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Heat Transfer Research
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ISSN Print: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2015007328
pages 465-482

MIXED CONVECTION FLUID FLOW AND HEAT TRANSFER OF THE Al2O3−WATER NANOFLUID WITH VARIABLE PROPERTIES IN A CAVITY WITH AN INSIDE QUADRILATERAL OBSTACLE

Mohammad Hemmat Esfe
Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
Amir Hossein Refahi
Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran
Hamid Teimouri
Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran
Mohammaj javad Noroozi
Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran
Masoud Afrand
Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
Arash Karimipour
Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran

ABSTRACT

This investigation is focused on mixed convection fluid flow and heat transfer of Al2O3−water inside a square enclosure containing a hot rectangular obstacle at its bottom wall. The governing equations have been solved using the finite volume method. The SIMPLER algorithm was employed to couple the velocity and pressure fields. Utilizing the developed code, a parametric study was conducted and the impact of important parameters such as the solid volume fraction, Richardson number, size of the hot obstacle on the fluid flow and thermal fields and heat transfer inside the enclosure were investigated. The results show that for all Richardson numbers, the average Nusselt number increases with increase in the volume fraction of nanoparticles. Moreover, at all values of the Richardson number, heat transfer decreases when the height of the heated obstacle increases.


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