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

[+] Author and Article Information
Jungho Lee

Department of Extreme Thermal Systems, Korea Institute of Machinery and Materials, Daejon,305-343, Korea
jungho@kimm.re.kr

Sangho Sohn

Department of Extreme Thermal Systems, Korea Institute of Machinery and Materials, Daejon,305-343, Korea
sangho@kimm.re.kr

Jaebum Park

Department of Extreme Thermal Systems, Korea Institute of Machinery and Materials, Daejon,305-343, Korea
johnpaulpark@kimm.re.kr

Dong-Wook Oh

Department of Mechanical Engineering, Chosun University, Kwangju, 501-759, Korea
dwoh@chosun.ac.kr

Corresponding author.

J. Heat Transfer 137(8), 080911 (Aug 01, 2015) Paper No: HT-15-1248; doi: 10.1115/1.4030475 History: Received March 30, 2015; Revised April 03, 2015; Online June 01, 2015

Abstract

A simple use of Venturi might be used to measure two-phase 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 3-dimensional printer with multiple holes. Simultaneous measurement between high-speed flow visualization and dynamic differential pressure measurement was made to find visual criteria for two-phase flow rate measurement with different GVF ranged from 0% to 30%. It was observed that the two-phase flow rate can be reliably measured up to 15% of GVF using flow homogenizer. FFT(Fast-Fourier Transform) results proved that the long flow homogenizers (type 2 and 4) showed a lower amplitude of differential pressure (Δp) than the short flow homogenizers (type 1 and 3) respectively. So the optimized flow homogenizer can be useful to measure two-phase flow rate at low GVF.

Copyright © 2015 by ASME
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