Accession Number : ADA416740


Title :   Force on an Asymmetric Capacitor


Descriptive Note : Final rept. Aug-Dec 2002


Corporate Author : ARMY RESEARCH LAB ADELPHI MD


Personal Author(s) : Bahder, Thomas B ; Fazi, Christian


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a416740.pdf


Report Date : Jun 2003


Pagination or Media Count : 37


Abstract : When a high voltage (approx. 30 kV) is applied to a capacitor whose electrodes have different physical dimensions, the capacitor experiences a net force toward the smaller electrode (Biefeld-Brown effect). We have verified this effect by building four capacitors of different shapes. The effect may have applications to vehicle propulsion and dielectric pumps. We review the history of this effect briefly through the history of patents by Thomas Townsend Brown. At present, the physical basis for the Biefeld-Brown effect is not understood. The order of magnitude of the net force on the asymmetric capacitor is estimated assuming two different mechanisms of charge conduction between its electrodes: ballistic ionic wind and ionic drift. The calculations indicate that ionic wind is at least 3 orders of magnitude too small to explain the magnitude of the observed force on the capacitor. The ionic drift transport assumption leads to the correct order of magnitude for the force, however, it is difficult to see how ionic drift enters into the theory. Finally, we present a detailed thermodynamic treatment of the net force on an asymmetric capacitor. In the future, to understand this effect. a detailed theoretical model must be constructed that takes into account plasma effects: ionization of gas (or air) in the high electric field region. charge transport, and resulting dynamic forces on the electrodes. The next series of experiments should determine whether the effect occurs in vacuum, and a careful study should be carried out to determine the dependence of the observed force on gas pressure, gas species and applied voltage.


Descriptors :   *CHARGE TRANSFER , *ELECTRIC PROPULSION , *CAPACITORS , THERMODYNAMICS , DIELECTRICS , ELECTRIC FIELDS , ELECTRICAL CONDUCTIVITY , HEAT TREATMENT , ASYMMETRY , ELECTRODES , BALLISTICS , HIGH VOLTAGE , CYCLIC LOADS , IONIC CURRENT , ELECTRIC CHARGE


Subject Categories : Electric and Ion Propulsion
      Electricity and Magnetism
      Electrical and Electronic Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE