Měření účinku kavitační bubliny pomocí PVDF senzoru
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Date
2022-02-01
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Abstract
Diplomová práce se zaměřuje na měření účinku kolabujících kavitačních bublin v blízkosti pevných stěn. Pro měření v rámci experimentu byly použity PVDF senzory vyrobené fotolitografickou metodou. PVDF senzory byly zkalibrovány metodou pádu kuličky. Na základě získané kalibrační závislosti bylo možné ze zaznamenaného signálu elektrického napětí určit sílu působící na pevnou stěnu vlivem kolapsu bubliny. Výsledkem měření byl vztah velikosti síly od prvního a druhého kolapsu bubliny v závislosti na velikosti bubliny a její vzdálenosti od pevné stěny. V rámci měření se potvrdilo, že PVDF senzory vyrobené fotolitografickou metodou umožňují měření účinků kavitačních bublin. Výsledné hodnoty působících sil od kolapsů bublin a také rozdělení energií mezi prvním a druhým kolapsem odpovídá měřením provedeným v dalších výzkumech.
This diploma thesis is focused on the measuring of the effect of collapsing cavitation bubbles in the surroundings of solid walls. PVDF sensors - made by photolithographic method - were used for experimental measurements. PVDF sensors were calibrated by the ball-drop method. On the basis of the obtained calibration dependence, it was possible to determine the force acting on the solid wall due to the collapse of the bubble from the recorded voltage signal. The result of the measurement was the relationship of the magnitude of the force from the first and second collapse of the bubble, depending on the size of the bubble and its distance from the solid wall. The measurements confirmed that PVDF sensors produced by the photolithographic method allow the measurement of the effects of cavitation bubbles. Resulting values of the acting forces of the collapse of the bubbles as well as the distribution of energies between the first and the second collapse correspond to the measurements made in previous research.
This diploma thesis is focused on the measuring of the effect of collapsing cavitation bubbles in the surroundings of solid walls. PVDF sensors - made by photolithographic method - were used for experimental measurements. PVDF sensors were calibrated by the ball-drop method. On the basis of the obtained calibration dependence, it was possible to determine the force acting on the solid wall due to the collapse of the bubble from the recorded voltage signal. The result of the measurement was the relationship of the magnitude of the force from the first and second collapse of the bubble, depending on the size of the bubble and its distance from the solid wall. The measurements confirmed that PVDF sensors produced by the photolithographic method allow the measurement of the effects of cavitation bubbles. Resulting values of the acting forces of the collapse of the bubbles as well as the distribution of energies between the first and the second collapse correspond to the measurements made in previous research.
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Subject(s)
kavitace, dynamika bubliny, kolaps, PVDF senzor, fotolitografie, cavitation, bubble dynamics, collapse, PVDF sensor, photolithography