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CN 34-1054/N

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Analysis of heat transfer characteristics of an air jet cooling a conical heat sink

  • School of Mechanical Engineering, Hefei University of Technology, Hefei 230009, China

Cite this:
https://doi.org/10.3969/j.issn.0253-2778.2020.05.001
  • Received Date: 04 December 2018
  • Accepted Date: 05 April 2019
  • Rev Recd Date: 05 April 2019
  • Publish Date: 31 May 2020
    Abstract

  • Abstract

    The heat transfer characteristics of a single air jet to cool conical heat sinks with different conical angles were studied by numerical simulation. The Transition SST turbulence model was adopted to solve the Navier-Stokes equation. The difference of heat transfer between different locations was analyzed in combination with flow characteristics. The results show that introducing a conical protrusion greatly enhances the heat transfer near the stagnation point. The average heat transfer performances of cone heat sinks with small angles are better than that of flat heat sinks. And the smaller the angle, the better the heat transfer enhancement. At the bottom edge of the cone, the heat transfer has been weakened first and then enhanced, which is caused by flow separation and secondary jet respectively.

    Abstract

    The heat transfer characteristics of a single air jet to cool conical heat sinks with different conical angles were studied by numerical simulation. The Transition SST turbulence model was adopted to solve the Navier-Stokes equation. The difference of heat transfer between different locations was analyzed in combination with flow characteristics. The results show that introducing a conical protrusion greatly enhances the heat transfer near the stagnation point. The average heat transfer performances of cone heat sinks with small angles are better than that of flat heat sinks. And the smaller the angle, the better the heat transfer enhancement. At the bottom edge of the cone, the heat transfer has been weakened first and then enhanced, which is caused by flow separation and secondary jet respectively.
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    • References(21)
  • [1]
    MARTIN H. Heat and mass transfer between impinging gas jets and solid surfaces[J]. Advances in Heat Transfer, 1977, 13 : 1-60.
    [2]
    POLAT S, HUANG B, MUJUMDAR A S, et al. Numerical flow and heat transfer under impinging jets: A review[J]. Annual Review of Heat Transfer, 1989, 2(2): 157-197.
    [3]
    JAMBUNATHAN K, LAI E, MOSS M A, et al. A review of heat transfer data for single circular jet impingement[J]. International Journal of Heat and Fluid Flow, 1992, 13(2): 106-115.
    [4]
    LI Yongping, ZHANG Liang, LIN Qizhao, et al. Large eddy simulation of normally impinging round air-jet heat transfer at moderate Reynolds numbers[J]. Heat Transfer Engineering, 2017, 38(17): 1439-1448.
    [5]
    吴峰，王秋旺．脉动流条件下带突起内翅片管强化传热数值研究[J]．中国电机工程学报，2007，27(35)：108-112．
    [6]
    崔海亭，袁修干，姚仲鹏，等．异形凹槽螺旋槽管传热及流动阻力的实验研究[J]．中国电机工程学报，2003，23(6)：217-220．
    [7]
    HRYCAK P. Heat transfer from impinging jets to a flat plate with conical and ring protuberances[J]. International Journal of Heat and Mass Transfer, 1984, 27(11): 2145-2154.
    [8]
    WANG J, WANG X. The heat transfer optimization of conical fin by shape modification[J]. Chinese Journal of Chemical Engineering, 2016, 24(8): 972-978.
    [9]
    ALAM T, KIM M H. Heat transfer enhancement in solar air heater duct with conical protrusion roughness ribs[J]. Applied Thermal Engineering, 2017, 126: 458-469.
    [10]
    YEMIN O, WAE-HAYEE M, NARATO P, et al. The effect of conical dimple spacing on flow structure and heat transfer characteristics of internal flow using CFD[J]. IOP Conference Series: Materials Science and Engineering, 2017, 243： 012002.
    [11]
    GUAN T, ZHANG J Z, SHAN Y. Conjugate heat transfer on leading edge of a conical wall subjected to external cold flow and internal hot jet impingement from chevron nozzle-Part 2: Numerical analysis[J]. International Journal of Heat and Mass Transfer, 2017,106: 339-355.
    [12]
    GUAN T, ZHANG J Z, SHAN Y, et al. Conjugate heat transfer on leading edge of a conical wall subjected to external cold flow and internal hot jet impingement from chevron nozzle-Part 1: Experimental analysis[J]. International Journal of Heat and Mass Transfer, 2017, 106: 329-338.
    [13]
    马鹏程，唐志国，刘轻轻，等. 新型单圆锥体热沉单孔射流散热数值模拟[J]. 机械工程学报，2016，52(24)：136-141.
    [14]
    周嘉，唐志国，闵小滕，等. 微小单锥体热沉射流流动及换热特性研究[J]. 工程热物理学报，2017，38(11)：2399-2407.
    [15]
    TANG Z G, LIU Q Q, LI H, et al. Numerical simulation of heat transfer characteristics of jet impingement with a novel single cone heat sink[J]. Applied Thermal Engineering, 2017,127: 906-914.
    [16]
    ANSYS, Inc. Fluent 14.5: User’s Guide[M]. Canonsburg, PA, USA: ANSYS, Inc., 2012.
    [17]
    ELEBIARY K, TASLIM M E. Experimental/numerical crossover jet impingement in an airfoil leading-edge cooling channel[C]// ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. New York: ASME, 2011: 1397-1409.
    [18]
    BHAGWAT A B, SRIDHARAN A. Numerical simulation of oblique air jet impingement on a heated flat plate[J]. Journal of Thermal Science and Engineering Applications, 2016, 9(1): 011017.
    [19]
    YANG L, REN J, JIANG H D, et al. Experimental and numerical investigation of unsteady impingement cooling within a blade leading edge passage[J]. International Journal of Heat and Mass Transfer, 2014, 71: 57-68.
    [20]
    ZHANG D, QU H C, LAN J B, et al. Flow and heat transfer characteristics of single jet impinging on protrusioned surface[J]. International Journal of Heat and Mass Transfer, 2013, 58(1/2): 18-28.
    [21]
    LEE D H, CHUNG Y S, KIM D S. Turbulent flow and heat transfer measurements on a curved surface with a fully developed round impinging jet[J]. International Journal of Heat and Fluid Flow, 1997, 18(1): 160-169.)
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    [1]
    MARTIN H. Heat and mass transfer between impinging gas jets and solid surfaces[J]. Advances in Heat Transfer, 1977, 13 : 1-60.
    [2]
    POLAT S, HUANG B, MUJUMDAR A S, et al. Numerical flow and heat transfer under impinging jets: A review[J]. Annual Review of Heat Transfer, 1989, 2(2): 157-197.
    [3]
    JAMBUNATHAN K, LAI E, MOSS M A, et al. A review of heat transfer data for single circular jet impingement[J]. International Journal of Heat and Fluid Flow, 1992, 13(2): 106-115.
    [4]
    LI Yongping, ZHANG Liang, LIN Qizhao, et al. Large eddy simulation of normally impinging round air-jet heat transfer at moderate Reynolds numbers[J]. Heat Transfer Engineering, 2017, 38(17): 1439-1448.
    [5]
    吴峰，王秋旺．脉动流条件下带突起内翅片管强化传热数值研究[J]．中国电机工程学报，2007，27(35)：108-112．
    [6]
    崔海亭，袁修干，姚仲鹏，等．异形凹槽螺旋槽管传热及流动阻力的实验研究[J]．中国电机工程学报，2003，23(6)：217-220．
    [7]
    HRYCAK P. Heat transfer from impinging jets to a flat plate with conical and ring protuberances[J]. International Journal of Heat and Mass Transfer, 1984, 27(11): 2145-2154.
    [8]
    WANG J, WANG X. The heat transfer optimization of conical fin by shape modification[J]. Chinese Journal of Chemical Engineering, 2016, 24(8): 972-978.
    [9]
    ALAM T, KIM M H. Heat transfer enhancement in solar air heater duct with conical protrusion roughness ribs[J]. Applied Thermal Engineering, 2017, 126: 458-469.
    [10]
    YEMIN O, WAE-HAYEE M, NARATO P, et al. The effect of conical dimple spacing on flow structure and heat transfer characteristics of internal flow using CFD[J]. IOP Conference Series: Materials Science and Engineering, 2017, 243： 012002.
    [11]
    GUAN T, ZHANG J Z, SHAN Y. Conjugate heat transfer on leading edge of a conical wall subjected to external cold flow and internal hot jet impingement from chevron nozzle-Part 2: Numerical analysis[J]. International Journal of Heat and Mass Transfer, 2017,106: 339-355.
    [12]
    GUAN T, ZHANG J Z, SHAN Y, et al. Conjugate heat transfer on leading edge of a conical wall subjected to external cold flow and internal hot jet impingement from chevron nozzle-Part 1: Experimental analysis[J]. International Journal of Heat and Mass Transfer, 2017, 106: 329-338.
    [13]
    马鹏程，唐志国，刘轻轻，等. 新型单圆锥体热沉单孔射流散热数值模拟[J]. 机械工程学报，2016，52(24)：136-141.
    [14]
    周嘉，唐志国，闵小滕，等. 微小单锥体热沉射流流动及换热特性研究[J]. 工程热物理学报，2017，38(11)：2399-2407.
    [15]
    TANG Z G, LIU Q Q, LI H, et al. Numerical simulation of heat transfer characteristics of jet impingement with a novel single cone heat sink[J]. Applied Thermal Engineering, 2017,127: 906-914.
    [16]
    ANSYS, Inc. Fluent 14.5: User’s Guide[M]. Canonsburg, PA, USA: ANSYS, Inc., 2012.
    [17]
    ELEBIARY K, TASLIM M E. Experimental/numerical crossover jet impingement in an airfoil leading-edge cooling channel[C]// ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. New York: ASME, 2011: 1397-1409.
    [18]
    BHAGWAT A B, SRIDHARAN A. Numerical simulation of oblique air jet impingement on a heated flat plate[J]. Journal of Thermal Science and Engineering Applications, 2016, 9(1): 011017.
    [19]
    YANG L, REN J, JIANG H D, et al. Experimental and numerical investigation of unsteady impingement cooling within a blade leading edge passage[J]. International Journal of Heat and Mass Transfer, 2014, 71: 57-68.
    [20]
    ZHANG D, QU H C, LAN J B, et al. Flow and heat transfer characteristics of single jet impinging on protrusioned surface[J]. International Journal of Heat and Mass Transfer, 2013, 58(1/2): 18-28.
    [21]
    LEE D H, CHUNG Y S, KIM D S. Turbulent flow and heat transfer measurements on a curved surface with a fully developed round impinging jet[J]. International Journal of Heat and Fluid Flow, 1997, 18(1): 160-169.)
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