Heat and Mass Transfer of Countercurrent Air-Water Flow in a Vertical Tube

The paper deals with the classification and the design features of direct contact heat exchangers used in various technological processes. It describes the existing two-phase flow regimes and the methods for heat and mass transfer prediction in heat exchangers with the direct contact of fluids in a vertical tube. The authors carried out the measurements of heat and mass transfer coefficients during the liquid film flow under the action of gravity towards the air flow in a vertical tube. The range of experimental variables is set to be the following: air mass flow rate is 1·10-3-4·10-3 kg/s, air inlet temperature is 26-28 °C, air inlet humidity is 38-50