Abstract
We have many demands to understand flow phenomena in many industrial applications. Detecting the gas–liquid interface is important when measuring velocities in two-phase flow or in an open channel. We want to obtain velocity distributions two dimensionally, also. To extend the applicability, many techniques utilizing the ultrasonic Doppler velocity profiler (UVP) have been recently developed. This chapter shows these extended techniques. Liquid and gas velocity distributions are obtained simultaneously using a multi-wave transducer are described in Sect. 7.1. Techniques detecting a gas–liquid interface depending on fluid interface relative to the ultrasonic wavelength are presented in Sect. 7.2. The UVP is utilized for measuring void fraction distributions in Sect. 7.3. Section 7.4 shows a technique measuring two-dimensional velocity components. A new approach for improving temporal resolution using the ultrasonic correlation method is presented in Sect. 7.5.
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Murakawa, H., Kawaguchi, T., Obayashi, H., Murai, Y., Tasaka, Y. (2012). Extended Techniques. In: Takeda, Y. (eds) Ultrasonic Doppler Velocity Profiler for Fluid Flow. Fluid Mechanics and Its Applications, vol 101. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54026-7_7
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DOI: https://doi.org/10.1007/978-4-431-54026-7_7
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