Journal of Enhanced Heat Transfer Theory and Application in High Performance Heat and Mass Transfer

ISSN for PRINT: 1065-5131

For Online Access

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2007, Volume14

Issue 4

111 pages

DOI: 10.1615/JEnhHeatTransf.v14.i4

Issue price - $160.00

Javad Rostami
Mechanical Engineering Department, University of Tehran, Tehran, Iran

In this paper, hydrodynamic and thermal characteristics of forced convection heat transfer for nanofluids through the wavy channels have been investigated numerically. Nanofluid was produced by mixing nanoscale metallic particles of Al₂O₃ and basefluids such as water and ethylene glycol. It is assumed that the wavy channel walls are under constant wall heat flux. The governing equations including the continuity, Navier-Stokes, and energy equations were disceritized using the finite-volume method and then solved by the well-known SIMPLE method in a curvilinear coordinate system. Numerical results were obtained for a range of Reynolds numbers of Re = 100−250 and nanoparticle volume concentration of φ = 0−10% and for two nanofluids, namely water−Al₂O₃ and ethylene glycol−Al₂O₃. It is found that nanofluids have higher pressure drop and heat transfer coefficient compared with traditional fluids (without nanoparticles). It is shown that an increase in the Reynolds number and particle concentration increases the pressure drop and heat transfer coefficient. Also, the pressure drop and the heat transfer coefficient of the ethylene glycol-Al₂O₃ nanofluid are higher than those of the water−Al₂O₃ nanofluid.

DOI: 10.1615/JEnhHeatTransf.v14.i4.60 Download article, 333-352 pages

Article price - $35.00

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