混沌流翅片防结垢研究

针对板翅式换热器存在的结垢问题,采用新型混沌翅片来改变流道内的流动状态,利用数值计算的方法获得混沌翅片形成流道的RTD(Residence Time Distribution)曲线,直观地测定了流道死区、活塞流及全混流各部分所占的体积分数,得出了Pe数并分析了其对结垢的影响。结果表明,随着周期的增加,混沌翅片流道内的死区体积减少,活塞流体积增加,Pe数也增大,有利于流道抗结垢。通过对比,证实了混沌翅片在板翅式换热器防结垢中的工程实用价值。

Study of anti-scaling of chaotic flow fin

In order to solve the fouling problem existing in plate-fin heat exchanger,this essay adopts new-style chaotic plate fins,which can change the flowing state in the flowing channel.The RTD curves in chaotic plate fin channels are obtained by numerical simulation.This calculational treatment provides a method that measures death volume fraction,plug flow volume fraction,well-mixed volume fraction and Peclet number.And the numerical simulation results demonstrate that death volume generally reduces,the plug flow volume and Peclet number increases along with the number of periods increasing.It is good for anti-scaling property of the flowing channels.Finally,it is also approved that chaotic plate fins have extensively practical value in the plate-fin heat exchangers for anti-scaling by comparison.