Abstract
The electric field applied in dielectric fluids causes an imbalance in the dissociation-recombination reaction generating free space charges. The generated charges are redistributed by the applied electric field resulting in the heterocharge layers in the vicinity of the electrodes. Proper design of the electrodes generates net axial flow motion pumping the fluid. The electrohydrodynamic (EHD) conduction pump is a new device that pumps dielectric fluids utilizing heterocharge layers formed by imposition of electrostatic fields. This paper investigates the performance characteristics of EHD conduction pump in two-phase thermal control loops. The EHD twophase loop consists of an EHD conduction pump, condenser, evaporator, transport lines, and reservoir (accumulator). The tests are performed with two different loops alternating two different EHD pumps to measure the generated pressure head and the mass flowrate at various applied voltages and sink temperatures. The power consumption of EHD conduction pumps is also determined by measuring the electric current value. The de-aerated R134a and unprocessed R134a are used as the working fluid. The dependence of EHD pump performance on the fluid temperature, effects of de-aeration of working fluid, effects of electrode design, pressure loss within EHD pump, influence of the loop size (tube diameter and length) are investigated.
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