AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
Strictly Monodispersed Droplets Generated by External Electro-hydrodynamic Perturbations on Liquid Jets
HONGXU DUAN, Weiwei Yang, Johan Rodriguez, Jing Gu, Weiwei Deng, University of Central Florida
Abstract Number: 683 Working Group: Aerosol Physics
Abstract The ordered break-up of liquid jets is an effective way to produce highly monodispersed droplets. Here we report a new approach to apply periodic electro-hydrodynamic (EHD) perturbations on liquid jets of modest Webber numbers. Two perturbation modes are demonstrated: radial mode and axial mode. When the perturbation is near the 50% and 100% of the Rayleigh frequency, liquid jets experience highly ordered break-up which results in strictly monodispersed droplets with typical standard deviation of 0.01. We found that the electric stress gradient, instead of the magnitude of electric stress, near the jet surface must be sufficient to introduce the short wavelength perturbation. We extended the Rayleigh jet model and back calculated the magnitude of initial perturbation, which could be as small as a few nanometers. We termed the periodic perturbation source as “EHD chopper”. The design and implementation of EHD chopper is scalable for generating highly monodispersed droplets from multiple jets.