Luo Xiaoming, Cao Juhang, Ren Jing, Yan Haipeng, He Limin
College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, PR China.
College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, PR China.
Ultrason Sonochem. 2017 Nov;39:461-466. doi: 10.1016/j.ultsonch.2017.05.006. Epub 2017 May 6.
The suspension characteristics of water droplet in oil were investigated under ultrasonic standing waves with high-speed photography in this paper. Firstly, the suspension position of droplet was predicted by theoretical derivation. The motion trajectory of droplet was captured and a kinetic analysis was applied to characterize the suspension position of droplet. The effects of droplet size, acoustic pressure, frequency, as well as density ratio of water and oil on the suspension position of droplet were analyzed in details. It was proved that the droplet size had little effect on the suspension position at different frequencies. The suspension zone approached minimum at 39.4kHz, and the suspension position of droplet was insensitive to acoustic pressure amplitude and density ratio at this frequency. These would be advantageous to maintain the stability of droplet banding and shorten the width of banding. In addition, it was proved that the suspension position of droplet is approximately linear with the density ratio at different frequencies.
本文利用高速摄影技术研究了超声驻波作用下油中水滴的悬浮特性。首先，通过理论推导预测了水滴的悬浮位置。捕捉了水滴的运动轨迹，并进行了动力学分析以表征水滴的悬浮位置。详细分析了水滴尺寸、声压、频率以及水与油的密度比对水滴悬浮位置的影响。结果表明，在不同频率下，水滴尺寸对悬浮位置影响较小。在39.4kHz时悬浮区接近最小值，在此频率下水滴的悬浮位置对声压幅值和密度比不敏感。这些有利于维持液滴条带的稳定性并缩短条带宽度。此外，还证明了在不同频率下，水滴的悬浮位置与密度比近似呈线性关系。
