TURBULENCE STRUCTURE AND PREDICTION OF INTERFACIAL HEAT AND MASS-TRANSFER IN WAVY-STRATIFIED FLOW

The turbulence structure of the liquid phase near a wavy gas-liquid in terface in stratified flow was experimentally investigated in a 50 mm (H) x 100 min (W) rectangular duct. The characteristic parameters of t he organized motion under the liquid waves such as the frequency of ap pearance and length scale were estimated by using the variable-interva l time-averaging and the photochromic dye activation techniques. These characteristics were used in a hybrid surface renewal-eddy cell model to predict the interfacial heat- and mass-transfer coefficients in st ratified two-phase flow. The predictions for cocurrent and countercurr ent flows agreed reasonably well with experimental data available in t he literature.