Affiliation:
1. Department of Mechanical Engineering, Faculty of Engineering, Gazi University, Maltepe/Ankara, Turkey
Abstract
In this study, steady-state three-dimensional turbulent forced convection
flow and heat transfer characteristics in a circular pipe with baffles
attached inside pipe have been numerically investigated under constant wall
heat flux boundary condition. Numerical study has been carried out for
Reynolds number Re of 3000-50,000, Prandtl number Pr of 0.71, baffle
distances s/D of 1, 2, and 3, and baffle angle a of 30o-150o. Ansys Fluent
12.0.1 software has been used to solve the flow field. It is observed that
circular pipe having baffles has a higher Nusselt number and friction factor
compared to the smooth circular pipe without baffles. Maximum Nusselt number
and friction factor are obtained for the baffle angle of 90o. Nusselt number
increases while baffle distance increases in the range of studied; however,
friction factor decreases. Periodically fully developed conditions are
obtained after a certain module. Thermal performance factor increases with
increasing baffle distance in the rage of studied but decreases with
increasing Reynolds number; maximum thermal performance factor is obtained
for the baffle angle of 150?. Results show that baffle distance, baffle
angle, and Reynolds number play important role on both flow and heat transfer
characteristics. The accuracy of the results obtained in this study is
verified by comparing the results with those available in the literature for
smooth circular pipes. All the numerical results are correlated within
accuracy of ?10 and ?15% for average Nusselt number and Darcy friction
factor, respectively.
Publisher
National Library of Serbia
Subject
Renewable Energy, Sustainability and the Environment
Cited by
13 articles.
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