恒壁温下管内流体脉动流动对流换热的数值模拟

A Numerical Simulation on the Influence of Pulsating Flow on Convective Heat Transfer at Constant Wall Temperature

利用FLUENT软件,在流体进口速度发生周期性变化的情况下,对圆管内层流的流体流动与换热情况进行了数值模拟,分析了无因次脉动幅值、频率对对流换热系数、摩擦系数以及流场的影响,结果表明脉动流体会强化或弱化换热效果,阻力比无脉动时大,并且在流场中有与主流区流动方向相反的流动现象。

Using software Fluent, the convective heat transfer process through a duct is simulated when the inlet velocity of the fluid is varied periodically, The effect of non-dimensional amplitude and frequency on the convection heat transfer coefficient and friction factor is analyzed. The results show that the convection heat transfer is enhanced or weakened by pulsation flow and the resistance of pulsating flow is more than that of non-pulsation flow. At the same time, the inverse flow exists in the flow field,