Influence of vortex on heat transfer enhancement in triangular grooved channel by pulsating flow

被引：0
|
作者：
Huang Q. [1 ]
Wang X. [1 ]
Yang Z. [1 ]
Zhong Y. [1 ]
机构：
[1] Engineering Research Center of Pulse Technology, Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang
来源：
Zhong, Yingjie (zhong_yingjie@zjut.edu.cn) | 1600年 / Materials China卷 / 67期
关键词：
Experimental measurement; Heat transfer; Laminar flow; Numerical analysis; Pulsating flow; Synergy; Vortex;
D O I：
10.11949/j.issn.0438-1157.20160231
中图分类号：
学科分类号：
摘要：
In this paper, heat transfer enhancement in the triangular grooved channel by a laminar pulsating flow is studied. The influence of several main parameters on heat transfer enhancement is analyzed. The parameters are Reynolds number, Strouhal number and pulsation amplitude. The experimental results show that the enhancement of heat transfer rate increases with the Reynolds number and pulsation amplitude, and there exists an optimal Strouhal number for the greatest enhancement of heat transfer in the triangular grooved channel. To analyze the correlation between the pulsating flow behaviors and the heat transfer enhancement characteristics, the PIV investigation is performed. The PIV results show that the heat transfer enhancement results from the strong mixing caused by the repeating sequence of vortex generation, growth, expansion and ejection from the groove to the main stream by the pulsating flow. The repeating sequence of vortex variation changes the flow pattern, which leads to destroy the boundary layer and make the mixing speed faster in the different zones. What's more, the numerical research has been conducted to investigate the synergy of the temperature, velocity and pressure fields on the laminar pulsating flow in a triangular grooved channel. The numerical results indicate that an increase of the intersection angle between velocity and pressure gradient improves the synergy between the velocity and pressure fields with an equal heat transfer enhancement, resulting in a reduction of penalty of pressure drop. Therefore, the improvement of three-field synergy is the basic mechanism for the heat transfer enhancement in the triangular grooved channel by a laminar pulsating flow. © All Right Reserved.
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页码：3616 / 3624
页数：8
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共 20 条
  • [1] Lin Z.H., Wang J., Li R.Y., Et al., The Technology of Heat Transfer Augmentation, (2007)
  • [2] Tao H.J., Seo Y.K., Jae M.H., Experiments on heat transfer enhancement from a heated square cylinder in a pulsating channel flow, International Journal of Heat and Mass Transfer, 51, 5-6, pp. 1130-1138, (2008)
  • [3] Mohammad J., Mousa F., Kurosh S., Pulsating flow effects on convection heat transfer in a corrugated channel: a LBM approach, International Communications in Heat and Mass Transfer, 45, 7, pp. 146-154, (2013)
  • [4] Himadri C., Franz D., Subhashis R., Analysis of heat transfer in simultaneously developing pulsating laminar flow in a pipe with constant wall temperature, International Communications in Heat and Mass Transfer, 33, 4, pp. 475-481, (2006)
  • [5] Jin D.X., Lee Y.P., Lee D.Y., Effects of the pulsating flow agitation on the heat transfer in a triangular grooved channel, Heat Mass and Transfer, 50, pp. 3062-3071, (2007)
  • [6] He Y.L., Yang W.W., Zhao C.F., Et al., Numerical study on enhancing heat transfer by pulsating flow, Journal of Engineering Thermophysics, 26, 3, pp. 495-497, (2005)
  • [7] Lu H.X., Ma X.J., Zhao L., Research advancements of heat transfer enhancement by pulsating flow, Energy Conservation Technology, 26, 148, pp. 168-172, (2008)
  • [8] Jia B.J., Sun F.M., Bian Y.N., Et al., Numerical simulation of pulsatile flow and mass transfer enhancement in a wavy-walled tube, CIESC Journal, 60, 1, pp. 6-12, (2009)
  • [9] Yin J.X., Yang G., Guo R., Et al., Numerical calculation of fluid flow and heat transfer in asymmetrical wavy channels, Journal of Taiyuan University of Technology, 42, 1, pp. 20-24, (2011)
  • [10] Li Y., Jin D.X., Jing Y.Q., Et al., An experiment investigation of heat transfer enhancement by pulsating laminar flow in rectangular grooved channels, Advanced Materials Research, 732, 733, pp. 74-77, (2013)
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