Abstract
Instantaneous velocity profiles of liquid and bubbles are important thermal-hydraulic parameters which play essential role in study of heat, mass transfer of bubbly two-phase flow. Using spike signal with control of damping parameter, we have successfully developed a multiwave ultrasonic measurement method to obtain instantaneous velocity profiles of liquid and bubble phase of bubbly two-phase flow. For analysis of echo signals, the ultrasonic pulse repetition method has been exploited. The method is robust and computationally efficient. Moreover, this measurement method enables a significant reduction of expenses by using commonly used, popular spike pulser/receivers of ultrasonic inspection industry. In addition, a phase separation method has also been proposed to completely separate liquid data and bubble data. Measurement has been carried out for bubbly counter-current two-phase flow in a vertical pipe of 50mm I.D. Instantaneous velocity profiles of liquid and bubbles have been measured.
