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Sound speed properties of phase transition processes

Sound speed properties of phase transition processes. Precipitation of solids in hydrocarbon liquids (e.g. wax) and hydrocarbon – water systems (e.g. hydrates). Ultrasonic analysis of wax and hydrate properties. Steel container. Ultrasonic probe (transducer). Electronics.

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Sound speed properties of phase transition processes

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  1. Sound speed properties of phase transition processes Precipitation of solids in hydrocarbon liquids (e.g. wax) and hydrocarbon – water systems (e.g. hydrates)

  2. Ultrasonic analysis of wax and hydrate properties Steel container Ultrasonic probe (transducer) Electronics E.g. Gas hydrate system PC In this project an ultrasonic beam will be used to study sound speed and attenuation caused by precipitation of solids (e.g. wax, gas hydrates) in a special made container (“cell”). The aim is to be able to detect freezing point and physical properties of the solid – liquid system based on the ultrasonic method. The sound beam is sent from the probe through the container wall into the liquid – solid suspension. The beam is reflected from the far end wall and reflected back to the probe. The sound speed is typically 1500 m/s in a liquid system, and e.g. several thousand m/s in ice, depending on properties. Thus it is possible to discriminate liquid and frozen state and intermediate stages. Also the sonic speed and acoustic impedance is correlated with the elastic properties of the medium and thus may give information about the hydrate mechanical strength. Building the cell is part of the project. All other instrumentation is ready for use and has been used successfully in various projects. Methods and measurements will be compared with other published works. Supervisors : Thor Martin Svartås and Rune W. Time

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