B. Eng. (Chemical Engineering), National University of Singapore, Singapore, 2008.
Physical Modelling and Simulation of Taylor Cone-Jet Formation in Electrohydrodynamic Atomization
Electrohydrodynamic atomization in the cone-jet mode has been studied to model fabrication process of co-axial double-wall fibers and particles for drug and gene delivery applications. In this process, a liquid contained polymer solution is supplied to a coaxial-nozzle at a low rate. A droplet is formed at this nozzle. When a strong electric field is applied over this droplet, then the electric field induces free charge in the liquid surface. As a result, electric stresses occur in this surface. These stresses transform the droplet shape into a conical shape. At the cone apex a liquid jet with a high charge density occurs. In certain circumstances, this jet will break up into highly charged main droplets with a narrow size distribution, and a number of smaller secondary and satellite droplets. After evaporation of the liquid, the droplets will turn into double-wall microsphere particles.
Q. Xu, H. Qin, Z. Yin, J. Hua, D. W. Pack, C.H. Wang, “Coaxial electrohydrodynamic atomization process for production of polymeric composite microspheres”, Chem. Eng. Sci. 104, 330-346 (2013).