Indian Society for Heat and Mass Transfer

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Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)

ISSN: 2688-7231 (Online)

Numerical analysis of mixed convection flow using non-Boussinesq approximation lattice Boltzmann method

Shikha Bhuyan
Department of Mechanical Engineering, Tezpur University

Dipankar Narayan Basu
Department of Mechanical Engg., Indian Institute of Technology Guwahati, Guwahati 781039, India

DOI: 10.1615/IHMTC-2019.970
pages 575-580


The present work includes a numerical analysis of mixed convection flow using lattice Boltzmann method taking non- Boussinesq effect into the consideration. In conventional ways, the momentum and thermal relaxation times are specified at the beginning and are then kept constant throughout the simulation process. However, in the present model, as kinematic viscosity υ and thermal diffusivity α are functions of local temperature and the respective relaxation times are the function of these two parameters. Thereby, the numerical simulation is formulated accordingly. The simulations are done at Re=100 and Pr=0.71 varying aspect ratio for 4 and 2. The effect of aspect ratios is depicted in terms of streamlines, isotherms. It is also found from the study that inclination angle has a pronounced effect on both the Nusselt number and entropy generation values.

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