AERODYNAMICS, HEAT AND MASS TRANSFER IN VAPOUR CONDENSATION FROM HUMID AIR ON A FLAT PLATE IN A LONGITUDINAL FLOW IN ASYMMETRICALLY COOLED SLOT

In the present paper results are reported of a combined experimental study of aerodynamics and heat and mass transfer in the condensation of vapour from humid air on a flat plate in a pre-turbulent region of a longitudinal flow (Re < 10000). The study has been carried out at atmsopheric pressure within the range of air temperatures 18 to 61°C, moisture content 5 to 200 g/kg of dry air and flow velocities 0·5 to 4 m/s. The critical relations describing heat- and mass-transfer processes for laminar and transient flow patterns of humid air are similar when the air parameters are close to those used in industry. Similar directions of heat- and mass-transfer processes when the interface is in a transverse vapour flow led to thinning a boundary layer and hence to intensifying heat transfer in the total process. The complicated nature of the above process allowed separate quantitative estimations of both effects and a subsequent summation of heat- and mass-transfer coefficients to determine the efficiency of newly designed installations. © 1969.