Spatially resolved NMR relaxation of gas in cavitating liquid

Igor Mastikhin, Benedict Newling

Abstract


The nuclear magnetic resonance (NMR) relaxation parameters of Freon-22 gas in cavitating liquid, was investigated using magnetic resonance imaging (MRI). The behavior of gas in multibubble cavitation was analyzed using 2.35 T MRI scanner with 20 kHz Langevin type transducer at standing wave conditions inside the water-filled cuvette. The NMR relaxation parameter T2 was measured using CPMG sequences to obtain information about the amount of Freon in dissolved and free states before, during, and after cavitation. The signal intensity of the dissolved Freon was saturated by a short recovery delay (1s) to attenuate signal to 32% of its initial intensity. The saturation delay was incremented from 10ms to 1s. It was observed that amount of observable gas inside the cuvette was slightly above the noise level before the cavitation, while the amount of free gas increased after initiation of cavitation. Result shows that signal intensity increase due to the presence of larger gas bubble.

Keywords


Cavitation; Magnetic resonance imaging; Parameter estimation; Relaxation processes; Gas bubbles; Saturation delay; Signal intensity

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