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Q1(Year 2015)
ISSN : 1026-3098
e-ISSN : 2345-3605
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Publication Information : Volume 23 - Number 5 - Successive Number 5
Type : Article
Topics of Paper : Transaction on Mechanical Engineering
English Title : Numerical study of conjugate heat transfer in laminar and turbulent nano fluid flow in double pipe heat  exchangers
English Abstract : In this paper, the conjugate heat transfer for water-Al2O3 nano fluid flow in double pipe heat exchangers was numerically modeled. The important parameters such as temperature distribution, local heat transfer coecient, pressure drop, and the heat transfer rate in inner and outer fluids were evaluated and compared. All the obtained results were simultaneously analyzed for parallel and counter flows, laminar and turbulent flows, and the presence or absence of nano fluid. The nano fluid flow was modeled by employing a twophase mixture method. The ndings indicate that parallel or counter flows have a more signi cant e ect on the heat transfer performance in the laminar flow than the turbulent one. The results also show that for warming a cold fluid, the most e ective mechanism is to use nano fluids in the tube containing the warm fluid. Similarly, for cooling a warm fluid, the most ecient method is to use nano fluids in the tube containing the cold fluid (using the nano fluid in the other tube).
English Keywords : Nano fluid; Double pipe heat exchanger; Turbulent flow; Heat transfer enhancement; Mixture model.
Refrences :
Number Of Pages :
From 2211 to 2219


Authors :
The AuthorAuthor SequenceOrganizationOrganization ( english )AffiliationEmailEducation
H. Safikhani
(Author)
1Department of Mechanical Engineering, Faculty of Engineering, Arak University, Arak, P.O. Box 38156-88349, Iran.    
M. Ahmari 2Department of Mechanical Engineering, Faculty of Engineering, Arak University, Arak, P.O. Box 38156-88349, Iran.    
E. Azadehfar 3Department of Mechanical Engineering, Faculty of Engineering, Arak University, Arak, P.O. Box 38156-88349, Iran.    
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2014
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2013
Transactions on Civil Engineering
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