DEVELOPMENT AND APPLICATION OF MULTI-WAVE UVP AND PIV MEASUREMENT METHODS TO MEASUREMENTS OF SINGLE-PHASE AND BUBBLY TWO-PHASE FLOWS IN A VERTICAL PIPE

Summary Two advanced measurement methods, i.e. multi-wave UVP (ultrasonic velocity profi le) and PIV (particle image velocimetry) methods have been developed and applied to the measurement of single-phase and bubbly two-phase fl ows in a vertical pipe. These are non-intrusive measurement methods which are able to measure the instantaneous velocity profi le and 2D velocity fi eld. Thanks to the instantaneously measured velocity profi le of single-phase and two-phase fl ows the characteristics and behaviour of single-phase and two-phase fl ows can be clarifi ed. Relevant fl ow parameters can be obtained. The multi-wave UVP method, which is highly compact and able to work with opaque fl uids and containers, is expected to be applied to the practical measurement of instantaneous velocity profi les, fl ow rate and local void fraction, etc., in industrial piping systems in operations such as oil and gas two-phase fl ows with the presence of deposition, crystalisation and corrosion. Therefore, it could be a very useful measurement tool in the oil and gas and power generating industries.