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Diagnostics of electric discharges in liquids

By Michal Vašíček


The main scope of this thesis is to measure electrical characteristics of a DC discharge in an electrolyte solution in order to evaluate individual discharge parameters (voltage, current, emitted light and sound). As a result of these parameters, a comparison between a diaphragm and capillary configuration has been realized using static and dynamic characteristics. Next part of this thesis is finding mutual differences and to set an approximate transition of individual configurations. For the study of the pin-hole discharge a polycarbonate reactor with total volume of 110 ml was used. It was divided by a changeable polyacetal insulating wall. The Shapal ceramic discs (thickness of 0.3–1.5 mm and diameter of the central pin-hole of 0.3 mm) were mounted in the centre of the insulating wall. This wall divided the reactor into two approximately equal spaces with one stainless steel electrode in each part. A DC high voltage source providing constant power supply up to 500 W was applied on the electrodes. The water solution of NaCl with initial conductivity of 570 S/cm was used as electrolyte. Time resolved electrical characteristics were recorded by a four channel oscilloscope Tektronix TDS 2024B. Measured parameters were as follows: voltage (by a HV probe Tektronix P6015A), current at ballast resistor of 5.13 , sound detected by a piezzo-microphone mounted under the reactor, and light emitted by the discharge was detected by an optical fiber in vicinity of the orifice. Measuring and processing of time resolved electrical characteristics present an accurate description of behavior of the diaphragm and capillary configuration. Voltage differences during the phase of bubble formation as well as around the breakdown point were discussed. This thesis contains a description of bubble cavitation and sets transition ratio between the diaphragm and capillary configuration approximately to l/d= 3 (where l is thickness of the wall and d is diameter of the pin-hole)

Topics: elektrická charakteristiky; Stejnosměrný elektrický výboj; electrolysis; discharge in electrolyte; discharge breakdown; generace bublin; kavitace.; zápalné napětí; výboj v elektrolytu; electrical characteristics; bubble formation; diaphragm and capillary configuration; breakdown voltage; cavitation.; zapálení výboje; DC discharge; kapilární a diafragmová konfigurace; elektrolýza
Publisher: Vysoké učení technické v Brně. Fakulta chemická
Year: 2012
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