Modelling of heat and mass transfer processes in phase transformation cycle of sprayed water into gas: 5. Numerical modelling optimization of phase transformation cycle for droplets slipping in gas flow

摘要

Liquid droplet spraying process is very important For thermal technologies. In two-phase flow heat transfer processes between droplets and its carrying gas flow takes place. Together, phase transformations observe on the surface of a droplet. Therefore, the combined heat and mass transfer is typical for sprayed liquid technologies. In order to defme its intensity an interplay transfer interaction must be taken into account. It is influenced by many factors. It is important to distinguish essential factors that allows to defme transfer format and transfer process intensity. Process interaction is closely related with liquid droplet thermal state. For last-mentioned determination the liquid droplet surface T_R and equilibrium evaporation T_(ee) temperatures, as well as dew point temperature T_rt, are very important. Liquid droplets equilibrium evaporation conditions are inikienced by gas parameters and droplets transfer peculiarities while a dew point temperature is defined by liquid vapour component in gas mix ure. At the beginning droplet surface temperature T_(R.0) is equal to the sprayed liquid temperature T_(l,0). These temperatures are determined by each thermal technology specifics.