Applied Thermal Engineering, ( ISI ), Volume (107), Year (2016-8) , Pages (533-543)

Title : ( Minimization of Exergy Losses in a TrapezoidalDuct with Turbulator, Roughness and Beveled corners )

Authors: SAJJAD AMIR AHMADI , Saman Rashidi , Javad Abolfazli Esfahani ,

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This research is focused on the study of force convective heat and exergy transfers characteristics of flow through a trapezoidal duct with turbulator. Two vortex generators are located in the duct to enhance the heat transfer rate. The numerical simulations are done for the Reynolds numbers in the range of 400<Re<1600. The conservation of mass, momentum, and energy equations are solved numerically by applying a finite volume approach. The results are presented for the friction factor, Nusselt number, and entropy generations(Friction, thermal and total entropy generations). Finally, the attention is focused on the minimization of exergy losses by using two techniques. These techniques were use of bevelled corners and surface roughnessfor the duct. It was found thatthe total entropy generation decreases by installing the vortex generators inside the duct. These reductions are 24.9%, 24.4%, 25.8%, and 26.6% for Re=400, 800, 1200, and 1600, respectively. Moreover, the total entropy generation decreases by using beveled corners for duct. These reductions in the total entropy rates are in the vicinity of 10.4%, 9.15%, 8.54%, and 8.1% for Re=400, 800, 1200, and 1600, respectively.

Keywords

Trapezoidal duct; Exergy; Turbulator;Beveled corners; Surface
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@article{paperid:1057005,
author = {AMIR AHMADI, SAJJAD and Rashidi, Saman and Abolfazli Esfahani, Javad},
title = {Minimization of Exergy Losses in a TrapezoidalDuct with Turbulator, Roughness and Beveled corners},
journal = {Applied Thermal Engineering},
year = {2016},
volume = {107},
month = {August},
issn = {1359-4311},
pages = {533--543},
numpages = {10},
keywords = {Trapezoidal duct; Exergy; Turbulator;Beveled corners; Surface roughness},
}

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%0 Journal Article
%T Minimization of Exergy Losses in a TrapezoidalDuct with Turbulator, Roughness and Beveled corners
%A AMIR AHMADI, SAJJAD
%A Rashidi, Saman
%A Abolfazli Esfahani, Javad
%J Applied Thermal Engineering
%@ 1359-4311
%D 2016

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