Numerical Study on Heat Transfer Characteristics of Droplet Impacting on Vibrating Surface
With the increasing heat dissipation demand of electronic equipment in some trans-portation systems,such as vehicle-mounted and airborne,the application fields of spray cooling are gradually increasing and the application environment is gradually complex.It is of great signifi-cance to determine the influence of vibration on the heat transfer process of spray cooling.Based on the VOF method and the dynamic mesh model,a numerical model of the droplet impacting on the vertically vibrating solid surface was established,and the influence of the change pattern of the vibration velocity of the surface and the variation of the vibration parameters on the heat transfer process was studied.The results show that for the three different vibration velocity change patterns of square wave,cosine wave and triangular wave,under the same maximum velocity and period,when the maximum velocity is small,the surface has the highest heat transfer capacity when the change pattern of surface velocity is cosine wave.With the increase of amplitude and frequency,the surface vibration affects heat transfer by changing contact area and contact time successively.When the amplitude and frequency are small,the surface vibration has a negative effect on heat transfer,and the heat transfer gradually increases with the increase of the amplitude and frequency,however,when the frequency is too large,although the temperature at the point of impact decreases,the overall heat transfer capacity decreases.
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