摘要
通过数值模拟计算,研究低振动雷诺数下横纹管内脉冲流流动和换热.数值计算结果表明:脉冲流动引起出口压力正(余)弦波动,波动幅度随脉冲流振幅、频率的增大而增大;脉冲流动能够使流体在低速和低振动雷诺数下产生漩涡,并周期性生成、迁移和脱落;由于漩涡的作用,增强了流体的径向扰动和相对扰动,增大了横纹管内壁切应力,引起壁面切应力的周期性变化,减薄边界层,增强流体质量、能量输运;随着脉冲流振幅的增加,强化传热系数最高可以达到1.97.
In this paper,the flow and heat transfer of pulsating flow under low vibrational Reynolds number in a transverse tube were studied through numerical simulation method.The results showed that： the sine（or cosine） fluctuation of outlet pressure was produced by pulsating flow,furthermore,the fluctuate scope increased with increasing amplitude and frequency of pulsating flow;under low velocity and low vibrational Reynolds number,the vortices were induced to generate,migrate and shed periodically by pulsating flow;due to the growing of vortices,radial and mutual disturbance of flow were aggravated and flow boundary layer was thinner,therefore,the mass and energy transfer were enhanced;with the increasing amplitude of pulsating flow,the maximum enhanced heat transfer coefficient can reach 1.97.
出处
《武汉工程大学学报》
CAS
2011年第5期89-93,共5页
Journal of Wuhan Institute of Technology
基金
国家自然科学基金(No.50976080)
关键词
横纹管
脉冲流
换热
流动
transverse tube
pulsating flow
heat transfer
flow field
