Analysis of circular dielectrophoretic effects on impact splashes

Abstract

When a liquid droplet falls unto a surface, the impact of its velocity to a static ground may cause many reactions. These reactions may include deposition, prompt splash, corona splash, receding break-up, partial rebound, and complete rebound. Depending on the properties of the liquid and surface as well as the conditions, different reaction may occur. As the higher velocity droplets tend to create splashing, the vice-versa is prominent too; an object with high velocity falling into a pool of liquid is likely to create splashing. These splashing effects create turbulent flow which disrupts the surrounding and create noise. Applications such as high impact machinery or the department of defence may be concern about the noise production, while ink jets and dispersal of solution may be concern about the splash area. One method to reduce such disruptions is by dielectrophoresis, which is the induction of dielectrophoretic forces of attraction. By inducing an inhomogeneous electric field, it may alter the required properties and conditions, thereby reducing or eliminating the possibility of a splash. In this study, the theory of supressing splash by implementing dielectrophoresis will be experimentally carried out and examine. When a droplet with high velocity impact a smooth static surface, it will create a prompt splash, with variations due to factors such as drop size, liquid viscosity, and strength of the surface tension. However, when the dielectrophoretic field is on, the splash is minimized, and the droplet is deposited (flattened) to a larger area. To conclude this study, the relationship between the reaction of impact and the force of dielectrophoresis will be examined to ensure that the research results are consistent. If the results gather a positive effect, dielectrophoresis can be a mean of decrease the occurrence of splashes.