利用格子Boltzmann方法模拟矩形腔内纳米流体Raleigh-Benard对流

Nanofluid Raleigh-Benard convection in rectangular cavity: simulation with lattice Boltzmann method

利用格子Boltzmann方法模拟矩形腔内纳米流体Rayleigh-Benard对流,得到温度场和流线分布,比较分析不同Ra数、体积分数、粒径下纳米流体对流换热的变化情况.结果表明:在相同的Ra数和体积分数下,纳米流体的对流换热随着粒径的增大而减弱;在相同的Ra数和粒径下,纳米流体的对流换热随着体积分数增大而增强.

The lattice Boltzmann method is used to simulate the thermal field and flow field of nanofluid Raleigh-Benard convection in a rectangular cavity. The heat transfer characteristics of nanofluid are compared under different Raleigh numbers, volume fractions of nanoparticles and particle sizes. The results show that under the same Raleigh number and volume fraction, the convection heat transfer of nanofluid becomes weakened by increasing the particle size. Under the same Raleigh number and particle size, the convection heat transfer of nanofluid becomes strengthened by increasing the volume fraction of nanoparticles.