微通道内超声振荡两相流
Ultrasonic Oscillatory Two-phase Flow in Microchannels
摘要：
通过实验和数值模拟研究了微通道内超声振荡两相流的输运特性。这项工作的灵感来自于在一个创新的超声波织物干燥装置中观察到的流动，该装置使用具有微通道的压电双晶片换能器，其中水-空气两相流通过谐波振荡的微通道输送。由于水和空气在振动周期中相互作用，流动表现出高度不稳定的行为，使其与微通道中的稳定流动有显着不同。将湍流雷诺平均Navier-Stokes（RANS）k- $ω$模型与相场法相结合，实现了两相流的计算流体动力学（CFD）模拟。数值结果得到了实验的定性验证。通过参数研究，我们专门检查了振动条件的影响（即，频率和振幅）、微通道锥角和壁表面接触角（即，润湿性）对通过微通道的流速的影响。研究结果将为微通道内存在振荡或一般非定常两相流的场合提供参考。
英文摘要：
Experimental and numerical investigations are performed to provide an assessment of the transport behavior of an ultrasonic oscillatory two-phase flow in a microchannel. The work is inspired by the flow observed in an innovative ultrasonic fabric drying device using a piezoelectric bimorph transducer with microchannels, where a water-air two-phase flow is transported by harmonically oscillating microchannels. The flow exhibits highly unsteady behavior as the water and air interact with each other during the vibration cycles, making it significantly different from the well-studied steady flow in microchannels. The computational fluid dynamics (CFD) modeling is realized by combing the turbulence Reynolds-averaged Navier-Stokes (RANS) k-$ω$ model with the phase-field method to resolve the dynamics of the two-phase flow. The numerical results are qualitatively validated by the experiment. Through parametric studies, we specifically examined the effects of vibration conditions (i.e., frequency and amplitude), microchannel taper angle, and wall surface contact angle (i.e., wettability) on the flow rate through the microchannel. The results will advance the potential applications where oscillatory or general unsteady microchannel two-phase flows may be present.
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