Visual Criteria for Measuring Two phase Flow Rate in Venturi with Flow Homogenizer

Abstract

A simple use of Venturi might be used to measure twophase flow rate within relatively low GVF(gas volume fraction). Upstream flow entering Venturi can be improved with installed flow homogenizer which is easily fabricated by 3dimensional printer with multiple holes. Simultaneous measurement between highspeed flow visualization and dynamic differential pressure measurement was made to find visual criteria for twophase flow rate measurement with different GVF ranged from 0% to 30%. It was observed that the twophase flow rate can be reliably measured up to 15% of GVF using flow homogenizer. FFT(FastFourier Transform) results proved that the long flow homogenizers (type 2 and 4) showed a lower amplitude of differential pressure (خ”p) than the short flow homogenizers (type 1 and 3) respectively. So the optimized flow homogenizer can be useful to measure twophase flow rate at low GVF.