Thermodynamics of spray evaporation

Abstract
An exergy and anergy balance in the process of spray evaporation in hot gas surroundings has been made to determine the second law efficiency of the process. The law of entropy generation in droplet evaporation (from the authors' earlier work) has been taken as the fundamental information for evaluating the entropy generation rate due to evaporation of the dispersed phase in the spray. The entropy generation rate due to transport processes in the carrier phase has been evaluated from a two-phase separated flow model of the spray. A theoretical model for exergy analysis of the process of spray evaporation has been developed to predict the second law efficiency of the process in terms of pertinent controlling parameters like free stream temperature, initial Reynolds number and initial drop size distribution of the spray.

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