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

doi:10.3969/j.issn.0253-2778.2020.05.001

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.

Key words: conical heat sink, jet cooling, secondary jet, heat transfer enhancement, numerical simulation

CLC Number:

TK124

LI Hai, TANG Zhiguo, GAO Qing, ZHANG Feng, SONG Anqi. Analysis of heat transfer characteristics of an air jet cooling a conical heat sink[J]. Journal of University of Science and Technology of China, 2020, 50(5): 551-558.

References

［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.

()
()

[1]	ZHANG Xuanxuan, NIU Guoging, LI Yuanzhi. Research on smoke entrainment rate of urban highway tunnel near the fire source area [J]. Journal of University of Science and Technology of China, 2019, 49(4): 329-342.
[2]	PENG Hong, LENG Wei. Progress in the study of subduction initiation [J]. Journal of University of Science and Technology of China, 2017, 47(2): 163-175.
[3]	QIAN Wanyi, YANG Jianzhi, GU Hailin, YAO Mengyun, ZHAO Pu, LIU Minghou. Numerical study on the near wake of a circular disk in shear flows [J]. Journal of University of Science and Technology of China, 2016, 46(10): 853-859.
[4]	LIU Quan, YANG Jianzhi, GU Hailin, QIAN Wanyi, LIU Minghou. Effect of non-condensable gas on convective condensation on a short vertical plate [J]. Journal of University of Science and Technology of China, 2015, 45(5): 397-403.
[5]	LIU Quan, XU Shumin, ZHONG Wei, YANG Jianzhi, LIU Minghou. A heat transfer empirical correlation for the stratospheric airship based on its length-to-diameter ratio [J]. Journal of University of Science and Technology of China, 2013, 43(5): 387-392.
[6]	HUANG Xianjia, TU Ran, YI Jianxin, XIE Qiyuan, JIANG Xi. The main scientific challenges in fire safety research of nuclear power plants [J]. Journal of University of Science and Technology of China, 2013, 43(11): 959-966.
[7]	BI Kun, QIU Rong, JIANG Yong, ZHENG Jingchuan. Reconstruction of a bus fire based on numerical simulation [J]. Journal of University of Science and Technology of China, 2010, 40(4): 387-394.
[8]	WU Wen, HUANG Wei, ZHAO Pinghui, YE Taohong. Study of RANS based flamelet/progress variable turbulent combustion model [J]. Journal of University of Science and Technology of China, 2010, 40(10): 1016-1022.
[9]	HE Xue-chao,,SUN Jin-hua, CHEN Xian-feng, Richard K. K. Yuen. Experimental and numerical study on flame propagation and structure behaviors of methane-air premixed combustion in tube [J]. Journal of University of Science and Technology of China, 2009, 39(4): 419-423.
[10]	TANG Qiong-hui, XU Jin-liang. Analysis and numerical simulation of microheater thermal field [J]. Journal of University of Science and Technology of China, 2009, 39(1): 69-75.