Abstract
Experimental studies are made on the effect of liquid film to gas-phase turbulence modification on air-water annular flow in vertically arranged round tube. Gas-phase turbulence structure and characteristics such as time- averaged velocity profile, fluctuation velocity profile, power spectrum, and auto-correlation coefficient are quantitatively measured by using the hot-wire anemometer. Measured values are quantitatively examined and compared with the single-phase flow. Followings are noted. (1) Time-averaged velocity profiles are modified to sharpened shape compared with single-phase flow. (2) Fluctuation velocity in axial direction becomes larger than that of single-phase flow through the all-radial position. (3) Turbulence in annular flow is modified to coherent structure, which should be affected by gas-liquid periodically moving wavy interface.
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