Simulation of droplet generation through electrostatic forces

Abstract

This paper represents the multiphysics simulation of droplet generation of ink containing conductive nano-particles through electrostatic forces on substrate. The main focus is to investigate the phenomena by generating the drops through a nozzle with the help of electrostatic forces. The electrostatic based deposition system has vast application in printed electronics and biotechnology. In electrostatic deposition mechanism for droplet generation, a strong electric potential is applied at the tip of the nozzle; due this electric potential, the liquid containing the nano-particles experience strong electrostatic static forces at the interface with the air (at the tip of the nozzle). When these electrostatic forces exceed the internal (viscous forces) and external forces (surface tension), a deformation takes place which results in the flow of the liquid in the form of droplets. The size of the droplet is dependent on different parameters like applied voltage, properties of the ink, dimension of the nozzle. To have better understanding of this, a numerical simulation was performed based on multi-physics approach. Multiple simulations were performed by changing the position of electrode in nozzle and varying the applied voltage. Droplet size with respect to applied voltage was evaluated; electric field with respect to applied voltage and time for the droplet generation was also evaluated through these simulations. This study will help in better understanding the parameters of droplet generation phenomena and optimal design of the nozzle for the electrostatic inkjet system.

Development of the Improving Process for the 3D Printed Structure

“…As June of 2016, 3D printing technology is applied for following many fields. Artificial bone, artificial joint, and artificial organ in the bio medical technology field and solar cell in green technology field were fabricated by the 3D inkjet method910111213. Complex metal products were fabricated by the Selective Laser Sintering (SLS)141516.…”

Generation and Evaporation of Microsprays

“…For instance, some mechanically pneumatic pumps connecting to metal nozzles are able to eject high-throughput sprays robustly but noisily; therefore, they are most often exploited for evaporative cooling in large buildings and facilities [27][28][29]. However, at smaller scales, many new types of micro actuators such as piezoelectric [3][4]30] and electrostatic [14,31] ones are used to take advantage of precise electrical control over spray. Compared to the former (pneumatic), these microfluidic actuators may be further explored for versatile circumstances of daily life using novel and versatile materials.…”

Different approaches to PVP/graphene composite film fabrication using electrohydrodynamic atomization technique

“…At each flow rate, the strength of the electric field was increased by gradually increasing the potential difference between the anode nozzle and the grounded stage [17][18][19]. At each flow rate step, applying different magnitudes of voltage gave different modes of atomization and hence various modes were observed such as the dripping to the multi-jet [20][21][22].…”