THERMAL SCIENCE

International Scientific Journal

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
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 5, PAGES [1309 - 1316]
REFERENCES
  1. Ostrach, S., Natural Convection in Enclosures. ASME Journal of Heat Transfer, 110 (1988), 4B, pp. 1175-1190
  2. De Vahl, Davis, G., Natural convection of air in a square cavity a bench mark numerical solution. International Journal for Numerical Methods in Fluids, 3 (1983), 3, pp. 249-264
  3. Hsu, T. H., Chen, C. K., Natural convection of micropolar fluids in a rectangular enclosure, International Journal of Engineering Science, 34 (1996), 4, pp. 407-415
  4. Wan, D. C., Patnaik, B. S. V., Wei, G. W., A New Benchmark Quality Solution for the Buoyancy- Driven Cavity by Discrete Singular Convolution, Numerical Heat Transfer Part B - Fundamentals, 40 (2001), 3, pp. 199-228
  5. Mahmud, S., et al., Free Convection in an Enclosure with Vertical Wavy Walls, International Journal of Thermal Sciences, 41 (2002), 5, pp. 440-446
  6. Rostami, J., Unsteady Natural Convection in an Enclosure with Vertical Wavy Walls, Heat and Mass Transfer, 44 (2008), 9, pp. 1079-1087
  7. Oztop, H. F., et al., Natural Convection in Wavy Enclosures with Volumetric Heat Sources, International Journal of Thermal Sciences, 50 (2011), 4, pp. 502-514
  8. Choi, S. U. S., Enhancing Thermal Conductivity of Fluids with Nanoparticles. in: Developments and Applications of NonNewtonian Flows (Eds. D. A. Siginer, H. P. Wang), ASME, FED-231/MD-66 (1995) pp. 99-105
  9. Das, S. K., Choi, S. U. S., Patel, H. E., Heat Transfer in Nanofluids - a Review, Heat Transfer Engineering, 27 (2006), 10, pp. 3-19
  10. Kakac, S., Pramuanjaroenkij, A., Review of Convective Heat Transfer Enhancement with Nanofluid, International Journal of Heat and Mass Transfer, 52 (2009), 13-14, pp. 3187-3196
  11. Oztop, H. F., Abu-Nada, E., Numerical Study of Natural Convection in Partially Heated Rectangular Enclosures Filled with Nanofluids, International Journal of Heat and Fluid Flow, 29 (2008), 5, pp. 1326-1336
  12. Thomas, P. D., Middlecoff, J. F., Direct Control of the Grid Point Distribution in Meshes Generated by Elliptic Equations, AIAA Journal, 18 (1980), 6, pp. 652-656
  13. Yau, H. T., et al., A Numerical Investigation into Electroosmotic Flow in Microchannels with Complex Wavy Surfaces, Thermal Science, 15 (2011), Suppl. 1, pp. S87-S94
  14. Cho, C. C., Chen, C. L., Chen, C. K., Electrokinetically-Driven nonNewtonian Fluid Flow in Rough Microchannel with Complex-Wavy Surface, Journal of NonNewtonian Fluid Mechanics, 173-174 (2012), 1, pp. 13-20
  15. Patankar, S. V., Numerical Heat Transfer and Fluid Flow, McGraw-Hill, NY, USA, 1980

© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence