摘要
对一种周期性带突起纵向内翅片管通道内的流动与传热特性进行了非稳态三维数值模拟。分析了带突起内翅片管通道在进口流速呈正弦波脉动流时其横截面二次涡流在1个脉动周期内的变化规律;得到了内翅片管平均Nu数及阻力系数f在一个脉动流动周期内的变化规律;同时进一步计算分析了不同脉动流脉动频率对内翅片管传热性能及阻力性能的影响。研究表明:在脉动流动的影响下纵向内翅片管的传热能力得到强化,随着脉动频率的增加,纵向内翅片管传热系数的增大幅度逐渐大于阻力系数。
The turbulent pulsating flow and heat transfer in an internally longitudinal protuberant finned tube was numerically investigated by solving unsteady three-dimensional elliptical Navier-Stokes equations. The realized k-c turbulent model was adopted. The dynamic behaviors of velocity flied, average Nussclt number and friction number of the internally longitudinal protuberant finned tube were numerically analyzed in a pulsating period, and it was further investigated by changing the frequency of the pulsating flow. It was found that the intensity of heat transfer enhancement increases with increase of pulsating frequency, while the pressure drop will be increased simultaneously, the intensification of heat transfer in internally longitudinal protuberant finned tube are gradually better than pressure drop with increase of pulsating frequency.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2007年第35期108-112,共5页
Proceedings of the CSEE
基金
西安石油大学博士科研启动经费项目(Z07013)。
关键词
带突起纵向内翅片管
脉动流动
强化传热
数值模拟
internally longitudinal protuberant finned tube
pulsating flow
heat transfer enhancement
numerical simulation
