0
Research Papers

Double Diffusive Natural Convection Heat Transfer Enhancement in a Square Enclosure Using Nanofluids

[+] Author and Article Information
Javad Abolfazli Esfahani

Department of Mechanical Engineering, Ferdowsi University of Mashhad, 91775-1111 Mashhad, Iranabolfazl@um.ac.ir

Vahid Bordbar

Department of Mechanical Engineering, Ferdowsi University of Mashhad, 91775-1111 Mashhad, Iran

J. Nanotechnol. Eng. Med 2(2), 021002 (May 13, 2011) (9 pages) doi:10.1115/1.4003794 History: Received February 16, 2011; Revised March 03, 2011; Published May 13, 2011; Online May 13, 2011

Double-diffusive natural convection flow in square enclosure filled with nanofluid is studied in this paper. Water based nanofluid containing various nanoparticles including Cu, Ag, Al2O3, and TiO2 is used in the numerical analysis. The upper and lower walls of the enclosure are well insulated and impermeable and the left and right walls are imposed to constant temperatures and concentration. Laminar regime under steady state condition is considered. The Maxwell–Garnett model is used to predict the ratio of thermal conductivity. The system of conservation equations consisting of continuity, momentum, energy, and solute concentration in dimensionless form are solved by using finite volume SIMPLE algorithm. Results are presented for different values of the governing parameters Rayleigh and Lewis number, in terms of streamlines, isotherms, isoconcentration, local Nusselt number, and local Sherwood number. The effect of nanoparticle volume fractions are also discussed on heat transfer characteristics in the cavity.

FIGURES IN THIS ARTICLE
<>
Copyright © 2011 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Schematic diagram of the problem

Grahic Jump Location
Figure 2

Local Nusselt number (left) and local Sherwood number (right) along the heated wall, for different Cu nanoparticle volume fractions, Ra=105 and (a) Le=1.0, (b) Le=2.0, and (c) Le=5.0

Grahic Jump Location
Figure 3

Local Nusselt number (left) and local Sherwood number (right) along the heated wall, for different Cu nanoparticle volume fractions, Ra=105 and (a)Le=1.0, (b) Le=2.0, and (c) Le=5.0

Grahic Jump Location
Figure 4

Streamlines, isotherms, and isoconcentrations for φ=0 (solid lines), φ=0.05 (dashed lines), φ=0.1 (dash-dot-dot lines), Ra=105, and (a) Le=1.0, (b) Le=2.0, and (c) Le=5.0

Grahic Jump Location
Figure 5

Streamlines, isotherms, and isoconcentrations for φ=0 (solid lines), φ=0.05 (dashed lines), φ=0.1 (dash-dot-dot lines), Ra=106, and (a) Le=1.0, (b) Le=2.0, and (c) Le=5.0

Grahic Jump Location
Figure 6

Average Nusselt number (left) and average Sherwood number on the heated wall with Cu volume fraction for different Lewis numbers at Ra=105

Grahic Jump Location
Figure 7

Average Nusselt number (left) and average Sherwood number on the heated wall with Cu volume fraction for different Lewis numbers at Ra=106

Grahic Jump Location
Figure 8

Average Nusselt number (left) and average Sherwood number on the heated wall with Cu volume fraction for different Rayleigh numbers at Le=2.0

Grahic Jump Location
Figure 9

Average Nusselt number (left) and average Sherwood number on the heated wall with volume fraction for different nanoparticles at Le=2.0 and Ra=106

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In