Title : ( Numerical investigation of effective parameters in convective heat transferof nanofluids flowing under a laminar flow regime )
Authors: Ehsan Ebrahimnia Bajestan , Hamid Niazmand , Weerapun Duangthongsuk , Somchai Wongwises ,
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Abstract
This article presents a numerical investigation on heat transfer performance and pressure drop of nanofluids flows through a straight circular pipe in a laminar flow regime and constant heat flux boundary condition. Al2O3, CuO, carbon nanotube (CNT) and titanate nanotube (TNT) nanoparticles dispersed in water and ethylene glycol/water with particle concentrations ranging between 0 and 6 vol.% were used as working fluids for simulating the heat transfer and flow behaviours of nanofluids. The proposed model has been validated with the available experimental data and correlations. The effects of particle concentrations, particle diameter, particles Brownian motions, Reynolds number, type of the nanoparticles and base fluid on the heat transfer coefficient and pressure drop of nanofluids were determined and discussed in details. The results indicated that the particle volume concentration, Brownian motion and aspect ratio of nanoparticles similar to flow Reynolds number increase the heat transfer coefficient, while the nanoparticle diameter has an opposite effect on the heat transfer coefficient. Finally, the present study provides some considerations for the appropriate choice of the nanofluids for practical applications. 2011 Elsevier Ltd. All rights reserved
Keywords
Nanofluids Heat transfer performance Pressure drop Numerical study Thermal conductivity
@article{paperid:1023279,
author = {Ebrahimnia Bajestan, Ehsan and Niazmand, Hamid and Weerapun Duangthongsuk and Somchai Wongwises},
title = {Numerical investigation of effective parameters in convective heat transferof nanofluids flowing under a laminar flow regime},
journal = {International Journal of Heat and Mass Transfer},
year = {2011},
volume = {54},
number = {19},
month = {September},
issn = {0017-9310},
pages = {4376--4388},
numpages = {12},
keywords = {Nanofluids
Heat transfer performance
Pressure drop
Numerical study
Thermal conductivity},
}
%0 Journal Article
%T Numerical investigation of effective parameters in convective heat transferof nanofluids flowing under a laminar flow regime
%A Ebrahimnia Bajestan, Ehsan
%A Niazmand, Hamid
%A Weerapun Duangthongsuk
%A Somchai Wongwises
%J International Journal of Heat and Mass Transfer
%@ 0017-9310
%D 2011
