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Flow regime based calibration of a capacitive void fraction sensor for small diameter tubes / K. De Kerpel in International journal of refrigeration, Vol. 36 N° 2 (N° spécial) (Mars 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 390–401 Titre : Flow regime based calibration of a capacitive void fraction sensor for small diameter tubes Titre original : Etalonnage fondé sur le régime d'écoulement d'un capteur du taux de vide capacitif pour les tubes de faible diamètre Type de document : texte imprimé Auteurs : K. De Kerpel, Auteur ; B. Ameel, Auteur ; C. T'Joen, Auteur Année de publication : 2013 Article en page(s) : pp. 390–401 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Two-phase  flow;  Void  fraction;  Capacitance;  Flow  regime Résumé : The void fraction measurement technique used in this work is based on measuring the capacity between two electrodes. The electrodes are curved so they closely fit to the tube wall; due to this the measured capacitance is influenced by the spatial distribution of the phases and not only the void fraction. Hence, the measured capacitance does not linearly vary with the void fraction. In this work a method is proposed to account for the distribution of the phases and thus determine the void fraction based on capacitive measurements. The proposed method was applied to 270 measurement points. The tube diameter D is 8 mm, the mass flux ranges from 200 to 500 kg m−2s−1 and the vapour fraction ranges between 2.5% and 97.5%. Refrigerants R134a and R410A were used. The results were compared to the Steiner version of the Rouhani–Axelsson drift flux void fraction model. A very good agreement with this model was observed. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002708 [article] Flow regime based calibration of a capacitive void fraction sensor for small diameter tubes = Etalonnage fondé sur le régime d'écoulement d'un capteur du taux de vide capacitif pour les tubes de faible diamètre [texte imprimé] / K. De Kerpel, Auteur ; B. Ameel, Auteur ; C. T'Joen, Auteur . - 2013 . - pp. 390–401. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 390–401 Mots-clés : Two-phase  flow;  Void  fraction;  Capacitance;  Flow  regime Résumé : The void fraction measurement technique used in this work is based on measuring the capacity between two electrodes. The electrodes are curved so they closely fit to the tube wall; due to this the measured capacitance is influenced by the spatial distribution of the phases and not only the void fraction. Hence, the measured capacitance does not linearly vary with the void fraction. In this work a method is proposed to account for the distribution of the phases and thus determine the void fraction based on capacitive measurements. The proposed method was applied to 270 measurement points. The tube diameter D is 8 mm, the mass flux ranges from 200 to 500 kg m−2s−1 and the vapour fraction ranges between 2.5% and 97.5%. Refrigerants R134a and R410A were used. The results were compared to the Steiner version of the Rouhani–Axelsson drift flux void fraction model. A very good agreement with this model was observed. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002708