Measurement of the impuslive force generated by colapsing bubble close to a solid boundary
Faculty of Mechanical Engineering, Technical University of Liberec, Studentskâ 2, 46117, Liberec 1, Czech Republic
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2 Department of Thermodynamics, Institute of Thermomechanics, v.v.i., Academy of Sciences of the Czech Republic, DolejSkova 5, 18200 Praha, Czech Republic
The article presents experimental results of the acoustical and optical study of cavitation bubble collapse close to a solid boundary in water. The bubble was generated by discharge of low-voltage capacitor into a couple of wires closing a simple circuit. Different distances from the solid wall and different maximum bubble radii were studied. The bubble radius was studied using time-resolved photography and by PVDF film sensor glued on the solid boundary. The illumination was provided by high-power led diode. Synchronization of the system was provided by pulse generator connected to an oscilloscope. The impact power of the bubble to the wall was estimated from the time-resolved photography of the bubble and from the PVDF film sensor signal. The PVDF film sensor calibration was performed by a pendulum test to estimate the impact force.
© Owned by the authors, published by EDP Sciences, 2012