Numerical study of the Rayleigh-Benard convection in two-dimensional cavities heated by elliptical heat sources using the lattice Boltzmann method

被引：15
作者：
Chaabane, Raoudha [1 ]
Kolsi, Lioua [2 ]
Jemni, Abdelmajid [1 ]
Alshammari, Naif K. [3 ]
D'Orazio, Annunziata [4 ]
机构：
[1] Univ Monastir, Lab Thermal & Energet Syst Studies LESTE, Natl Sch Engn Monastir, Monastir, Tunisia
[2] Hail Univ, Dept Mech Engn, Coll Engn, Hail City, Saudi Arabia
[3] Univ Monastir, Natl Engn Sch, Energy Engn Dept, Res Lab Metrol & Energy Syst, Monastir 5000, Tunisia
[4] Sapienza Univ Roma, Dipartimento Ingn Astronaut Elettr & Energet, Fac Ingn, Rome, Italy
来源：
PHYSICS OF FLUIDS | 2021年 / 33卷 / 12期
关键词：
ENTROPY GENERATION ANALYSIS; NANOFLUID FILLED CAVITY; NATURAL-CONVECTION; SQUARE ENCLOSURE; MIXED CONVECTION; TRANSIENT CONDUCTION; SIMULATION; CYLINDERS; RADIATION; MODEL;
D O I：
10.1063/5.0073856
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
This study aims to investigate numerically the Rayleigh-Benard Convection using an in-house Fortran 90 code based on the lattice Boltzmann method. The bottom wall is equipped with two hot circular/elliptical sources and the right wall is open. The non-linear coupled differential governing equations are formulated using the lattice Boltzmann equation associated with the Boussinesq approximation. The simulations are conducted for (10(3) & LE; Ra & LE; 10(6)) and Pr = 0.7 (corresponding to air). The code verification showed a good reliability of the present mesoscopic numerical approach. Several configurations related to the size and shape of the heaters were studied. It was found that elliptically shaped heat sources provide higher heat transfer rates compared to circular sources.
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页数：9
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