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应用Fluent软件数值模拟超声空化对太阳集热器中不同管形(圆管和波纹管)换热效果的影响,并利用场协同理论对数值模拟的结果进行分析,分析结果表明:超声波频率和声压幅值对圆管和波纹管的换热效果均有影响,超声波频率越小、声压幅值越大,越有利于强化换热;超声波在管内传播时场协同数比无超声波大,且场协同数随声压幅值的增大而增大,此时温度场与速度场的协同程度较好;考虑强化换热与流体减阻之间的关系可知声压幅值越小,管内换热的综合性能效果较好。
Fluent software was used to simulate the effect of ultrasonic cavitation on the heat transfer of different tubes (circular tube and bellows) in the solar collector. The field synergy theory was used to analyze the numerical simulation results. The results showed that ultrasonic frequency and The amplitude of sound pressure has an effect on the heat transfer effects of the pipe and the bellows. The smaller the ultrasonic frequency is, the greater the sound pressure amplitude is, the more it is conducive to the enhancement of heat transfer. When the ultrasonic wave propagates in the pipe, And the number of field synergy increases with the increase of sound pressure amplitude, the degree of synergy between temperature field and velocity field is better at this time. Considering the relationship between heat transfer enhancement and fluid drag reduction, the smaller the sound pressure amplitude, The overall performance of heat exchange is better.