Simulation and experimental study on temperature field of fluid jet-dispenser
Fluid jet-dispensing technology has been widely used in micro-electronic encapsulation industry. The fluid viscosity varies as temperature changes, while it affects the process remarkably. Besides basic method on temperature field solution, some thermal behaviors, including heat conduction and heat exchange, boundary conditions and some physical parameters are overall analyzed in this paper. Based on the simulation software platform ANSYS, a two-dimensional transient temperature field model of jet-dispenser was built, and simulation programs on temperature field for two sorts of fluid with obviously different thermal conductivity were performed. Then heating experiments were finished to validate the feasibility of FEA, and results show that temperature distribution is homogeneous along fluid area and it meets the conditions of jetting.
The influence discipline of temperature of high viscosity fluid jetting
Viscosity which varies with the temperature remarkably was one of an important factor for fluid jetting. In this paper finite element models of fluid jet-dispenser for thermal analysis and fluid-structure interaction analysis were built through ANSYS. The decided heat flux was loaded to the finite element model for thermal analysis to obtain the temperature field of the fluid field. So the average viscosity of the heated fluid can be worked out. And then the accumulative volume, average velocity and equivalent velocity of two different kinds of fluid between in heating and room temperature condition in fluid-structure interface analysis were compared. The results indicted that the heated fluid was apt to spout. And the losing heat was also worked out in jetting stage which was a reference to next work and designing the heater.
The Influence of Actuator Parameters on Fluid Jetting Dispensing
The actuator is an important component of the fluid jet-dispenser,and has an important influence on the fluid volume and velocity of the fluid jetted from the jet-dispenser.The calculation formula of cumulative fluid volume and its equivalent velocity based on fluid kinetic energy are deduced through central velocity at the nozzle outlet from the numerical simulation result,then cumulative fluid volume and equivalent velocity are computed under the condition of different actuator parameters by MATLAB program.This research supplies some foundation for the design and operation adjustment of the actuator.The results show a good changeing characteristic of the cumulative fluid volume and equivalent velocity,the stroke of the ball-needle compared with its acceleration has less influence on the jetting fluid dispensing.