Abstract
To improve the jet performance of a bi-piezoelectric jet dispenser, mathematical and simulation models were established according to the operating principle. In order to improve the accuracy and reliability of the simulation calculation, a viscosity model of the fluid was fitted to a fifth-order function with shear rate based on rheological test data, and the needle displacement model was fitted to a nine-order function with time based on real-time displacement test data. The results show that jet performance is related to the diameter of the nozzle outlet and the cone angle of the nozzle, and the impacts of the flow channel structure were confirmed. The approach of numerical simulation is confirmed by the testing results of droplet volume. It will provide a reliable simulation platform for mechanical collision-based jet dispensing and a theoretical basis for micro jet valve design and improvement.
Highlights
The mechanical collision-based jetting dispenser is a significant device in the electronic information manufacturing industry, as it features high performance and high efficiency [1,2,3,4,5,6].In the 1970s and 1980s, many experts studied ink-jet technology [7,8,9,10], but this technology is only applicable for low viscosity (
Principle and Models of Mechanical Collision-Based Jet Dispensing beginning, the needle moves upward, pressure Ps is smaller than PA, and fluid flows into the nozzle
To study the impact of flow channel on jet performance, the simulation and experiment were theThe impact of fraction flow channel jet performance, simulation and experiment volume contour on figures during the workthe processes are presented in Figure were carried out
Summary
The mechanical collision-based jetting dispenser is a significant device in the electronic information manufacturing industry, as it features high performance and high efficiency [1,2,3,4,5,6]. Du studied the jetting dispenser, driven by mechanical collision, with simulations and experiments [27]. Driven by mechanical with simulations and jet device [28] In their studies, the displacement of the needle was simplified as a trapezoidal experiments [27]. Wu studied the droplet-forming process and designed an experimental jet device [28] In their studies, the displacement of the needle was simplified as a trapezoidal wave, and the adhesives were assumed to be a power law fluid. The displacement needle and the fluid viscosity are tested, the results are used a finite element analysis to of wave, and the adhesives were assumed to beand a power law fluid.
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