THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

External Links

Murat Tekelioğlu

EMPIRICAL MAPPING OF THE CONVECTIVE HEAT TRANSFER COEFFICIENTS WITH LOCAL HOT SPOTS ON HIGHLY CONDUCTIVE SURFACES

ABSTRACT
An experimental method was proposed to assess the natural and forced convective heat transfer coefficients on highly conductive bodies. Experiments were performed at air velocities of 0m/s, 4.0m/s, and 5.4m/s, and comparisons were made between the current results and available literature. These experiments were extended to arbitrary-shape bodies. External flow conditions were maintained throughout. In the proposed method, in determination of the surface convective heat transfer coefficients, flow condition is immaterial, i.e., either laminar or turbulent. With the present method, it was aimed to acquire the local heat transfer coefficients on any arbitrary conductive shape. This method was intended to be implemented by the heat transfer engineer to identify the local heat transfer rates with local hot spots. Finally, after analyzing the proposed experimental results, appropriate decisions can be made to control the amount of the convective heat transfer off the surface. Limited mass transport was quantified on the cooled plate.
KEYWORDS
Arbitrary shape, conductive body, local spot, natural convection, forced convection
PAPER SUBMITTED: 2014-11-06
PAPER REVISED: 2015-04-25
PAPER ACCEPTED: 2015-09-26
PUBLISHED ONLINE: 2015-11-15
DOI REFERENCE: https://doi.org/10.2298/TSCI141106153T
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE Issue 3, PAGES [1231 - 1240]
REFERENCES
  1. Chen, C. -K. and Chen, C. -H., Nonuniform Porosity and Non-Darcian Effects on Conjugate Mixed Convection Heat Transfer from a Plate Fin in Porous Media, International Journal of Heat and Fluid Flow, 11 (1990), 1, pp. 65-71
  2. Sun, C., Yu, B., Oztop, H. F., Wang, Y., and Wei, J., Control of Mixed Convection in Lid-Driven Enclosures Using Conductive Triangular Fins, International Journal of Heat and Mass Transfer, 54 (2011), 4, pp. 894-909
  3. Hsiao, K. -L. and Hsu, C. -H., Conjugate Heat Transfer of Mixed Convection for Viscoelastic Fluid Past a Horizontal Flat-Plate Fin, Applied Thermal Engineering, 29 (2009), 1, pp. 28-36
  4. Isaac, S. and Barnea, Y., Simple Analysis of Mixed Convection with Uniform Heat Flux, International Journal of Heat and Mass Transfer, 29 (1986), 8, pp. 1139-1147
  5. Chen, T. S., Tien, H. C., and Armaly, B. F., Natural Convection on Horizontal, Inclined, and Vertical Plates with Variable Surface Temperature or Heat Flux, International Journal of Heat and Mass Transfer, 29 (1986), 10, pp. 1465-1478
  6. Higuera, F. J. and Ryazantsev, Y. S., Natural Convection Flow Due to a Heat Source in a Vertical Channel, International Journal of Heat and Mass Transfer, 45 (2002), 10, pp. 2207-2212
  7. Yian, L. Y., Amin, N., and Pop, I., Mixed Convection Flow Near a Non-orthogonal Stagnation Point Towards a Stretching Vertical Plate, International Journal of Heat and Mass Transfer, 50 (2007), 23-24, pp. 4855-4863
  8. Shih, T. -M., Thamire, C., and Zhang, Y., Heat Convection Length for Boundary-layer Flows, International Communications in Heat and Mass Transfer, 38 (2011), 4, pp. 405-409
  9. Hassani, A. V. and Hollands, K. G. T., Prandtl Number Effect on External Natural Convection Heat Transfer from Irregular Three-Dimensional Bodies, International Journal of Heat and Mass Transfer, 32 (1989), 11, pp. 2075-2080
  10. Al-Sanea, S. A., Mixed Convection Heat Transfer Along a Continuously Moving Heated Vertical Plate with Suction or Injection, International Journal of Heat and Mass Transfer, 47 (2004), 6-7, pp. 1445-1465
  11. Yang, Y. -T. and Wang, S. -J., Free Convection Heat Transfer of Non-Newtonian Fluids Over Axisymmetric and Two-dimensional Bodies of Arbitrary Shape Embedded in a Fluid-saturated Porous Medium, International Journal of Heat and Mass Transfer, 39 (1996), 1, pp. 203-210
  12. Bianco, N. and Nardini, S., Numerical Analysis of Natural Convection in Air in a Vertical Convergent Channel with Uniformly Heated Conductive Walls, International Communications in Heat and Mass Transfer, 32 (2005), 6, pp. 758-769
  13. Wilks, G., External Natural Convection About Two-dimensional Bodies with Constant Heat Flux, International Journal of Heat and Mass Transfer, 15 (1972), 2, pp. 351-354
  14. Yovanovich, M. M., General Expression for Forced Convection Heat and Mass Transfer from Isopotential Spheroids, Proceedings of the AIAA 26th Aerospace Sciences Meeting, Reno, Nevada, 1998, AIAA 88-0743
  15. Hassani, A. V. and Hollands, K. G. T., A Simplified Method for Estimating Natural Convection Heat Transfer from Bodies of Arbitrary Shape, Proceedings of the ASME 87-HT-11 National Heat Transfer Conference, Pittsburg, Pennsylvania, USA, 1987
  16. Nakayama, A. and Shenoy, A., Turbulent Free Convection Heat Transfer to Power-law Fluids from Arbitrary Geometric Configurations, International Journal of Heat and Fluid Flow, 12 (1991), 4, pp. 336-343
  17. Lee, S. L. and Lin, D. W., Transient Conjugate Heat Transfer on a Naturally Cooled Body of Arbitrary Shape, International Journal of Heat and Mass Transfer, 40 (1997), 9, pp. 2133-2145
  18. Sepa Aluminum and Metal, www.sepa.com.tr
  19. Cem Instruments, www.cem-instruments.com
  20. Pico Technology, thermocouple, www.picotech.com/thermocouples.html
  21. Pico Technology, datalogger, www.picotech.com/thermocouple.html
  22. Lienhard IV, J. H. and Lienhard V, J. H., A Heat Transfer Textbook, third edition, Phlogiston Press, Massachusetts, USA, 2003, p. 309
  23. Bergman, T. L., Lavine, A. S., Incropera, F. P., and Dewitt, D. P., Fundamentals of Heat and Mass Transfer, seventh edition, John Wiley and Sons Inc., New Jersey, USA, 2011, pp. 446, 1008
  24. Taylor, J. R., An Introduction to Error Analysis: The Study of Uncertainties in Physical Measurements, second edition, University Science Books, California, USA, 1997, p. 75
PDF VERSION [DOWNLOAD]
Empirical mapping of the convective heat transfer coefficients with local hot spots on highly conductive surfaces

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, 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