化工学报2016，Vol.67Issue(9)：3616-3624,9.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
Influence of vortex on heat transfer enhancement in triangular grooved channel by pulsating flow
摘要
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.关键词
传热/脉动流/层流/涡/协同性/实验测量/数值分析Key words
heat transfer/pulsating flow/laminar flow/vortex/synergy/experimental measurement/numerical analysis分类
能源科技引用本文复制引用
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):3616-3624,9.基金项目
浙江省科技厅资助项目（2014C31034）。 （）
