Ultrasonic detection of moving interfaces in gas-liquid two-phase flow
Ultrasonic detection of moving interfaces in gas-liquid two-phase flow
复制标题
DOI：
10.1016/j.flowmeasinst.2010.03.007
复制
发表时间：
2010-09-01
影响因子：
2.2
通讯作者：
Roberto Gonzalez A, S.
中科院分区：
文献类型：
--
作者：
Murai, Yuichi;Tasaka, Yuji;Roberto Gonzalez A, S.
当声阻抗发生较大变化时，超声在气液界面处会发生强烈反射。我们利用这种现象来检测的瞬时位置的接口从脉冲超声的飞行时间。由于反射波的特性取决于界面相对于超声波波长的形状和大小，因此单一传感原理不足以捕获广义气液两相流的界面。在本研究中，我们设计和检查三种类型的超声界面检测技术：回波强度技术，局部多普勒技术，和速度方差技术，并调查和比较各自的优点和局限性。结果表明，回波强度技术是适当的湍流界面，导致超声散射在宽角度。与此相反，本地多普勒技术需要捕捉从光滑界面和气泡反射的波的信息。最后，我们发现，速度方差技术适用于准稳态和周期性的两相流，并将此技术应用于水平段塞流的管内。(C)2010爱思唯尔有限公司版权所有。
Ultrasound reflects strongly off the gas-liquid interface when there is a large change in acoustic impedance. We exploit this phenomenon to detect the instantaneous position of the interface from the time of flight of pulsed ultrasound. Because the characteristics of the reflected wave depend on the shape and size of the interface relative to the ultrasound wavelength, the single-sensing principle is insufficient to capture the interface for generalized gas-liquid two-phase flows. In the present study, we design and examine three types of ultrasound interface detection techniques: the echo intensity technique, the local Doppler technique, and the velocity-variance technique, and investigate and compare the merits and limitations of each. The results indicate that the echo intensity technique is appropriate for turbulent interfaces that cause ultrasound scattering over wide angles. In contrast, the local Doppler technique is required to capture information from waves reflected from smooth interfaces and bubbles. Finally, we find that the velocity-variance technique works for quasi-steady and periodical two-phase flow, and we apply this technique to horizontal slug flow in a tube. (C) 2010 Elsevier Ltd. All rights reserved.