摘要
首先概括了静态混合的技术特色;其次,重点综述了近年来旋流静态混合器内脉动压力与速度波动的统计特征、多尺度分形和混沌混合特性等方面的研究进展;实验研究发现Kenics静态混合器各点压力最大波动幅值与进口流量呈二次函数关系,脉动功率谱随着频率的增加呈幂函数关系衰减;轴截面内壁面自由涡和主体区强制涡相互耦合诱导混沌流的产生,同时提高速度与温度梯度的场协同程度。最后,总结了静态混合器内螺旋元件的切割分流、改变流向和径向混合等功能在强化CO2水合物形成过程中的作用。指出将计算流体力学、映射法等方法同LIF、PIV、PFS有机结合可有效地分析静态混合器内多相流动混合机理。
This paper first summarized the features of static mixing technology. The recent progress of researches on statistical characteristics of pressure fluctuation signals （PFS） and velocity field, multi-fractal, and chaotic mixing, were mainly described. The experiment results showed that the relationship between the maximums of pressure fluctuations and the inlet flow rates can be described by a quadric equation and the power amplitude follows power-law attenuation as the frequency increased. The chaotic advection were generated and field synergy between velocity and temperature gradient can be effectively improved by the coupled secondary flow derived from the free vortex in the internal wall and the forced vortex in the bulk zones. In the end, the intensification impacts of flow division, flow reversal and radial mixing of the twisted-leaves in the static mixer on formation of CO2 hydrate were summarized as well. Finally, the mixing mechanism of the multiphase fluid in the static mixer could be further interpreted based on the integration of CFD, mapping approach and LIF, PIV, PFS tools.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2013年第2期255-262,282,共9页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(21106086)
辽宁省高等学校优秀人才计划(LJQ2012035)项目
关键词
静态混合器
压力波动信号
瞬时速度
混沌流
强化混合
static mixers
pressure fluctuation signals
instantaneous velocity
chaotic flow
intensified mixing
