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Ultrasonic determination of the particle concentration in model suspensions and ice slurry / V. Langlois in International journal of refrigeration, Vol. 34 N° 8 (Décembre 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 1972–1979 Titre : Ultrasonic determination of the particle concentration in model suspensions and ice slurry Titre original : Détermination à l’aide d’ultrasons de la concentration des particules dans les suspensions et les coulis de glace modélisés Type de document : texte imprimé Auteurs : V. Langlois, Auteur ; W. Gautherin, Auteur ; J. Laurent, Auteur Année de publication : 2012 Article en page(s) : pp. 1972–1979 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Ultrasound  Sound  velocity  Concentration  Ice  slurry Résumé : The development of ice slurry for refrigeration systems and the enhancement of its efficiency depend on an accurate control of the ice concentration. We present here an ultrasonic method capable to measure precisely the particle concentration in ice slurry. To calibrate the ultrasonic measurement, we first determine the sound velocity and attenuation in two model suspensions (glass beads/polyethylene glycol and polyethylene beads/vaseline oil) for different particle volume fractions. The experimental results show a good agreement with the predictions of the two-component models in the long-wavelength limit. Additionally, the sound attenuation reveals a clear signature of the aggregate formation in the nearly iso-dense suspension. We next conduct the measurement of the sound velocity in the polypropylene glycol ice slurry where the ice concentration changes with temperature. The ice concentrations extracted from our sound velocity measurements are well consistent with the values determined from the binary phase diagram. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071100154X [article] Ultrasonic determination of the particle concentration in model suspensions and ice slurry = Détermination à l’aide d’ultrasons de la concentration des particules dans les suspensions et les coulis de glace modélisés [texte imprimé] / V. Langlois, Auteur ; W. Gautherin, Auteur ; J. Laurent, Auteur . - 2012 . - pp. 1972–1979. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 1972–1979 Mots-clés : Ultrasound  Sound  velocity  Concentration  Ice  slurry Résumé : The development of ice slurry for refrigeration systems and the enhancement of its efficiency depend on an accurate control of the ice concentration. We present here an ultrasonic method capable to measure precisely the particle concentration in ice slurry. To calibrate the ultrasonic measurement, we first determine the sound velocity and attenuation in two model suspensions (glass beads/polyethylene glycol and polyethylene beads/vaseline oil) for different particle volume fractions. The experimental results show a good agreement with the predictions of the two-component models in the long-wavelength limit. Additionally, the sound attenuation reveals a clear signature of the aggregate formation in the nearly iso-dense suspension. We next conduct the measurement of the sound velocity in the polypropylene glycol ice slurry where the ice concentration changes with temperature. The ice concentrations extracted from our sound velocity measurements are well consistent with the values determined from the binary phase diagram. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071100154X