Rezumat
CZU 532.5:537 + 536.24:537
DOI https://doi.org/10.52577/eom.2022.58.2.31
The one-stage electrohydrodynamic (EHD) pumps with electrodes “a diaphragm – a plate with a hole” and “a wire – a plate with a hole” are studied. It is established that with the help of flow-limiting diaphragms, the pump characteristics can be significantly improved. It is indicated that in the main multi-stage EHD pumps, it is preferable to use lattice-type electrodes made of bare and perforated insulated wires. Optimal geometrical parameters of electrodes, flow-limiting diaphragms, dielectric coatings, and interelectrode distances are determined. The influence of the electrophysical properties of the working medium and galvanically isolated high voltage sources on the performance of a multistage pump is considered. Possible ways to reduce the mutual influence of steps on its output parameters are shown. Formulas have been obtained that reliably fully reflect the physical nature of the results of studies of the characteristics of EHD pumps. It was found out that organosilicon liquid has the best characteristics and considering the stability of its properties under the influence of an electric field, micro-discharges, and temperature, it is recommended to use it as a coolant in EHD heat exchangers. The reasons for the deterioration of the pump characteristics during prolonged operation are identified, and ways to reduce the influence of these factors on the output parameters are noted.
Keywords: electrohydrodynamic pump, multistage, dielectric fluid, pressure, flow, dielectric coating, perforation, efficiency, rod (cylindrical) electrodes, diaphragm, plate with hole, gratings, galvanically isolated sources .