Numerical Simulation And Experimental Research Of Droplet Deposition Process On The Twill Fabric Surface

Smart textiles are a new type of textile that combines traditional textiles with electronic technology,which are typically made up of sensors,actuators,data processing,communications,and power supplies,the flexible preparation of the conductive lines between the modules connected to the electronic system is the key to the realization of the intelligent textile function.The traditional conductive circuit preparation methods include implantable and screen printing,etc.,and the formed conductive line has low coupling with the fabric,which seriously affects the performance of the fabric itself.Therefore,how to realize the flexible integration of conductive lines and fabrics is a difficult problem to be solved in current smart textiles.Based on this,the research group proposed a method for depositing and manufacturing a conductive of the fabric surface by combining droplet ejection and chemical deposition techniques.During the deposition process of conductive lines,it is clear that the collision and spreading process of droplets on the surface of the fabric is particularly important for forming high-quality conductive lines.Therefore Based on the geometrical parameters of twill fabric,based on the fluid volume method(VOF),the finite element model of the deposition of droplets on the surface of twill fabric is established.The impact and droplet morphological changes of the droplet on the twill fabric are researched,The deposition behavior of droplets on twill fabrics is studied from the pressure field,velocity field and fluid parameters of droplet deposition morphology,to lay a foundation for subsequent printing and forming conductive lines,The specific research contents are as follows:Firstly,the finite element model of the impact and spreading of the droplets on the twill fabric is established.The geometric structure of the twill fabric is analyzed,according to the geometry and parameters of the twill weave,the finite element model of the droplet deposition is established by the fluid volume method.Secondly,the reason why the droplets collide with the spreading morphology on the twill fabric is researched.By numerically simulating the change of deposition morphology of droplets on the warp and weft of twill fabric,it is indicated that the gradient of pressure and velocity field is the main reason for the morphology of droplets.For the different positions of the impact,the spreading and permeation rates of the droplets are different,and the pressure field changes at different stages are different,so that the deposition patterns of the droplets are different when the different deposition positions are struck.Then,the influencing factors of the impact and spread of the droplets on the twill fabric are studied.By changing the radius of the droplet,the impact velocity and the fluid properties,the influence law of the impact morphological changes of the droplets on the twill fabric is revealed.Finally,the results of the numerical simulation were verified by experiments,using the pneumatic droplet ejection experimental platform designed by the research team.The results show that the experimental process of deposition of droplets on the fabric is basically consistent with the numerical simulation process,which verifies the correctness of the model.