每年出版 4 期
ISSN 打印: 1065-3090
ISSN 在线: 1940-4336
Indexed in
A TIME-AVERAGED TECHNIQUE FOR GAS-LIQUID FLOW STRUCTURE RECONSTRUCTION FROM LOCAL VOID FRACTION MEASUREMENTS
摘要
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.