螺旋流混合器内部流动及换热分析

Analysis of flow and heat transfer in spiral flow mixer

构建了一种无运动部件的螺旋流混合器三维模型,运用计算流体力学理论,采用湍流、非定常和传热模型,模拟了冷、热水在混合器中螺旋混合的过程,并通过对混合器内流线和温度分布等的分析,探讨了混合器内部流动和能量交换的规律,以及进口流速和混合器容积的变化对其出口温度的影响。计算结果表明:螺旋流混合器可以得到了比较好的混合效果;在一定的阻力下,进口速度越大越易形成旋流,混合效果越好;螺旋流混合器的容积变化对混合效果影响明显,随着容积的增大,调整时间显著增加。

In this paper,a 3D model was constructed for a type of spiral flow mixer with immovable parts,using turbulence model,unsteady model and heat transfer model to simulate the internal state of the mixer on computational fluid dynamics theory.Through the analysis of the path line,the change rule of temperature and so on,the paper discussed the characteristics of flow and heat transfer in the mixer and the change rule of export temperatures with inlet velocity and mixer's volume.The calculation results showed that spiral flow mixer can get better mixed effect;the relation between mixed effect and inlet velocity was direct ratio;mixed effects obviously change with the change of mixer's volume,and along with the increase of volume,the regulatory time significantly increased.