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effect of magnetic field on natural convection and entropy generation in Al2O3/water nanofluid-filled enclosure with twin protruding heat sources
Prasanth Anand Kumar Lam,
Published in American Society of Mechanical Engineers (ASME)
2017
Volume: 9
   
Issue: 2
Abstract
In this paper, the effect of magnetic field on natural convection of Al2O3/water nanofluid in an enclosure containing twin protruding heat sources placed on top and bottom walls arranged in-line and staggered manner is presented. For this purpose, coupled equations governing fluid flow and heat transfer are solved in Cartesian framework using streamline upwind/Petrov-Galerkin (SUPG) finite element method. Numerical computations are performed to predict the fluid flow, heat transfer, and entropy generation for a wide range of Hartmann number (0.0 ≤ Ha ≤ 100.0), Rayleigh number (103 ≤ Ra ≤ 106), and nanoparticle volume fraction (0:0 ≤ / ≤ 0:1). The simulated results indicate that, for both in-line and staggered arrangement, the entropy generation due to heat transfer is significant along isothermal surfaces, whereas entropy generation due to fluid friction is higher at noslip walls and along the regions of contact between adjacent recirculation cells. For both in-line and staggered arrangement, increase in global total entropy generation and average Nusselt number along top and bottom heat sources is obtained with decreasing Ha and increasing Ra. Furthermore, for both in-line and staggered arrangement, variation in global total entropy generation and average Nusselt number along top and bottom heat sources with increasing nanoparticle volume fraction, depend on both Ha and Ra. © 2017 by ASME.
About the journal
JournalJournal of Thermal Science and Engineering Applications
PublisherAmerican Society of Mechanical Engineers (ASME)
ISSN19485085
Open AccessNo
Concepts (20)
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    Aluminum
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    Enclosures
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    Finite element method
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    Flow of fluids
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    Heat transfer
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    Magnetic fields
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    Nanofluidics
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    Nanoparticles
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    Natural convection
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    Nusselt number
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    Volume fraction
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    EFFECT OF MAGNETIC FIELD
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    Entropy generation
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    Fluid flow and heat transfers
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    ISOTHERMAL SURFACES
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    NANOPARTICLE VOLUME FRACTIONS
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    Numerical computations
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    RECIRCULATION CELLS
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    STAGGERED ARRANGEMENT
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    Entropy