In order to study the growth of convective disturbance and heat transfer characteristics of rectangular cavity with sinusoidal periodic heating,the hydrodynamic equations were numerically simulated.The results showed that with the increase of Grashof number Gr,the growth rate of maximum amplitude Amax of convective disturbance increases while the time of linear growth phase decreases.For a cavity with aspect ratio A=10 and a width d=2 cm and for the fluid with Prandtl number Pr=6.949,the empirical formula of the growth rate γm of convective disturbance varying with Graschof number is γm=9 × 10-8 Gr1.2343.For a cavity with A=10 and d=6 cm and for the fluid with Pr=0.703,the empirical formula of the growth rate γm varing with Graschof number is γm=8 × 10-4 Gr0.52.At Pr=0.027 2,the correlation between the average Nusselt number(Nu)of the hot wall and Graschof number is(Nu)=0.000 02Gr1 17;at Pr=6.949,the correlation is(Nu)=0.000 24Gr1.05.The heat transfer capacity of the right wall increases with the increase of Graschof number.
关键词
矩形腔体/侧向正弦周期加热/对流扰动/成长率/传热能力
Key words
rectangular cavity/sinusoidal periodic heating from side/convective disturbance/growth rate/heat transfer capacity
维普
万方数据