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运用Fluent UDF动网格技术将二维流场中振动对带肋矩形直通道的流动与换热特性进行了数值模拟,分析了相同振动条件下入口速度对流动与换热的影响,以及相同振动强度下振幅和频率对流动与换热的影响.结果表明:相同振动条件下,Re越大,换热增长率越低,入口静压波动越大,且静压峰值相位相对于振动峰值相位逐渐超前;相同振动强度下,振幅越大,振动引起的换热波动越小,换热增长率越低;当振幅大于一个临界值时,振幅对换热的影响不明显;振幅越大,入口静压波动幅度越大;振动可以强化换热,但是随着Re和振幅的增大,局部区域会出现抑制换热的情况.
Fluent UDF moving grid technique was used to simulate the flow and heat transfer characteristics of two-dimensional flow field in a straight channel with a ribbed rectangle. The influence of inlet velocity on flow and heat transfer under the same vibration condition was analyzed. The same vibration The results show that under the same vibration condition, the larger the Re is, the lower the heat transfer growth rate is, the larger the static pressure at inlet is, and the peak phase of static pressure is gradually shifted from the peak phase of vibration In the same vibration intensity, the larger the amplitude, the smaller the heat transfer caused by vibration, the lower the heat transfer growth rate. When the amplitude is greater than a critical value, the effect of amplitude on heat transfer is insignificant; The larger the pressure fluctuation is, the more heat can be enhanced by vibration. However, with the increase of Re and amplitude, the heat transfer will be suppressed in some areas.