Dielectrophoresis of bubbles in isomotive electric fields

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Abstract
The behaviour of bubbles rising in AC isomotive electric fields of 50 Hertz frequency was investigated in several dielectric liquids. Isomotive electrodes were immersed in the sample liquids and aligned so that the motion of single bubbles of nitrogen rising in the interelectrode space was opposed by the dielectrophoretic force. The transit time of each bubble was timed over two set distances as a function of the voltage applied to the electrodes. The set distances were defined by three laser beams so that their interruption by a bubble could be detected optoelectronically and timed using a microcomputer. Analysis of the data presented indicates that the dielectrophoretic force on the bubbles is only position independent in the interior of the isomotive electric field.

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