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 haracteristics within a wavy-wall enclosure filled with Cu-water nanofluid. In he paper, the bottom wall of the enclosure has a wavy geometry and is maintained t a constant high temperature, while the top wall is straight and is maintained t a constant low temperature. The left and right walls of the enclosure are oth straight and insulated. In performing the simulation, the Boussinesq approximation s used to model the governing equations. The study examines the effect f the nanoparticle volume fraction, the Rayleigh number, the wave amplitude, nd the wavelength on the heat transfer characteristics. It is shown that the heat ransfer performance can be enhanced as the volume fraction of nanoparticles ncreases. It is also shown that for a given Rayleigh number, the heat transfer effect an be optimized via an appropriate changing of the geometry conditions.

Keywords

Dates

  • Submission Date2012-05-30
  • Revision Date2012-08-03
  • Acceptance Date2012-09-12

DOI Reference

10.2298/TSCI1205309C

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
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