Documents disponibles écrits par cet auteur

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

Numerical study of flow deflection and horseshoe vortices in a louvered fin round tube heat exchanger / H. Huisseune in Journal of heat transfer, Vol 134 N° 9 (Septembre 2012) 

Public ISBD [article]  in Journal of heat transfer > Vol 134 N° 9 (Septembre 2012) . - 11 p. Titre : Numerical study of flow deflection and horseshoe vortices in a louvered fin round tube heat exchanger Type de document : texte imprimé Auteurs : H. Huisseune, Auteur ; C. T'Joen, Auteur ; P. De Jaeger, Auteur Année de publication : 2012 Article en page(s) : 11 p. Note générale : heat transfer Langues : Anglais (eng) Mots-clés : louvered  fin  heat  exchanger;  round  tube;  simulation;  flow  deflection;  horseshoe  vortex Index. décimale : 536 Chaleur. Thermodynamique Résumé : In louvered fin heat exchangers, the flow deflection influences the heat transfer rate and pressure drop and thus the heat exchanger's performance. To date, studies of the flow deflection are two-dimensional, which is an acceptable approximation for flat tube heat exchangers (typical for automotive applications). However, in louvered fin heat exchangers with round tubes, which are commonly used in air-conditioning devices and heat pumps, the flow is three-dimensional throughout the whole heat exchanger. In this study, three-dimensional numerical simulations were performed to investigate the flow deflection and horseshoe vortex development in a louvered fin round tube heat exchanger with three tube rows in a staggered layout. The numerical simulations were validated against the experimental data. It was found that the flow deflection is affected by the tubes in the same tube row (intratube row effect) and by the tubes in the upstream tube rows (intertube row effect). Flow efficiency values obtained with two-dimensional studies are representative only for the flow behavior in the first tube row of a staggered louvered fin heat exchanger with round tubes. The flow behavior in the louvered elements of the subsequent tube rows differs strongly due to its three-dimensional nature. Furthermore, it was found that the flow deflection affects the local pressure distributions upstream of the tubes of the downstream tube rows and thus the horseshoe vortex development at these locations. The results of this study are important because the flow behavior is related to the thermal hydraulic performance of the heat exchanger. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000009 [...] [article] Numerical study of flow deflection and horseshoe vortices in a louvered fin round tube heat exchanger [texte imprimé] / H. Huisseune, Auteur ; C. T'Joen, Auteur ; P. De Jaeger, Auteur . - 2012 . - 11 p. heat transfer Langues : Anglais (eng) in Journal of heat transfer > Vol 134 N° 9 (Septembre 2012) . - 11 p. Mots-clés : louvered  fin  heat  exchanger;  round  tube;  simulation;  flow  deflection;  horseshoe  vortex Index. décimale : 536 Chaleur. Thermodynamique Résumé : In louvered fin heat exchangers, the flow deflection influences the heat transfer rate and pressure drop and thus the heat exchanger's performance. To date, studies of the flow deflection are two-dimensional, which is an acceptable approximation for flat tube heat exchangers (typical for automotive applications). However, in louvered fin heat exchangers with round tubes, which are commonly used in air-conditioning devices and heat pumps, the flow is three-dimensional throughout the whole heat exchanger. In this study, three-dimensional numerical simulations were performed to investigate the flow deflection and horseshoe vortex development in a louvered fin round tube heat exchanger with three tube rows in a staggered layout. The numerical simulations were validated against the experimental data. It was found that the flow deflection is affected by the tubes in the same tube row (intratube row effect) and by the tubes in the upstream tube rows (intertube row effect). Flow efficiency values obtained with two-dimensional studies are representative only for the flow behavior in the first tube row of a staggered louvered fin heat exchanger with round tubes. The flow behavior in the louvered elements of the subsequent tube rows differs strongly due to its three-dimensional nature. Furthermore, it was found that the flow deflection affects the local pressure distributions upstream of the tubes of the downstream tube rows and thus the horseshoe vortex development at these locations. The results of this study are important because the flow behavior is related to the thermal hydraulic performance of the heat exchanger. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000009 [...]

Thermal hydraulic study of a single row heat exchanger with helically finned tubes / H. Huisseune in Journal of heat transfer, Vol. 132 N° 6 (Juin 2010) 

Public ISBD [article]  in Journal of heat transfer > Vol. 132 N° 6 (Juin 2010) . - pp. [061801-1/8] Titre : Thermal hydraulic study of a single row heat exchanger with helically finned tubes Type de document : texte imprimé Auteurs : H. Huisseune, Auteur ; C. T'Joen, Auteur ; P. Brodeoux, Auteur Article en page(s) : pp. [061801-1/8] Note générale : Physique Langues : Anglais (eng) Mots-clés : Helical  fin  Single  row  Heat  exchanger  Heat  transfer  Friction Index. décimale : 536 Chaleur. Thermodynamique Résumé : In this study, the heat transfer and friction correlation of a single row heat exchanger with helically finned tubes are experimentally determined. The transversal tube pitch was parametrically varied. A detailed description of the test rig and the data reduction procedure is given. A thorough uncertainty analysis was performed to validate the results. The proposed heat transfer correlation can describe 95% of the data within ±11% and shows a 4.49% mean deviation. The friction correlation predicts 95% of the data within ±19% with a mean deviation of 6.84%. The new correlations show the same trend as most correlations from open literature, but none of the literature correlations are able to accurately predict the results of this study. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Thermal hydraulic study of a single row heat exchanger with helically finned tubes [texte imprimé] / H. Huisseune, Auteur ; C. T'Joen, Auteur ; P. Brodeoux, Auteur . - pp. [061801-1/8]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 6 (Juin 2010) . - pp. [061801-1/8] Mots-clés : Helical  fin  Single  row  Heat  exchanger  Heat  transfer  Friction Index. décimale : 536 Chaleur. Thermodynamique Résumé : In this study, the heat transfer and friction correlation of a single row heat exchanger with helically finned tubes are experimentally determined. The transversal tube pitch was parametrically varied. A detailed description of the test rig and the data reduction procedure is given. A thorough uncertainty analysis was performed to validate the results. The proposed heat transfer correlation can describe 95% of the data within ±11% and shows a 4.49% mean deviation. The friction correlation predicts 95% of the data within ±19% with a mean deviation of 6.84%. The new correlations show the same trend as most correlations from open literature, but none of the literature correlations are able to accurately predict the results of this study. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]