Journal
CASE STUDIES IN THERMAL ENGINEERING
Volume 32, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.csite.2022.101902
Keywords
Hybrid lattice Boltzmann; 3D natural convection; Conduction; Surface radiation; Vorticity-vector potential variables
Categories
Funding
- Russian Science Foundation [21-79-00011]
- Russian Science Foundation [21-79-00011] Funding Source: Russian Science Foundation
Ask authors/readers for more resources
This study introduces a hybrid lattice Boltzmann scheme for three-dimensional heat transfer, including conduction, natural convection, and radiation. The study analyzes temperature and flow behavior under different parameters and finds that the 3D model is more accurate when studying radiation heat transfer.
In this study, the hybrid lattice Boltzmann scheme is introduced for three-dimensional heat transfer by conduction, natural convection and radiation. The mesoscopic LBGK model with the D3Q19 stencil is used to describe the flow pattern whereas the thermal model is formulated in terms of the finite difference solution of the macroscopic energy equation. The governing equations are solved in MatLab by means of the in-house code validated on experimental and numerical benchmark data. Three-dimensional heat transfer and flow patterns are analyzed when varying the Rayleigh number 10(4) <= Ra <= 10(6), solid-fluid interfaces emissivity 0 <= epsilon <= 1, walls thickness 0.05 <= M <= 0.2. During numerical simulations, it is found that temperature of the air and solid walls is reduced with an increment in the Rayleigh number under studied conditions. However, the flow field is slightly altered with Ra. Computational performance of the hybrid lattice Boltzmann model is significantly better than the conventional vorticity-vector potential formulation. No radiation heat transfer mode provides thermal stratification in the entire cavity. Along with that, thermal and flow behavior are very similar under the 2D and 3D simulations. On the contrary, a significant discrepancy is observed in the temperature and velocity values when taking into account surface radiation. Hence, it is very important to implement the 3D model when studying conductive-convective-radiative heat transfer under the top location of the heater.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available