Publication Date:
2006-07-01
Description:
A family of 10 silicone oils with electrical conductivity ∼ 10-13S m-1 (a regime hitherto systematically unexplored) and viscosities ranging from 1 to 2000 m Pa s have been subjected to an electrical field of up to 1.5 kV 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-3s-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. © 2006 Cambridge University Press.
Print ISSN:
0022-1120
Electronic ISSN:
1469-7645
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
