On the Mechanism of Liquid Drop Deposition in Two-Phase Dispersed Flow

The deposition motion of liquid drops (the migration of drops toward the wall) in dispersed flow heat transfer is analyzed. Equations of drop motion penetrating the laminar sublayer are derived taking into account inertia forces arising from change in the velocity of drop, drag forces, buoyancy forces, gravity forces, lift forces (forces due to rotation of the drop inside laminar sublayer caused by high vapor velocity gradient) and reaction forces due to asymmetrical drop evaporation inside laminar sublayer. A new expression for the reaction force is derived. The application of the developed drop deposition model is illustrated by calculating several quantities of practical interest for analysis of heat and mass transfer in dispersed systems. Also, the model has been applied to explain the behavior of the dispersed flow boiling heat transfer data.