Kostyuk O. Contact heat and mass transfer in a running two-phase layer of contact heat recycler of exhaust gases.

The dissertation is dedicated to experimental investigation directed of increasing efficiency of contact heat and mass transfer apparatus at the expense of increasing velocity of heat-carrier and surface contact of two-phase flow. Experimental studies of hydrodynamic characteristics of two-phase flow are presented. The influence of such factors are studied: mode parameters way of gas feed, geometrical parameters of the channel. The limits of steady two-phase mode are determined. It is shown that efficiency of heat and mass transfer is dependent on density of irrigation, velocity of gas-steam mixture and initial steam content. The value of maximum temperature of heating water is found in conditions of bubbling mode. Correlation between maximum density of irrigation and maximal thermal capacity of contact heat recycler is offered. The results of experimental studies of heat and mass transfer in a vertical pipe of co-current flow of closed vapor-gas inclusion and cooling water are presented. It is shown that exchange processes take place on an initial hydrodynamic and thermal area. High intensity of heat and mass transfer is confirmed, summarizing correlations are got. The empirical formulas for the calculation of medium heat and mass transfer coefficient are recommended. Methods of contact apparatus calculations are proposed on the base of experimental investigation hydrodynamic, heat and mass transfer when condensing steam from gas-steam mixture in upward co-current flow with liquid in running bubbling layer flow. Key words: upward co-current flow, gas-steam mixture, bubbling layer flow, contact heat and mass transfer, two-phase flow.