THERMAL SCIENCE

International Scientific Journal

Ching-Chang Cho

,

Her-Terng Yau

,

Cha'o-Kuang Chen

NUMERICAL INVESTIGATION INTO NATURAL CONVECTION HEAT TRANSFER ENHANCEMENT OF COPPER-WATER NANOFLUID IN A WAVY WALL ENCLOSURE

ABSTRACT
Numerical investigations are performed into the natural convection heat transfer characteristics within a wavy-wall enclosure filled with Cu-water nanofluid. In the paper, the bottom wall of the enclosure has a wavy geometry and is maintained at a constant high temperature, while the top wall is straight and is maintained at a constant low temperature. The left and right walls of the enclosure are both straight and insulated. In performing the simulation, the Boussinesq approximation is used to model the governing equations. The study examines the effect of the nanoparticle volume fraction, the Rayleigh number, the wave amplitude, and the wavelength on the heat transfer characteristics. It is shown that the heat transfer performance can be enhanced as the volume fraction of nanoparticles increases. It is also shown that for a given Rayleigh number, the heat transfer effect can be optimized via an appropriate changing of the geometry conditions.
KEYWORDS
nanofluid, natural convection, enclosure, heat transfer
PAPER SUBMITTED: 2012-05-30
PAPER REVISED: 2012-08-03
PAPER ACCEPTED: 2012-09-12
DOI REFERENCE: https://doi.org/10.2298/TSCI1205309C
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2012, VOLUME 16, ISSUE Issue 5, PAGES [1309 - 1316]
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Numerical investigation into natural convection heat transfer enhancement of copper-water nanofluid in a wavy wall enclosure

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