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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN 印刷: 1065-3090
ISSN オンライン: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v11.i2.30
20 pages

A TIME-AVERAGED TECHNIQUE FOR GAS-LIQUID FLOW STRUCTURE RECONSTRUCTION FROM LOCAL VOID FRACTION MEASUREMENTS

Volfango Bertola
Laboratory of Technical Physics, School of Engineering, University of Liverpool, Brownlow Hill, Liverpool L69 3GH, UK

要約

The structure of gas-liquid, two-phase flow is studied by means of a time-averaged tomographic technique, which provides a representation of the local flow structure on a given cross section. Single-fiber optical probes, sensitive to the refractive index of the surrounding medium, were used to measure the local void fraction distribution, which corresponds to the time-averaged gas concentration. The spatial resolution was enhanced by bi-harmonic spline interpolation of the experimental data; the flow structure in a generic position between two reference cross sections was obtained by linear interpolation. The proposed measurement technique was applied to the investigation of an air-water intermittent flow in horizontal pipes of large diameters (0.06 and 0.08 m i.d.). The water mass flow rate was 3 kg/s, while the gas fraction of volume flow ranged from 20% to 85%. Test sections with a constant diameter and with a sharp-edged abrupt area contraction were used.


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