International Journal of Aeronautical and Space Sciences

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Heat Transfer and Frictions in the Convergent/divergent Channel with Λ/V-shaped Ribs on Two Walls

  • Kim, Beom-soo (Department of Mechanical and System Engineering, Gyeongsang National University) ;
  • Lee, Myung-sung (Evaluation Team, Gyeongnam Institute for Regional Program Evaluation) ;
  • Ahn, Soo-whan (Department of Mechanical and System Engineering, Institute of Marine Industry, Gyeongsang National University)
  • Received : 2016.12.20
  • Accepted : 2017.08.02
  • Published : 2017.09.30
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Abstract

The local heat transfer and total pressure drops of developed turbulent flows in the ribbed rectangular convergent/divergent channels with ${\Lambda}/V-shaped$ ribs have been investigated experimentally. The channels have the exit hydraulic diameter ($D_{ho}$) to inlet hydraulic diameter ($D_{hi}$) ratios of 0.67 for convergence and 1.49 for divergence, respectively. The ${\Lambda}/V-shaped$ ribs with three different flow attack angles of $30^{\circ}$, $45^{\circ}$, and $60^{\circ}$ are manufactured with a fixed rib height (e) of 10 mm and the ratio of rib spacing (S) to height (e) of 10 on the walls. Thermal performances of the ribbed rectangular convergent/divergent channels are compared with the smooth straight tube under identical pumping power. The results show that the flow attack angle of $45^{\circ}$ with ${\Lambda}-shaped$ rib has the greatest thermal performance at all the Reynolds numbers studied in the convergent channel; whereas, the flow attack angle of $60^{\circ}$ with V-shaped rib has the greatest thermal performance over Reynolds number of 30,000 in the divergent channel.

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References

  1. Ahn, S. W., Kang, H. K., Bae, S. T. and Lee, D. H., "Heat Transfer and Friction Factor in a Square Channel with One, Two, or Four Inclined Ribbed Walls", ASME J. Turbomachinery, Vol. 130, 2008, pp. 034501-5. https://doi.org/10.1115/1.2775488
  2. Han, J. C., "Heat Transfer and Friction in Channels with Two Opposite Rib-Roughened Walls", ASME J. Heat Transfer, Vol. 106, 1984, pp. 774-781. https://doi.org/10.1115/1.3246751
  3. Han, J. C., Glickman, L. R. and Rohsenow, W. M., "An Investigation of Heat Transfer and Friction for Rib- Roughened Surface", International Journal of Heat and Mass Transfer, Vol. 21, 1978, pp. 1143-1156. https://doi.org/10.1016/0017-9310(78)90113-8
  4. Han, J. C., Zhang, Y. M. and Lee, C. L., "Augmented Heat Transfer in Square Channels with Parallel, Crossed, and V-shaped Angled Ribs", ASME J. Heat Transfer, Vol. 113, 1991, pp. 590-596. https://doi.org/10.1115/1.2910606
  5. Lee, M. S., Jeong, S. S., Ahn, S. W. and Han, J. C., "Heat Transfer and Friction in the Rectangular Convergent and Divergent Channels with Ribs", AIAA Journal of Thermophysics and Heat Transfer, Vol. 27, 2013, pp. 660-667. https://doi.org/10.2514/1.T4144
  6. Lee, M. S. and Ahn, S. W., "Heat Transfer and Frictions in the Rectangular Channel with Ribs on One Wall", International Journal of Aeronautical and Space Science, Vol. 17, 2016, pp. 351-356.
  7. Lee, M. S., Jeong, S. S., Ahn, S. W. and Han, J. C., "Effects of Angled Ribs on Turbulent Heat Transfer and Friction Factors in a Rectangular Divergent Channel", International Journal of Thermal Science, Vol. 84, 2014, pp. 1-8. https://doi.org/10.1016/j.ijthermalsci.2014.04.010
  8. Kline, S. J. and McClintock, F. A., "Describing Uncertainties in Single Sample Experiments", Mechanical Engineering, Vol. 75, 1953, pp. 3-8.
  9. White, F. M., Viscous Fluid Flow, McGraw-Hill Inc., New York, 1991, pp. 394-499.