Mixed convection in inclined lid driven cavity by Lattice Boltzmann Method and heat flux boundary condition

32nd UIT (Italian Union of Thermo–fluid-dynamics) Heat Transfer Conference

物理学;力学

D'Orazio, A.^1 ; Karimipour, A.^2 ; Nezhad, A.H.^3 ; Shirani, E.^4,5

Dipartimento di IngegneriaAstronautica, Elettrica Ed Energetica, Sapienza Università' di Roma, Via Eudossiana 18, Rome

00184, Italy^1

Dipartimento Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Isfahan

8196848531, Iran^2

Department of Mechanical Engineering, University of Sistan and Baluchestan, Daneshgah Street, Zahedan

98135-987, Iran^3

Department of Mechanical Engineering, Isfahan University of Technology, Imam Khomeini Street, Daneshgah Street, Isfahan

84156-83111, Iran^4

Foolad Institute of Technology, Shohada Blv, FooladShahr, Isfahan

8491663763, Iran^5

关键词: Flux boundary conditions;    Horizontal cavities;    Lattice Boltzmann method;    Lid-driven cavities;    Natural convection flow;    Thermal lattice-Boltzmann method;    Transfer phenomenon;    Two-dimensional rectangular;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/547/1/012031/pdf
DOI  :  10.1088/1742-6596/547/1/012031

学科分类：力学，机械学

来源: IOP

【 摘 要 】

Laminar mixed convective heat transfer in two-dimensional rectangular inclined driven cavity is studied numerically by means of a double population thermal Lattice Boltzmann method. Through the top moving lid the heat flux enters the cavity whereas it leaves the system through the bottom wall; side walls are adiabatic. The counter-slip internal energy density boundary condition, able to simulate an imposed non zero heat flux at the wall, is applied, in order to demonstrate that it can be effectively used to simulate heat transfer phenomena also in case of moving walls. Results are analyzed over a range of the Richardson numbers and tilting angles of the enclosure, encompassing the dominating forced convection, mixed convection, and dominating natural convection flow regimes. As expected, heat transfer rate increases as increases the inclination angle, but this effect is significant for higher Richardson numbers, when buoyancy forces dominate the problem; for horizontal cavity, average Nusselt number decreases with the increase of Richardson number because of the stratified field configuration.