磁场作用下倾斜方腔内纳米流体自然对流数值模拟

Numerical Simulation of Natural Convection of Nanofluids in an Inclined Square Cavity under the Effect of Magnetic Field

采用Chebyshev配置点谱方法对倾斜方腔内纳米流体自然对流换热进行了数值模拟.倾斜方腔的左右壁面为恒温壁面,上下壁面为绝热壁面,并施加了与方腔下壁面平行的磁场.方腔内充满了以水为基液的不同纳米颗粒.研究方腔倾斜角度γ、Gr数和纳米颗粒对纳米流体流动与传热的影响.研究结果表明:传热在倾斜角度为π/4时最大,当方腔倾斜角度为π/3时传热受到抑制;纳米流体流动与传热受Gr数影响比较显著;不同纳米颗粒对传热影响趋势大致相同.

The natural convetion of nanofluids in an inclined square cavity are numerically simulated by using Chebyshev collocation spectral methods.The left-hand and right-hand walls of the cavity were kept at a constant temperature,while the upper and lower walls were insulated.The magnetic field parallel to the lower wall of the inclined cavity is imposed.The cavity is filled with different nanoparticles,based on water.The effects of pertinent parameters such as the inclined angle of the square cavity,Grashof number and the solid nanoparticles on the fluid flow and heat transfer of nanofluids.The results show that the heat transfer of nanofluids is maximum when the inclined angle isπ/4,while the heat transfer of nanofluids is restrained when the inclined angle isπ/3.The fluid flow and heat transfer of nanofluids are a significant change with Grashof number.The influence of different nanoparticles on heat transfer is similar.