Abstract
The paper presents the results of the experimental study of a downward bubbly flow in a vertical pipe with an inner diameter of 20 mm. The water-glycerol solution was used as the test liquid. The experiments were carried out for different values of Reynolds numbers from 500 to 1500. Measurements of the local flow characteristics (void fraction, liquid velocity, shear stress) were performed using an electrochemical method. The experiments showed a strong effect of the gas phase on the flow structure, expressed in an increase in wall shear stress and a flattening of the velocity profile in the central part of the tube. A significant deviation from a single-phase flow occurs even at low gas-liquid flow ratios.
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