Entropy Analysis of Mixed Convective Condensation by Evaluating Fan Velocity With a New Approach

2018 ◽  
Vol 10 (5) ◽  
Author(s):  
Dipanka Bhuyan ◽  
Asis Giri ◽  
Pradip Lingfa
Keyword(s):  
Entropy Generation ◽  
Parallel Plate ◽  
Numerical Study ◽  
Channel Length ◽  
Entropy Analysis ◽  
New Approach ◽  
Central Focus ◽  
Plate Channel ◽  
Convective Condensation ◽  
Velocity Channel

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.

Effect of Cylinder Aspect Ratio and Channel Dimensions on the Fluid Flow and Heat Transfer in Parallel-Plate Channel Heat Exchangers

2002 ◽  
Author(s):  
A. K. Saha ◽  
Sumanta Acharya
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Aspect Ratio ◽  
Heat Exchangers ◽  
Parallel Plate ◽  
Numerical Study ◽  
Three Dimensional ◽  
Channel Height ◽  
Flow And Heat Transfer ◽  
Plate Channel

A comparative numerical study has been carried out to analyze the unsteady three-dimensional flow and heat transfer in a parallel-plate channel heat exchangers with in-line arrays of periodically mounted square cylinders (pins) at various Reynolds number and geometrical configurations. The geometry considered represents the narrow trailing edge region of the blade where pin fins are used to serve both a structural and a heat transfer role. The three-dimensional unsteady Navier-Stokes and energy equations are solved using higher order temporal and spatial discretizations. The simulations have been carried out for a range of Reynolds number based on cylinder width (180–600) and a Prandtl number of 6.99 (corresponding to water). Conjugate heat transfer calculations have been employed to account for the conduction in the solid cylinder and convection in the fluid. The thermal performance factor (TPF) increases significantly when the flow becomes unsteady. The choice of aspect ratio of the cylinders is judged by their relative increase in friction factor and heat transfer at transitional Reynolds number. The TPF is found to increase with the increase in pitch of the cylinders. The increase in channel height enhances the TPF though the heat transfer decreases at higher channel height.

Entropy generation during a phase-change process in a parallel plate channel

2009 ◽  
Vol 489 (1-2) ◽  
pp. 70-74 ◽  
Author(s):  
Mehmet F. Orhan ◽  
Aytunc Erek ◽  
Ibrahim Dincer
Keyword(s):  
Phase Change ◽  
Entropy Generation ◽  
Change Process ◽  
Parallel Plate ◽  
Phase Change Process ◽  
Plate Channel
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