混沌对流强化传热的场协同分析

基于采用周期性计算模型得到的混沌对流流道内的流体流动与传热数值计算结果,应用场协同原理,对混沌对流内强化传热进行分析.分析了混沌流道截面上流场与温度场的协同关系,讨论了流道内不同雷诺数下Nusselt数与平均流速与温度梯度矢量积和平均协同角的对应变化趋势,并与普通直流道内层流下的流动与传热场协同情况进行了对比.结果表明,混沌流道改变了流体在流道内速度场的分布,流场的变化影响了温度场的分布,使得两场的协同效果得到明显的改善,从而强化传热.在整个流道内,混沌对流的Nusselt数与速度和温度梯度两矢量的点积具有相同变化关系,混沌对流强化传热的根本机理是改善了两场的协同关系.

Analysis of Field Synergy on Heat Transfer Enhancement in Chaotic Advection

Based on the numerical results of fluid flow and heat transfer in a chaotic advection channel by adopting periodic model,heat transfer enhancement in chaotic advection is analysed by using the field synergy principle.The synergy between velocity and temperature fields on the cross section in the duct was analyzed,and the relationship in the chaotic duct between the Nusselt number and the average vector product of velocity and temperature gradient,and average synergy angle in different Reynolds numbers were ...