Lattice Boltzmann method to simulate convection heat transfer in a microchannel under heat flux: Gravity and inclination angle on slip-velocity

摘要

Purpose - The purpose of this paper is to improve the lattice Boltzmann method's ability to simulate a microflow under constant heat flux. Design/methodology/approach - Develop the thermal lattice Boltzmann method based on double population of hydrodynamic and thermal distribution functions. Findings - The buoyancy forces, caused by gravity, can change the hydrodynamic properties of the flow. As a result, the gravity term was included in the Boltzmann equation as an external force, and the equations were rewritten under new conditions. Originality/value - To the best of the authors' knowledge, the current study is the first attempt to investigate mixed-convection heat transfer in an inclined microchannel in a slip flow regime.