prandtl Number Fluids.FRONTIERS IN ENERGY RESEARCH,10,15.
MLA	Su, Xingkang,et al."Development and Assessment of an Isotropic Four-Equation Model for Heat Transfer of Low Prandtl Number Fluids".FRONTIERS IN ENERGY RESEARCH 10(2022):15.