Present paper conducts an extensive numerical study on entropy analysis of mixed convective condensation inside a vertical parallel plate channel. A new approach is proposed to separate pump velocity component/Reynolds number from inlet mixed convection velocity. Influence of inlet governing parameters on condensation heat and mass transfer at different inlet pressure, velocity, channel length, and width are widely studied. The central focus of this paper is to study entropy generation under mixed convective condensation. Variation of local as well as overall entropy generation and second law efficiency for different geometric and environmental conditions are presented. For effective condenser design, present study provides two important correlations of overall volumetric entropy generation due to thermal transport and overall volumetric entropy generation due to mass transport.
An attempt has been made to investigate the performance of two methods of estimation of free and forced convection velocity components present in mixed convection. For this present analysis, a vertically configured shrouded plate finned channel is considered. From the literature, it is observed that in the solution of mixed convection problems related to the various engineering applications, proper estimation of induced velocity and fan/pump velocity plays a vital role. For this cause, segregation of the velocity components of free and forced convection present in the mixed convection becomes important. There exist two methods available in the literature, namely, the natural convection computational fluid dynamics method used in the mixed convection computational fluid dynamics analysis under the same thermal and geometrical condition, and secondly forced convection decoupled method applying the same pressure drop in forced and mixed convection across the channel. Results of this study reveal that if the free or induced velocity component present in the mixed convection is assessed based on the forced convection decoupled method, the pumping power results may be more precise than the natural convection computational fluid dynamic method as in the later method calculation of the forced convection velocity component is underpredicted. A correlation of overall Nusselt number is suggested for a vertically configured shrouded dual-height plate finned channel evaluating appropriate Reynolds number through forced convection decoupled method.
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