EVALUATION OF THE RELAXATION-TIME OF HEAT AND MASS-EXCHANGE IN THE LIQUID-VAPOR BUBBLE FLOW

The paper presents a method of evaluation of a time constant that desc ribes relaxational heat exchange between vapour bubbles and superheate d liquid. The Scriven equation of bubble growth solved in a numerical way is used to determine the temperature field in the surroundings of the growing bubble. However, initial and boundary conditions are diffe rent from those studied before. The heat transfer relaxation time is d etermined from variations of the average temperature of the superheate d liquid surrounding the bubble. Calculations are performed in both Eu ler's and Lagrange's descriptions. The relaxation time obtained in the present paper is compared with the relaxation time reevaluated from t he Moby Dick experiment by means of the homogeneous relaxation model.