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Heat Transfer Research
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2015007542
pages 795-818

NUMERICAL STUDY OF THE HYDROTHERMAL BEHAVIOR AND EXERGY DESTRUCTION OF MAGNETIC NANOFLUID IN CURVED RECTANGULAR MICROCHANNELS

Mousa Mohammadpourfard
University of Tabriz
Sajjad Ahangar Zonouzi
Department of Mechanical Engineering, Razi University Kermanshah, Iran
F. Mohseni
Institute for Building Materials, Computational Physics for Engineering Materials, ETH Zurich, Switzerland

ABSTRACT

This paper presents a numerical investigation of entropy generation and exergy destruction of a magnetic nanofluid in curved rectangular microchannels. The microchannels with different aspect ratios and curvatures have been studied using two-phase mixture model and control volume technique. Additionally the effect of a nonuniform transverse magnetic field on exergy destruction has been investigated. Based on the results obtained, it is found that the aspect ratio of the microchannels plays a considerable role in the entropy generation for the same length of microchannels. The total entropy generation also decreases with increasing curvature of the microchannels. It has also been shown that adding Fe3O4 nanoparticles to the base fluid decreases the entropy generation due to heat transfer irreversibilities. Furthermore, the total entropy generation decreases considerably on applying a nonuniform transverse magnetic field.