Numerical Simulation and Experimental Study of Electromagnetic Driven Droplet Jetting
Aiming at the current microdroplet nozzle problem,a microdroplet spraying device based on electromagnetic drive is designed.A multi-physical field coupled spray simulation model is established,and the influence of the driving voltage and fluid viscosity on the microdroplet volume and spray velocity are analyzed through numerical simulation.The microdroplet spraying test is carried out using the built nozzle test platform.The results show that the droplet volume and jetting velocity increase with the increase of driving voltage amplitude,the droplet breakage time is delayed with the increase of fluid viscosity,and the droplet trailing is gradually shortened.The uniform droplets with a volume of approximately 5.7 nL can be generated on demand when the diameter of the nozzle hole is 0.12 mm,the driving voltage is 21 V and the viscosity is 0.001 mPa·s.The results of the microdroplet spray test and the simulation results match well,indicating that the proposed numerical model and method can be used to analyze the influence of the driving voltage and fluid viscosity on the droplet volume and jetting velocity by numerical simulation.It shows that the proposed numerical model and method are feasible,and verifies the feasibility of the designed electromagnetic drive diaphragm nozzle to generate stable droplets.
electromagnetic drivemulti-physical field simulationmicro spray experiment