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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Experimental investigation of air-water two-phase flow through vertical 90° bend
Experimental Thermal and Fluid Science, Volume 57, Year 2014
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Description
The behaviour of two-phase air-water mixture flowing from the horizontal to the vertical through a 90° bend has been investigated experimentally. Cross sectional void fraction at nine positions, three upstream and six downstream of the bend have been measured using a conductance probe technique. The bend, manufactured from transparent acrylic resin has a diameter of 34. mm and a curvature (R/D) equal to 5. The superficial velocity of the air was varied between 0.3 and 4. m/s and that for the water between 0.21 and 0.91. m/s. The characteristics signatures of Probability Density Function (PDF), the Power Spectral Density (PSD) of the time series of cross sectionally average void fraction and visual observations have been used to characterise the flow behaviour. For the experimental conditions, plug, slug and stratified wavy flow pattern occurred in the horizontal pipe while slug and churn flow patterns were present in the vertical pipe. The void fraction increased with the gas superficial velocity. The correlation of Nicklin et al. predicted the structure velocity for the slug flow in both horizontal and vertical pipes reasonably accurately. With regards to the frequency of the periodic structures present, some conditions showed little change from upstream to downstream the bend whilst others showed an increasing in the structure frequency from horizontal to vertical pipe. The slug length increased by passing through the vertical bend. © 2014 Elsevier Inc.
Authors & Co-Authors
Saidj, Faiza
Algeria, Algiers
Université Des Sciences et de la Technologie Houari Boumediene
Kibboua, Rachid
Algeria, Algiers
Université Des Sciences et de la Technologie Houari Boumediene
Azzi, Abdelwahid
Algeria, Algiers
Université Des Sciences et de la Technologie Houari Boumediene
Ababou, Noureddine
Algeria, Algiers
Université Des Sciences et de la Technologie Houari Boumediene
Azzopardi, Barry James
United Kingdom, Nottingham
University of Nottingham
Statistics
Citations: 45
Authors: 5
Affiliations: 2
Identifiers
Doi:
10.1016/j.expthermflusci.2014.04.020
ISSN:
08941777
Research Areas
Environmental
Study Design
Cross Sectional Study