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情况并且分析振动对于换热的影响。结果表明：层流状态下,低强度振动会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。通过数值模拟计算不同振动强度、不同来流速度下刚性壁面振动换热的影响。结果表明：对于低速流体,当振动达到某一临界值后能提高换热效果,努塞尔数随振动强度增大而增加,低雷诺数下振动强化换热效果较为明显,换热效果最大可提升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 effects of vibration heat transfer on the rigid wall under different vibration strengths and different incoming speeds are calculated through numerical simulation. The results show that for low-speed fluids, when the vibration reaches a certain critical value, the heat transfer effect can be improved. The Nusselt number increases with the increase of the vibration intensity. At low Reynolds number, the vibration enhancement heat transfer effect is more obvious, and the heat transfer effect is the largest Increase by 300%.

TK124