Study On The Rotating Mechanism Of A Energized Liquid Film In External Electric Field

With the development of science and technology,macroscopic films have more and more applications in engineering,physics and so on.Under the cross direct current electric field and the cross alternating current electric field,the suspended liquid film exhibits the phenomenon of rotation and vibration separately.In this paper,the kinetic characteristics of a ohmic liquid film(J)under external electric field(E)are verified:(1)The rotation direction of the suspended liquid film follows the vector product direction:ExJ;(2)When the liquid film starts to rotate,the threshold value that the product of the external electric field and the power supply voltage is a constant;(3)the points near the center of the vortex are rotating faster than the ones away from the center.In addition,we changed the shape of the suspended liquid film which also meet the above relationship.After changing the position of the electrode on the square frame,the liquid film can still show the rotation phenomenon.Two vortices with opposite rotating directions on a suspended liquid film are observed when the vertical external electric field E is applied perpendicular to the liquid film passing electrical current J,but the rotation direction of the two vortices is random.the radius of a vertex increases and the other decreases as the external electric field deviates from the vertical direction to the horizontal direction,finally the small vertex dispears when the external electric field falls in is about ?/2 with the plane of the film.when the external electric field is changed to the horizontal direction,the rotation direction of the residual vortex follows the vector product direction:ExJ.Under the vertical external electric field,when the suspended liquid film on the frame is replaced by a bubble,there are two vortices with the same rotation direction in the two sides of the bubble.With the change of the direction of the external electric field,the vortex on the liquid film of the suspended bubble is gradually changed into one,and the direction of rotation is still follow the direction of the vector product:Ex J.When the horizontal external electric field and the voltage is applied to the suspended bubble on the frame,the rotation direction of the vortex is still follow the direction of the vector product:ExJ.The electrode is up and down direction which the bubble is suspended between the electrodes,the two sides of the bubble have two vortices rotating in the same direction.It is inferred that the interaction between current carrying charges and the polarized water molecules produces the rotating torque of liquid film.A simple theoretical analysis explains the points near the center of the vortex are rotating faster than the ones away from the center.Through our experimental phenomena and theoretical analysis,the paper provides a new reference for the theoretical analysis of a suspended liquid film and provides a new direction for the application of the liquid film in the microfluidic system.When the liquid film with is replaced with a suspended bubble,two vertices with same rotating directions on two opposite sides of the bubble appear and the rotating direction is still pointing to the direction of ExJ.It is inferred that the interaction between current carrying charges and the polarized water molecules produces the rotating torque of liquid film.There is theoretical analysis that explains the points near the center of the vortex are rotating faster than the ones away from the center.Through the experimental phenomena and theoretical analysis,the rotating mechanism of a suspended liquid film is revealed which provides a direction for the application of a liquid film in the microfluidic system.