弹性管束湿模态频率变化对传热特性影响分析

Effects of elastic tube bundle’s wet modal frequency variation on its heat transfer characteristics

为了研究弹性管束湿模态频率变化对其传热特性的影响,以弹性管束为研究对象,进行实际运行工况下的建模及湿模态数值模拟分析。通过附加质量系数表征弹性管束湿模态频率的变化情况,在考虑流体介质的流速及黏度的影响下,计算得到湿模态频率相应的附加质量系数,并通过湿模态频率的改变对弹性元件换热性能进行分析。分析认为:流体的黏度越高,对弹性换热管束施加的附加质量系数就越大,使弹性元件的湿模态频率降低的越多,处于流场中的弹性元件湿模态频率随来流速度的增加而上升;弹性元件受外部流场流体黏度与速度的影响,湿模态频率越高,受到流体的附加质量系数越小,表面换热效果越好。

In order to study effects of an elastic tube bundle’s wet modal frequency change on its heat transfer characteristics,here,the elastic tube bundle was taken as the study object to do modeling under actual operating conditions and numerical simulation of wet modal analysis.The added mass coefficient was used to characterize variation of the elastic tube bundle’s wet modal frequency,considering effects of fluid’s flow velocity and viscosity,the added mass coefficient corresponding to wet modal frequency was calculated.Elastic element’s heat transfer performance was analyzed with change of wet modal frequency.The results showed that the higher the fluid viscosity,the larger the added mass coefficient for the elastic tube bundle,the more the drop of elastic element’s wet modal frequency;with increase in incoming flow’s velocity,wet modal frequency of elastic element in a flow field increases;external flow field’s fluid velocity and viscosity affect elastic elements,the higher the wet modal frequency,the smaller the added mass coefficient,and the better the surface heat transfer effect.