Record Details

Breakup of a conducting drop in a uniform electric field

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Breakup of a conducting drop in a uniform electric field
 
Creator KARYAPPA, RB
DESHMUKH, SD
THAOKAR, RM
 
Subject breakup/coalescence
drops
electrohydrodynamic effects
LEAKY DIELECTRIC DROP
ELECTROHYDRODYNAMIC DEFORMATION
MAGNETIC-FIELDS
CHARGED DROPS
AQUEOUS DROPS
VISCOUS DROP
WATER DROPS
LIQUID
STABILITY
FLUID
 
Description A conducting drop suspended in a viscous dielectric and subjected to a uniform DC electric field deforms to a steady-state shape when the electric stress and the viscous stress balance. Beyond a critical electric capillary number Ca, which is the ratio of the electric to the capillary stress, a drop undergoes breakup. Although the steady-state deformation is independent of the viscosity ratio lambda of the drop and the medium phase, the breakup itself is dependent upon lambda and Ca. We perform a detailed experimental and numerical analysis of the axisymmetric shape prior to breakup (ASPB), which explains that there are three different kinds of ASPB modes: the formation of lobes, pointed ends and non-pointed ends. The axisymmetric shapes undergo transformation into the non-axisymmetric shape at breakup (NASB)before disintegrating. It is found that the lobes, pointed ends and non-pointed ends observed in ASPB give way to NASB modes of charged lobes disintegration, regular jets (which can undergo a whipping instability) and open jets, respectively. A detailed experimental and numerical analysis of the ASPB modes is conducted that explains the origin of the experimentally observed NASB modes. Several interesting features are reported for each of the three axisymmetric and non-axisymmetric modes when a drop undergoes breakup.
 
Publisher CAMBRIDGE UNIV PRESS
 
Date 2014-12-28T12:09:34Z
2014-12-28T12:09:34Z
2014
 
Type Article
 
Identifier JOURNAL OF FLUID MECHANICS, 754550-589
0022-1120
1469-7645
http://dx.doi.org/10.1017/jfm.2014.402
http://dspace.library.iitb.ac.in/jspui/handle/100/16450
 
Language English