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DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.690
pages 929-940

Chahra Abdellahoum
University of Science and Technology, Theoretical and Applied Fluid Mechanics Laboratory, USTHB

Amina Mataoui
Laboratoire de Mécanique des Fluides Théorique et Appliquée - Faculté de Physique Université des Sciences et de la Technologie Houari Boumediene


Separated and reattaching flow over a rectangular cavity of aspect ratio Ar between the width and height of 10 is investigated in this work. However, the elongated cavity believes as a backward forward facing step pair. Heat transfers in separated flows are frequently encountered in various engineering applications, such as heat exchangers, axial and centrifugal compressor blades, gas turbines blades, and microelectronic circuit boards. Thus, it is very essential to understand the mechanisms of heat transfer in such regions in order to enhance heat transfer. Different volume fractions of nanoparticles of two types of nanoparticles are used. The governing equations were discretized by the finite volume method based one point closure of two equations turbulence model. Our objective is to understand the effect of nanofluid on heat transfer in such configuration. Numerical simulations are performed for pure water and two nanofluids (Cu and Al2O3). The results are analyzed through the thermal and dynamical fields with a special interest to the Nusselt number evolution. It was found an increase in average Nusselt number with the volume fraction of nanoparticles for all range of Reynolds number. The average Nusselt number versus Reynolds number and volume fraction of each type of nanoparticles over the cavity wall are investigated in this paper.

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