Design and development of a high pressure facility for the study of the effects of dielectrophoretic transients on liquid stability

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Abstract
A high pressure facility ( approximately 100 bar (10 MPa)) for the study of pressure dependence of dielectrophoretic transients effects on stability of liquids has been designed and developed. The device used is based on the principles of a bubble chamber. The dielectrophoretic effects are generated by introduction of dielectric, conductivity and electric field gradients in the liquid under pressure which is measured with the help of a capacitance manometer both in the static and dynamic modes. In order to make the body force calculations more realistic, the electric field is applied directly on the surface of a glass heater coated with a thin ( approximately 10-4 mm), transparent and conducting SnO2 film. The pressure, the instant of the application of electric field, the transients effects and times are recorded simultaneously on a X-Y/t recorder. Typical sets of observations for three liquids, namely in-pentane (95%), n-hexane (99%) and n-heptane (95%), have been shown. Whereas the effect of dielectrophoretic transients, measured in terms of the change in the heater surface temperature, is to destabilise the liquid, the external pressure tends to stabilise it in contact with the heater surface.

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