Analysis And Numerical Simulation Of Enhanced Mixing Characteristics Of Two-phase Flow In Special-shaped Microchannels

With the continuous development of engineering technology,in order to meet the needs of the market,more and more emerging fields have emerged,and more and more products begin to focus on the miniaturization and integration of devices.In the industrial field,the fluid system always has a large volume and poor flexibility because of its physical properties.Driven by the general environment,micro fluid research has become one of the hottest research directions at home and abroad.As the basis of microfluidic research,compared with the conventional fluidic mixing,the mixing of microfluidic fluids can greatly enhance the integration and flexibility of the mixing system,and also expand the application fields to biological analysis,chemical reactions,medical research,etc.What's more,the quality of the micromixing is associated with the performance of the channel of the micro-mixer.Therefore,it is important to analyze the rule of Intensive mixing and design the structural of microchannels.Based on the analysis and summary of relevant theories,this paper studied the micro-mixer suitable for two-phase flow and design the zigzag microchannels and cross-shaped microchannels,which are the upgraded version of classic passive mixer.According to the two norms of mixing effect and pressure loss,the author conducts the numerical simulations on straight microchannels,zigzag microchannels and cross-shaped microchannel,and determines that the zigzag is the best structure of all.In the aspect of the lead-in zone angle,the aspect ratio of the mixing zone,the opening and closing angle and the corner radius,the author optimizes the zigzag microchannel and determines the influence of the four structural factors on the mixing performance.The author uses the improved model to further study how the operating parameters,including the fluid viscosity and flow speed,influent the mixing effect.In order to be better applied in manufacturing,the article establishes a micromixer model based on the improved model and confirms its superiority through analyzing the pressure distribution,velocity distribution,fluid force and mixing characteristics.