有序涡旋对三角槽道脉动流强化传热的影响

doi:10.11949/j.issn.0438-1157.20160231

化工学报 ›› 2016, Vol. 67 ›› Issue (9): 3616-3624.DOI: 10.11949/j.issn.0438-1157.20160231

有序涡旋对三角槽道脉动流强化传热的影响

黄其, 王勋廷, 杨志超, 钟英杰

浙江工业大学能源与动力工程研究所脉动技术工程研究中心, 浙江杭州 310014

收稿日期:2016-03-02 修回日期:2016-05-11 出版日期:2016-09-05 发布日期:2016-09-05
通讯作者: 钟英杰
基金资助:
浙江省科技厅资助项目（2014C31034）。

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

HUANG Qi, WANG Xunting, YANG Zhichao, ZHONG Yingjie

Engineering Research Center of Pulse Technology, Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China

Received:2016-03-02 Revised:2016-05-11 Online:2016-09-05 Published:2016-09-05
Supported by:
supported by the Funded Project of Science Technology Department in Zhejiang Province (2014C31034).

摘要/Abstract

摘要：

以水为工质对三角槽道内单相液体充分发展层流脉动传热特性进行了研究。应用粒子图像测速技术（PIV）测得流场内涡的变化规律，从“涡及涡运动”的角度揭示了“有序”的涡生长及迁移过程对脉动流强化传热的影响。此外，应用“场协同”理论，通过数值模拟深入分析了流场特性与传热之间的关系。研究发现，“有序”的涡生长及迁移过程，破坏了流体边界层，促进了近壁区热流场与速度场的协同，同时，强化了三角槽道内流体与主流区流体的掺混，热量输运能力提升；存在最佳的Strouhal数（St），使得涡旋既能充分发展又能在较短时间脱落进入主流，实现最大效率的壁面换热；有序涡旋对速度场、温度梯度场以及压力梯度场三者协同性的改善是换热性能提升的关键。

关键词: 传热, 脉动流, 层流, 涡, 协同性, 实验测量, 数值分析

Abstract:

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.

Key words: heat transfer, pulsating flow, laminar flow, vortex, synergy, experimental measurement, numerical analysis

中图分类号:

TK11

黄其, 王勋廷, 杨志超, 钟英杰. 有序涡旋对三角槽道脉动流强化传热的影响[J]. 化工学报, 2016, 67(9): 3616-3624.

HUANG Qi, WANG Xunting, YANG Zhichao, ZHONG Yingjie. Influence of vortex on heat transfer enhancement in triangular grooved channel by pulsating flow[J]. CIESC Journal, 2016, 67(9): 3616-3624.

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有序涡旋对三角槽道脉动流强化传热的影响

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

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