Transit Time Ultrasonic Modelling in Gas/Liquid Intermittent Flow using Slug Existence Conditions and Void Fraction Analysis

S Al-lababidi, M L Sanderson

Abstract:

In this paper, the performance of the clamp-on transit time ultrasonic flowmeter is experimentally investigated in two-phase gas/liquid flow in straight pipes. Experiments on air-water horizontal slug flows in a 50 mm id pipe were conducted over operating conditions covering 0.3-4.0 m/s and 0.6-3.0 m/s gas and liquid superficial velocity ranges, respectively. The mathematical model presented in this paper is an improvement on the previous closure method which was developed by Al-Lababidi & Sanderson. The algorithm of the new mathematical model is based on both the analysis of the slug existence conditions and the statistical signals analysis of the conductivity probes measurements. Minimum and average liquid heights were evaluated using the PDF (Probability Density Function) analysis of conductance probe measurements. Using this approach, it is demonstrated that the ultrasonic clamp-on flowmeter provides good agreement with mathematical correlations for predicting the slug body velocity with ± 5 %.
Download:

IMEKO-TC9-2004-090.pdf
DOI:

_unreg_tc9-2004.090

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