Fundamental Study of the UVP Flow Measurement of Narrow Gap Flow

抄録

In this research, the ultrasonic velocity profile (UVP) measurement method is applied to the narrow gap flow inside the radiator. A fundamental study of UVP flow measurements in simulated radiator samples was carried out with the aim of understanding flow and phase variations in the radiator. An understanding of the flow conditions in a radiator will lead to an improvement in the performance of heat exchange. However, it is difficult to measure the flow rate inside the narrow gap of a stainless-steel radiator. Laser Doppler Velocimetry (LDV) and Image Processing Velocimetry (PIV, PTV) are widely used fluid velocity measurement methods, but they are difficult to apply to measurements in vessels with small capacities because of the need for an optical measurement window. This research focuses on real-time flow measurement methods that employ ultrasound, which does not necessitate the use of an optical measurement window and can be applied to opaque liquids. A narrow gap flow sample composed of PVC resin and stainless-steel plate was manufactured to simulate a narrow gap in stainless-steel radiators. It could be used to verify the feasibility and accuracy of using UVP to measure stainless steel radiators. At the same time, PIV measurements are also used to measure the flow in the sample. The accuracy of UVP flow measurements in narrow gaps has been verified through a comparison between UVP measurement results and PIV measurement results.