Wall shear stress and mass transfer in vertical two‐component flow

Abstract

Mass transfer rates in vertical gas‐liquid flow were measured by an electrochemical technique. The flow regimes studied were slug, churn and annular. Average mass transfer coefficients in gas‐liquid flow could be correlated by expressions similar to those for single phase flow. Fluctuations in local mass transfer coefficient could be used to indicate flow regimes. Average wall shear stress determined from the average mass transfer coefficients agreed with values calculated from measurements of pressure drop, void fraction and flow rate, provided flow reversals did not occur. The results indicate that the electrochemical technique could be used to measure wall shear stress in accelerating gas‐liquid flows, such as critical flow.

Heat and Mass Transfer and Wall Shear Stress in Vertical Gas-Liquid Flow

“…These methods are based on the assumption of analogy between momentum and heat transfer. Investigations devoted to studying the relationship between heat or mass transfer and hydraulic resistance in two-phase flows are few in number, and they are contradictory [6][7][8][9][10][11]. To test experimentally an analogy between heat or mass transfer and momentum it is basically important to measure the coefficients of heat or mass transfer and wall shear under similar flow conditions.…”