Heat and mass transfer to decelerating finely atomized sprays

Abstract

Abstract The rate of heat and mass transfer in the nozzle zone of water sprays produced by internal‐mixing pneumatic nozzles and hollow‐cone pressure nozzles was determined for both concurrent and crosscurrent drying air‐flow patterns. The Nusselt numbers for the evaporating drops were correlated by means of the equation proposed by Ranz and Marshall for stationary drops in a moving air flow. Methods of measuring the physical properties of the water‐air system were developed, and special attention was devoted to the determination of drop velocities and air humidity.