Numerical simulation of laminar to turbulent nanofluid flow and heat transfer over a backward-facing step

Togun, Hussein, Safaei, M. R., Sadri, Rad, Kazi, S. N., Badarudin, A., Hooman, K. and Sadeghinezhad, E. (2014) Numerical simulation of laminar to turbulent nanofluid flow and heat transfer over a backward-facing step. Applied Mathematics and Computation, 239 153-170. doi:10.1016/j.amc.2014.04.051


Author Togun, Hussein
Safaei, M. R.
Sadri, Rad
Kazi, S. N.
Badarudin, A.
Hooman, K.
Sadeghinezhad, E.
Title Numerical simulation of laminar to turbulent nanofluid flow and heat transfer over a backward-facing step
Journal name Applied Mathematics and Computation   Check publisher's open access policy
ISSN 0096-3003
1873-5649
Publication date 2014-07-15
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.amc.2014.04.051
Volume 239
Start page 153
End page 170
Total pages 18
Place of publication Philadelphia, PA United States
Publisher Elsevier
Collection year 2015
Language eng
Abstract This paper presents a numerical study of heat transfer to turbulent and laminar Cu/water flow over a backward-facing step. Mathematical model based on finite volume method with a FORTRAN code is used to solve the continuity, momentum, energy and turbulence equations. Turbulence was modeled by the shear stress transport (SST) K-ω Model. In this simulation, three volume fractions of nanofluid (0%, 2% and 4%), a varying Reynolds number from 50 to 200 for the laminar range and 5000 to 20,000 for the turbulent range, an expansion ratio of 2 and constant heat flux of 4000 W/m2 were considered. The results show the effect of nanofluid volume fraction on enhancing the Nusselt number in the laminar and turbulent ranges. The effect of expansion ratio was clearly observed at the downstream inlet region where the peak of the Nusselt number profile was referred to as enhanced heat transfer due to the generated recirculation flow. An increase of pressure drop was evident with an increasing Reynolds number and decreasing nanofluid volume fraction, while the maximum pressure drop was detected in the downstream inlet region. A rising Reynolds number caused an increasing Nusselt number, and the highest heat transfer augmentation in the present investigation was about 26% and 36% for turbulent and laminar range, respectively compared with pure water.
Keyword Backward-facing step
Nanofluid
Separation flow
Turbulent and laminar flow
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
 
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