MRI measurement of dynamics of the liquid and a dissolved gas during acoustic cavitation
Keywords:Acoustics, Dissolution, Electroacoustic transducers, Internet protocols, Liquids, Magnetic resonance imaging, Acoustic cavitations, Acoustic pressures, Average residence time, Cavitating bubbles, Dissolved gas, Filtered water, Gas molecules, High-frequency noise, ON dynamics, Preparation procedures, Relaxation parameter, Site exchange, Tap water
AbstractA study was conducted to perform magnetic resonance imaging (MRI) measurement of dynamics of the liquid and dissolved gas during acoustic cavitation. The study focused on obtaining information on dynamics of molecules that constituted the bubbles and the surrounding liquid. The information was acquired directly using the MRI techniques of measuring the displacement and the relaxation parameters of water along with an NMR-sensitive highly soluble gas as a function of the acoustic pressure and the water preparation procedures. The obtained data were examined using a two-site exchange model to extract estimates of the average residence time of gas molecules inside the cavitating bubbles. The cavitation onset was detected at 0.6 Atm in the tap water and at 0.7 Atm in the filtered water by the appearance of the high frequency noise detected by the hydrophone.
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