Modeling And Parameter Optimization Of Solution Motion In Micro-triangle Zone Based On GA

High-speed centrifugal spinning has excellent potential as a promising approach for nanofiber manufacturing due to its various raw materials,low environmental requirements,and high preparation efficiency.During the centrifugal spinning process,spinning solution fill in the nozzle and the spinning container,then expand and throw out from the nozzle outlet to form a micro-triangular area on the action of gravity,centrifugal force,Coriolis force,viscous force,surface tension and air resistance.Therefore,the researches on the investigation and evaluation of the micro-triangular area interior flow field and continuous initial jet trajectory remain significant challenges.In this paper,the formation mechanism of the micro-triangular area has been theoretically modeled,numerically simulated and experimentally verified to provides a basis for the high-quality nanofibers preparation.The main research contents are as follows:1.Theoretical analysis is proposed to studied the forming process of micro-triangular zone in the high-speed centrifugal force field,flow field,and gravity field.The qualitative relationship between the critical speed of initial jet formation,the equipment process parameters and solution characteristics is explored to obtain the combination of spinning solution parameters and equipment parameters for high-quality nanofibers fabrication,and provide theoretical support for the structural optimization of high-speed centrifugal spinning equipment.2.The optimization model of the centrifugal spinning process parameters is established for the purpose of realizing the uniformity of the flow field distribution in the micro-triangular area and improving the jet stability.Based on the genetic algorithm,the structural parameters of the centrifugal spinning nozzle,the motor speed and the rheological parameters of the solution are optimized to prepare high-quality nanofibers or even specified shapes.3.Fluid simulation module is used to obtain the flow field and pressure distribution clouds inside the micro-triangular area,and to investigate the effects of different rotational speeds,nozzle diameters,and solution viscosity on the micro-triangular area formation and initial jet stretching stability.4.The formation process from the critical conical micro-triangular area to the initial jet flow is characterized by high-speed camera,and the nanofibers morphology of different process parameters are compared through electron microscope experiments to verify the correctness of the theoretical model and explore the effects of the parameters of solution,equipment and environment on the diameter of nanofibers during centrifugal spinning.Finally,the research work of "Centrifugal Spinning Parameter Optimization Based on Genetic Algorithms and Micro-Triangle Flow Field" is summarized,the shortcomings and deficiencies in theory and experiment are analyzed,and the follow-up work plan and research goals are proposed.