Development of an ultrasonic void fraction profiler
Development of an ultrasonic void fraction profiler
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DOI：
10.1088/0957-0233/20/11/114003
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发表时间：
2009-11-01
影响因子：
2.4
通讯作者：
Takeda, Yasushi
中科院分区：
文献类型：
--
作者：
Murai, Yuichi;Ohta, Shoko;Takeda, Yasushi
提出了一种测量泡状两相流空泡率空间分布的方法。该方法被称为超声波空隙率剖面，因为它是基于气泡界面上的超声波脉冲散射的信号处理。该方法是建立使用两个过程的超声波传感的气泡。一种方法是沿测量线（即，液体中的超声脉冲的路径）沿着检测气泡界面。接口捕获使用两种类型的信号处理方案：回波强度法和多普勒方法。另一种方法是从气泡界面的数量重建空泡分数分布。通过考虑气泡悬浮液中的超声反射，提出了一个估计的理论公式。通过理论和数值计算验证了该公式的有效性。最后，将本文所发展的方法应用于四种流动形态的演示，其中含气率分布控制液体流场的调制。
A method for measuring the spatial distribution of the void fraction in bubbly two-phase flow is presented. The method is referred to as ultrasonic void fraction profiling since it is based on the signal processing of an ultrasonic pulse scattering on a bubble interface. The method is established using two processes for the ultrasonic sensing of bubbles. One approach is to detect the bubble interface along a measurement line, i.e. the path of the ultrasonic pulse in the liquid. The interface is captured using two types of signal-processing schemes: the echo intensity method and the Doppler method. The other approach is to reconstruct the void fraction profile from the number of bubble interfaces. A theoretical formula for the estimation is proposed by considering ultrasonic reflection in a suspension of bubbles. The validity of the formula is examined with theoretical and numerical bases. Finally, the method developed here is applied to four flow configurations for the demonstration, in which the void fraction profile governs the modulation of liquid flow field.