Flow behaviour of dielectric liquids in an electric field.
J FLUID MECH
103 - 111.
Available under License : See the attached licence file.
A family of 10 silicone oils with electrical conductivity similar to 10(-13) S m(-1) (a regime hitherto systematically unexplored) and viscosities ranging from 1 to 2000mPas have been Subjected to an electrical field of up to 1.5kV mm(-1) during flow from a needle. The flow behaviour of these liquids is investigated experimentally in the flow rate regime 10(-8)-10(-12) m(3) s(-1) and we analyse the results using the Ohnesorge number. Due to the low electrical conductivity and high electrical relaxation time of the silicone oils, only unsteady transient jets were found. The onset of this type of jetting has been defined using current measurements and, in contrast to conducting liquids, the non-dimensional jet diameter increases with increase in Ohnesorge number. The time elapsed between the start and finish of jetting increases with increasing Ohnesorge number.
|Title:||Flow behaviour of dielectric liquids in an electric field|
|Open access status:||An open access version is available from UCL Discovery|
|Additional information:||© 2006 Cambridge University Press|
|Keywords:||HIGHLY VISCOUS-LIQUIDS, ELECTROSTATIC ATOMIZATION, SCALING LAWS, ELECTROSPRAY, DROPLETS, JETS|
|UCL classification:||UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Engineering Science
Archive Staff Only