Lattice BGK simulations of the double diffusive mixed convection in an enclosure with different outlet locations. (January 2016)

• Record Type: Journal Article
• Authors: Xu, Hongtao; Li, Beibei; Chen, Jian; Lou, Qin; Yan, Zhenrong; Yang, Mo
• Is Part Of: International journal of heat and mass transfer. Volume 92(2016:Jan.)
• Page Start: 158
• Page End: 172
• Publication Date: 2016-01
• Subjects: TCLBGK model -- Double diffusive mixed convection -- Enclosure -- Cylinder; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2015.08.100
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: This paper is related to the lattice BGK simulation for double diffusive mixed convection. The effects of Lewis number, buoyancy ratio and outlet position are mainly discussed. Different outlet positions mainly influence the isoconcentration distributions at the upper space above the heated cylinder. Average Nusselt and Sherwood numbers are investigated per the changes of Lewis number and buoyancy ratio. Abstract: This article adopts a temperature-concentration lattice Bhatnagar–Gross–Krook (TCLBGK) model to investigate the double diffusive mixed convection around a heated cylinder in an enclosure with different outlet locations. In this model, the distributions of velocity, temperature and concentration are derived by solving three independent LBGK equations which are combined into a coupled equation. A parametric study illustrating the influence of Lewis number Le, buoyancy ratio Br and outlet locations on the double diffusive mixed convection is performed while Richardson number Ri and Prandtl number Pr are set to be 1.0 and 0.7 respectively. Results are presented in terms of isotherms, streamlines, isoconcentrations, average Nusselt and Sherwood numbers around the heated cylinder in the enclosure.