采用理论推导与数值模拟结合的方法，通过求解流动方程及能量方程得到壁面法向振动下流体流动特性变化规律，并分析振动对换热的影响。结果表明：层流状态下，低强度振动使壁面附近流体质点产生法向速度，但影响范围很小，对换热影响有限；随着振动强度的增大，流场逐渐转变为湍流，导致换热系数提升。通过数值模拟计算壁面平均努塞尔数随振动强度及来流速度的变化规律。结果表明：对于低速流体，当振动达到某一临界值后能增强换热效果，努塞尔数随振动强度增大而增加，最佳换热相位角在200°左右，低雷诺数下振动强化换热效果较为明显，对流换热系数最大可提升300%。

Using a combination of theoretical derivation and numerical simulation,the fluid flow characteristics under normal wall vibration are obtained by solving the flow equation and the energy equation,and the effect of vibration on heat transfer is analyzed.The results show that under laminar flow,lowintensity vibration will cause normal velocity of fluid particles near the wall surface,but the influence range is small,and the influence on heat transfer is limited.As the vibration intensity increases,the flow field gradually changes into turbulent flow,resulting in increased thermal coefficient.The variation of the average Nusselt number of the wall with the vibration intensity and the incoming flow velocity is calculated by numerical simulation.The results show that for lowspeed fluids,when the vibration reaches a certain critical value,the heat transfer effect can be enhanced.The Nusselt number increases with the increase of the vibration intensity.The optimal heat transfer phase angle is around 200°.At low Reynolds number,the heat transfer enhancement by the vibration is more evident,with the largest increase of 300%.

TK124