대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제33권6호
  • /
  • Pages.427-434
  • /
  • 2009
  • /
  • 1226-4881(pISSN)
  • /
  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지
DOI QR코드

DOI QR Code

내부 냉각유로에서 열전달 강화와 압력손실 감소를 위한 표면 형상체의 개발

Development of a Surface Shape for the Heat Transfer Enhancement and Reduction of Pressure Loss in an Internal Cooling Passage

  • 두정훈 (부산대학교 기계공학부 대학원) ;
  • 윤현식 (부산대학교 첨단조선공학연구센터) ;
  • 하만영 (부산대학교 기계공학부)
  • 발행 : 2009.06.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

A new surface shape of an internal cooling passage which largely reduces the pressure drop and enhances the surface heat transfer is proposed in the present study. The surface shape of the cooling passage is consisted of the concave dimple and the riblet inside the dimple which is protruded along the stream-wise direction. Direct Numerical Simulation (DNS) for the fully developed turbulent flow and thermal fields in the cooling passage is conducted. The numerical simulations for five different surface shapes are conducted at the Reynolds number of 2800 based on the mean bulk velocity and channel height and Prandtl number of 0.71. The driving pressure gradient is adjusted to keep a constant mass flow rate in the x direction. The thermoaerodynamic performance for five different cases used in the present study was assessed in terms of the drag, Nusselt number, Fanning friction factor, volume and area goodness factor in the cooling passage. The value of maximum ratio of drag reduction is -22.86 %, and the value of maximum ratio of Nusselt number augmentation is 7.05% when the riblet angle is $60^{\circ}$. The remarkable point is that the ratio of Nusselt number augmentation has the positive value for the surface shapes which have over $45^{\circ}$ of the riblet angle. The maximum volume and area goodness factors are obtained when the riblet angle is $60^{\circ}$.

키워드

참고문헌

  1. Afanasyev, V. N., Chudnovsky, Y. P., Leontiev, A. I. and Roganov, P. S., 1993, 'Turbulent Flow Friction and Heat Transfer Characteristics for Spherical Cavities on a Flat Plate,' Experimental Thermal and Fluid Science, No. 7, pp. 1-8 https://doi.org/10.1016/0894-1777(93)90075-T
  2. Moon, H.K., O'Connell, T. and Glezer , B., 2000, 'Channel Height Effect on Heat Transfer and Friction in a Dimpled Passage,' Journal of Engineering for Gas Turbines and Power, No. 122, pp. 307-313 https://doi.org/10.1115/1.483208
  3. Mahmood, G.I. and Ligrani, P.M., 2002, 'Heat Transfer in a Dimpled Channel: Combined Influences of Aspect Ratio, Temperature, Reynolds Number, and Flow Structure,' International Journal of Heat and Mass Transfer, No. 45, pp. 2011-2020 https://doi.org/10.1016/S0017-9310(01)00314-3
  4. Ligrani, P. M., Harrison, J. L., Mahmmod, G. I. and Hill, M. L., 2001, 'Flow Structure due to Dimple Depressions on a Channel Surface,' Physics of Fluids, Vol. 13, pp. 3442-3451 https://doi.org/10.1063/1.1404139
  5. Ligrani, P. M., Mahmmod, G. I., Harrison, J. L., Clayton, C. M. and Nelson, D. L., 2001, 'Flow Structure and Local Nusselt Number Variations in a Channel with Dimples and Protrusions on Opposite Walls,' International Journal of Heat and Mass Transfer, Vol. 44, pp. 4413-4425 https://doi.org/10.1016/S0017-9310(01)00101-6
  6. Isaev, S. A. and Leont'ev, A. I., 2003, 'Numerical Simulation of Vortex Enhancement of Heat Transfer Under Conditions of Turbulent Flow Past a Spherical Dimple on the Wall of a Narrow Channel,' High Temperature, Vol. 41, No.5, 665-679 https://doi.org/10.1023/A:1026100913269
  7. Won, S. Y., Zhang, Q. and Ligrani, P, M., 2005, 'Comparisons of Flow Structure Above Dimpled Surfaces with Different Dimple Depths in a Channel,' Physics of Fluids, Vol. 17, 045105 https://doi.org/10.1063/1.1872073
  8. Isaev, S. A., Leont'ev, A. I. and Baranov, P. A., 2007, 'Simulating Tornado-Like Enhancement of Heat Transfer Under Low-Velocity Motion of Air in a Rectangular Dimpled Channel. Part 2: Results of Parametric Studies,' Thermal Engineering, Vol. 54, No. 8, pp. 655-663 https://doi.org/10.1134/S0040601507080101
  9. Shah, R. K. and London, A. L., 1978, 'Laminar Flow Forced Convection in Ducts,' Academic Press, Inc. New York
  10. You, J., Choi, H. and Yoo, J. Y., 2000, 'Modified Fractional Step Method of Keeping a Constant Mass Flow Rate in Fully Developed Channel and Pipe Flows,' KSME International Journal, Vol. 14, No. 5, pp. 547-552
  11. Elyyan, M.A., Rozati, A. and Tafti, D.K., 2008, 'Investigation of Dimpled FNS for Heat Transfer Enhancement in Compact Heat Exchanger,' International Journal of Heat and Mass Transfer, Vol. 51, pp. 2950-2966 https://doi.org/10.1016/j.ijheatmasstransfer.2007.09.013
  12. Kim, J., Moin, P. and Moser, R., 1987, 'Turbulent Statistics in Fully Developed Channel Flow at Low Reynolds Number,' Journal of Fluid Mechanics, Vol. 177, pp. 133-166 https://doi.org/10.1017/S0022112087000892
  13. Wang, Z., Yeo, K.S. and Khoo, B.C., 2006, 'DNS of Low Reynolds Number Turbulent Flows in Dimpled Channels,' Journal of Turbulence, No. 7, pp. 1-31 https://doi.org/10.1080/14685240600595735

피인용 문헌

  1. vol.13, pp.1, 2010, https://doi.org/10.5293/KFMA.2010.13.1.063