| Microfluidic technology has many characteristics such as integration,high throughput,high precision,etc.,and has a wide range of applications in many fields such as food processing,drug controlled release and virus detection.With the rapid development of microfluidic technology,comprehensive performance research on microfluidic devices and precise control of microdroplet generation have become the focus of current research.The flow process of the liquid / liquid incompatible two phases in the microchannel is complicated,and there are many factors influencing the droplet generation process,which leads to a decrease in the controllability of the microdroplet generation process.In this paper,the method of combining numerical simulation and experimental research is used to study the formation rules of microdroplets and explore the formation mechanism of microdroplets,which is of great significance for improving the controllability of the microdroplet generation process.First,based on the microfluidic single-emulsion template device,the microdroplet generation schemes under liquid / liquid single-emulsion Newtonian system and liquid / liquid singleemulsion non-Newtonian system were designed to explore the dispersed phase flow rate,dispersed phase viscosity,continuous phase flow rate respectively,The influence of continuous phase viscosity,two-phase interfacial tension and other factors on droplet formation,and the influence of various factors on droplet flow state,provide guidance for precise manipulation of droplets in glass capillary device microchannels.Based on a glass capillary microfluidic device,a microfluidic experimental device was built to design an experimental scheme for droplet generation under a liquid / liquid double-emulsion Newton system.Millimeter-grade oil core microcapsules with controllable properties and uniform sizes were successfully prepared and then passed The effect of flow velocity on the formation of microcapsules was studied,and the phase diagram of microcapsule formation was obtained.The effects of internal phase flow rate and external phase flow rate on the characteristic size of microcapsules were also studied.Based on the results of numerical simulation and experimental research,the application of microfluidic controllable microdroplets in actual production was initially explored.Based on the research of the droplet formation mechanism in the hydrogel / oil system,a microfluidic control scheme for suspending microdroplets was designed,and a microdroplet suspension was successfully prepared.Based on the research of the mechanism of micro-droplet generation under the liquid / liquid single-emulsion non-Newtonian system,the microfluidic technology and 3D printing technology are combined to design a 3D droplet printing control system,build a 3D droplet printing device,and initially realize 3D Precise control of droplet printing. |
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