中文摘要：

通过数值模拟计算，研究了在螺旋槽管内通入脉冲流后的强化传热机理。结果表明，脉冲流动能引起出口压力呈周期性波动，波动幅度随脉冲流频率的增大而增大；脉冲流动能够使流体在螺旋槽管管壁附近产生漩涡，并出现周期性的生成、漂移和脱落，漩涡的作用增强了流体的径向扰动和相对扰动；脉冲流动能够改善速度场与温度梯度场之间的协同程度，产生强化传热的效果。

英文摘要：

By numerical simulation computation, after passing the pulsating flow, enhanced heat transfer mechanism in spirally fluted tubes was researched. The result shows that pulsating flow can cause the outlet pressure to fluctuate cyclical and the extent of fluctuation increases with the pulsating flow frequency. The pulse flowing can make the fluid generate the whirlpool nearby the spirally fluted tubes and the phenomenon of periodic production, drift, and fall-off appears. Be- cause of the vortex, the fluid motion and relative motion are enhanced. The pulse flowing can im- prove the coordination level between velocity and temperature, thus has strengthened the heat transfer effect.