侧向局部加热对流的周期性

通过流体力学方程组的数值模拟,研究了侧向局部加热条件下Prandtl数Pr=0.0272时流体对流的周期性.结果表明:随着Grashof数Gr的增加,对流按稳态对流、单局部周期对流、双局部周期对流、准周期对流的顺序发展.当Gr<3.6×103时,对流为稳态;在3.6×103

Periodicity of Convection Under Lateral Local Heating

The periodicity of convection under lateral local heating with Prandtl number Pr=0.0272 was studied through numerical simulation of hydrodynamic equations.The results show that,convection develops in the order of steady⁃state convection,single⁃local⁃period convec⁃tion,double⁃local⁃period convection and quasi⁃period convection with the increase of Grashof number Gr.Convection is steady for Gr<3.6×103.In the range of 3.6×1033.5×106,convection has a quasi period.In the steady convection case,the position of the convection roll corresponding to the heating zone on the wall does not change with time.In the single⁃local⁃period convection case,the core of the convection roll corre⁃sponding to the upper heating zone on the wall moves periodically with time.In the double⁃lo⁃cal⁃period convection case,the cores of the convection rolls corresponding to the 2 heating zones on the wall move periodically with time.In the quasi⁃period convection case,there are small convection rolls with quasi⁃period variations in the upper and lower parts of the convec⁃tion loop corresponding to the lower unheated zone on the wall.In the range of the convection periods mentioned above,the convection period decreases with the increase of Grashof number Gr for given Prandtl number Pr.