Bubble Detachment in Variable Gravity Under the Influence of Electric FieldsThe objective of the research is to investigate the behavior of individual air bubbles injected through an orifice into an electrically insulating liquid under the influence of a static electric field. Situations were considered with both uniform and nonuniform electric fields. Bubble formation and detachment were visualized in terrestrial gravity as well as for several levels of reduced gravity (lunar, martian and microgravity) using a high-speed video camera. Bubble volume, dimensions and contact angles at detachment were measured. In addition to the experimental studies, a simple model, predicting bubble characteristics at detachment in an initially uniform electric field was developed. The model, based on thermodynamic considerations, accounts for the level of gravity as well as the magnitude of the uniform electric field. The results of the study indicate that the level of gravity and the electric field magnitude significantly affect bubble behavior as well as shape, volume and dimensions.
Document ID
20110001056
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Herman, Cila (Johns Hopkins Univ. Baltimore, MD, United States)
Chang, Shinan (Johns Hopkins Univ. Baltimore, MD, United States)
Iacona, Estelle (Johns Hopkins Univ. Baltimore, MD, United States)
Date Acquired
August 25, 2013
Publication Date
November 17, 2002
Subject Category
Fluid Mechanics And Thermodynamics
Meeting Information
Meeting: 2002 ASME International Mechanical Engineering Congress and Exposition