NDLI: Forces and movement of water droplets in oil caused by applied electric field

Content Provider	IEEE Xplore Digital Library
Author	Pedersen, A. Ildstad, E. Nysveen, A.
Copyright Year	2004
Description	Author affiliation: Dept. of Electr. Power Eng., NTNU, Trondheim, Norway (Pedersen, A.; Ildstad, E.; Nysveen, A.)
Abstract	The effect of applying an electric field to an emulsion of water and oil is to induce attractive forces and enhance the coalescence of adjacent water droplets. In the oil industry, it is common to utilize this process, called electrocoalescense, to enhance oil-water separation by enlarging the water droplets. The work presented here describes the forces influencing the kinematics of droplets, with radius around 0.5 mm, exposed to an electric field when falling in stagnant oil. Different mathematical simulation models are tested and the results are compared with experiments made with two falling droplets exposed to an electric field perpendicular to the direction of their motion. The trajectory of the water droplets has been optically determined using a high speed digital camera. The results show that when the droplets are more than one droplet radius apart, the electric forces can be accurately determined using the dipole approximation. At smaller distances, numerical field calculation techniques and the effect of film thinning need to be considered.
Starting Page	683
Ending Page	687
File Size	275818
Page Count	5
File Format	PDF
ISBN	0780385845
DOI	10.1109/CEIDP.2004.1364342
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-10-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gravity Optical films Power engineering Petroleum industry Kinematics Mathematical model Testing High speed optical techniques Digital cameras Electronic switching systems
Content Type	Text
Resource Type	Article

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