THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

External Links

Vadim Dubovsky

,

Ruth Letan

AIR FORCED CONVECTION OVER A TWO-SIDED PLATE EXTENDED BY RECTANGULAR HOLLOW BLOCKS

ABSTRACT
Our work focuses on an array of hollow blocks formed on a two-sided plate, inserted in a rectangular channel, heated and exposed to forced convection of air at room temperature. The thermal performance of the extended surface of the plates is investigated within a range of air velocities and power input. The investigation is conducted experimentally, using an infrared camera, and numerically in a 3-D computational domain. The experimental results and the numerical calculations showed quantitatively a satisfactory agreement. As expected, the heat transfer rates significantly increased as the air velocity in the channel increased. At low velocities the thermal performance of the extended plate compared to the performance of a flat plate. A numerical analysis of the extensions size and the ratio of plate height to width were also carried out and its effect upon the thermal performance of the system was examined. Relation between fluid pressure losses and heat transfer was studied and generalized. The application of the surfaces extended by blocks is found in several industries, for example in electronic equipment, solar industry, and others.
KEYWORDS
extended surface, rectangular blocks, forced convection, numeric analysis, correlations, infrared visualization
PAPER SUBMITTED: 2019-01-12
PAPER REVISED: 2019-02-26
PAPER ACCEPTED: 2019-04-08
PUBLISHED ONLINE: 2019-09-22
DOI REFERENCE: https://doi.org/10.2298/TSCI19S4251D
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Supplement 4, PAGES [S1251 - S2160]
REFERENCES
  1. Sparrow, E. M., et al., Heat Transfer and Pressure Drop Characteristics of Arrays of Rectangular Modules Encountered in Electronic Equipment, Int. J. Heat and Mass Transfer, 25 (1982), 7, pp. 961-973
  2. Chang, W. J., You, Y. D., Hot Block Elevation Effect on Mixed Convection in a Parallel Plate Channel, Numer. Heat Transfer, 29 (1996), Part A, pp. 297-312
  3. Kim, S. H., Anand, N. K., Turbulent Heat Transfer Between a Series of Parallel Plates with Surface-Mounted Discrete Heat Sources, ASME J. Heat Transfer, 116 (1994), 3, pp. 577-587
  4. Davalath, J., Bayazitoglu, Y., Forced Convection Cooling Across Rectangular Blocks, ASME J. Heat Transfer, 109, (1987), 2, pp. 321-328
  5. Asako, Y., Faghri, M., Three-Dimensional Heat Transfer Analysis of Arrays of Heated Square Blocks, Int. J. of Heat and Mass Transfer, 32 (1989), 2, pp. 395-405
  6. Chen, Y. M., Wang, K. C., Simulation and Measurement of Turbulent Heat Transfer in a Channel with a Surface-Mounted Rectangular Heated Block, Heat Mass Transfer, 31 (1996), 6, pp. 463-473
  7. Jacobi, A. M., Shan, R. K., Air-Side Flow and Heat Transfer in Compact Heat Exchangers: A Discussion of Enhancement Mechanisms, Heat Transfer Engineering, 19 (1998), 4, pp. 29-41
  8. Wong, H., Peck, R. E., Experimental Evaluation of Air-Cooling Electronics at High Altitudes, ASME J. Electron. Packaging, 123 (2001), 4, pp. 357-365
  9. Sara, O.N., et al., Enhancement of Heat Transfer From a Flat Surface in a Channel Flow by Attachment of Rectangular Blocks, Int. J. of Energy Research, 25 (2001), 7, pp. 563-576
  10. Ryu, D. N., et al., Analysis of Turbulent Flow in Channels Roughened by 2-D Ribs and 3-D Blocks, Part II: Heat Transfer, Int. J. of Heat and Fluid Flow, 28 (2007), 5, pp. 1112-1124
  11. Tsay, Y. L., Cheng, J. C., Analysis of Convective Heat Transfer Characteristics for a Channel Containing Short Multi-Boards Mounted with Heat Generating Blocks, Int. J. of Heat and Mass Transfer, 51 (2008), 1-2, pp. 145-154
  12. Nakamura, H., Igarashi, T., Forced Convection Heat Transfer from a Low-Profile Block Simulating a Package of Electronic Equipment, ASME J. Heat Transfer 126 (2004), 3, pp. 463-470
  13. Yemenici, O., Umur, H., Experimental Aspects of Heat Transfer Enhancement over Various Flow Surfaces, Heat Transfer Engineering, 37 (2016), 5, pp. 435-442
  14. Buyruk, E., Karabulut, K., Enhancement of Heat Transfer for Plate Fin Heat Exchangers Considering the Effects of Fin Arrangements, Heat Transfer Engineering, 39 (2018), 15, pp. 1392-1404
  15. Srinivasan, S., et al., Heat Transfer Measurements inside Narrow Channels with Ribs and Trenches, Heat Transfer Engineering, 39 (2018), 9, pp. 750-759
  16. Holman, J., Heat Transfer, 10th edition, McGraw-Hill, New York, USA, 2010
PDF VERSION [DOWNLOAD]
Air forced convection over a two-sided plate extended by rectangular hollow blocks

© 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