Documents disponibles écrits par cet auteur

Characterisation of ice and THF hydrate slurry crystal size distribution by microscopic observation method / Anthony Delahaye in International journal of refrigeration, Vol. 33 N° 8 (Décembre 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 8 (Décembre 2010) . - pp. 1639-1647 Titre : Characterisation of ice and THF hydrate slurry crystal size distribution by microscopic observation method : Caractérisation de la distribution en taille de cristaux de coulis de glace et d’hydrate de THF par une méthode d’observation microscopique Type de document : texte imprimé Auteurs : Anthony Delahaye, Auteur ; Laurence Fournaison, Auteur ; Guilpart, Jacques, Auteur Année de publication : 2011 Article en page(s) : pp. 1639-1647 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Ice  slurry  Hydrate  Tetrahydrofuran  Particle  Crystal  Distribution Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The objective of the present work is to characterise, using an experimental microscopic observation device, the crystal size distribution (CSD) of ice and tetrahydrofuran (THF) hydrate slurries, which can be used as two-phase refrigerant fluids for cold transportation and storage in the field of secondary refrigeration. Three different solutes (ethanol, propylene glycol and sodium chloride) were used to form ice slurries. The studied hydrate was THF hydrate since it is stable at atmospheric pressure and in a temperature range suitable for refrigeration and air-conditioning applications. Experimental ice and THF hydrate slurry CSDs were compared to classical normal (Gaussian), log-normal, gamma, and Weibull (Rosin–Rammler) distributions. A comparison between ice and THF hydrate slurry CSD results showed that hydrate slurries were composed of crystals approximately 1.5 times smaller than ice crystals. The present results were shown to be useful input parameters for modelling thermophysical properties of slurry systems. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000873 [article] Characterisation of ice and THF hydrate slurry crystal size distribution by microscopic observation method : Caractérisation de la distribution en taille de cristaux de coulis de glace et d’hydrate de THF par une méthode d’observation microscopique [texte imprimé] / Anthony Delahaye, Auteur ; Laurence Fournaison, Auteur ; Guilpart, Jacques, Auteur . - 2011 . - pp. 1639-1647. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 8 (Décembre 2010) . - pp. 1639-1647 Mots-clés : Ice  slurry  Hydrate  Tetrahydrofuran  Particle  Crystal  Distribution Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The objective of the present work is to characterise, using an experimental microscopic observation device, the crystal size distribution (CSD) of ice and tetrahydrofuran (THF) hydrate slurries, which can be used as two-phase refrigerant fluids for cold transportation and storage in the field of secondary refrigeration. Three different solutes (ethanol, propylene glycol and sodium chloride) were used to form ice slurries. The studied hydrate was THF hydrate since it is stable at atmospheric pressure and in a temperature range suitable for refrigeration and air-conditioning applications. Experimental ice and THF hydrate slurry CSDs were compared to classical normal (Gaussian), log-normal, gamma, and Weibull (Rosin–Rammler) distributions. A comparison between ice and THF hydrate slurry CSD results showed that hydrate slurries were composed of crystals approximately 1.5 times smaller than ice crystals. The present results were shown to be useful input parameters for modelling thermophysical properties of slurry systems. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000873

Characterization of CO2 hydrate formation and dissociation kinetics in a flow loop / Salem Jerbi in International journal of refrigeration, Vol. 33 N° 8 (Décembre 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 8 (Décembre 2010) . - pp. 1625-1631 Titre : Characterization of CO2 hydrate formation and dissociation kinetics in a flow loop Titre original : Caractérisation des cinétiques de formation et de dissociation des hydrates de CO2 dans une boucle de circulation Type de document : texte imprimé Auteurs : Salem Jerbi, Auteur ; Anthony Delahaye, Auteur ; Laurence Fournaison, Auteur Année de publication : 2011 Article en page(s) : pp. 1625-1631 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Kinetics  Formation  Dissociation  CO2  hydrate  Additives  Experimental  loop Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The objective of this work is to investigate CO2 hydrate formation and dissociation kinetics in the aim of designing a circulation loop with heat exchangers for secondary refrigeration applications. The formation of gas hydrates is a crystallization process which requires a supersaturated environment. The majority of the experimental formation data from the literature were obtained in semi-batch stirred tank. It was found that the hydrate growth for CO2 hydrate formation was approximately 1.8 × 10−3 %hydrate.s−1 for a stirring velocity about 450 rpm. The study reveals that for our system, an isothermal circulation loop, the kinetic varied from 4.3 × 10−3 to 8.3 × 10−3 %hydrate s−1, respectively for two protocols with water and water-additives selected for their dispersive and promoter properties. The first results of CO2 hydrate dissociation kinetics with or without additives were equivalent with various systems (semi-batch stirred tank reactor or loop) with approximately 5 × 10−3 %hydrate s−1. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002070 [article] Characterization of CO2 hydrate formation and dissociation kinetics in a flow loop = Caractérisation des cinétiques de formation et de dissociation des hydrates de CO2 dans une boucle de circulation [texte imprimé] / Salem Jerbi, Auteur ; Anthony Delahaye, Auteur ; Laurence Fournaison, Auteur . - 2011 . - pp. 1625-1631. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 8 (Décembre 2010) . - pp. 1625-1631 Mots-clés : Kinetics  Formation  Dissociation  CO2  hydrate  Additives  Experimental  loop Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The objective of this work is to investigate CO2 hydrate formation and dissociation kinetics in the aim of designing a circulation loop with heat exchangers for secondary refrigeration applications. The formation of gas hydrates is a crystallization process which requires a supersaturated environment. The majority of the experimental formation data from the literature were obtained in semi-batch stirred tank. It was found that the hydrate growth for CO2 hydrate formation was approximately 1.8 × 10−3 %hydrate.s−1 for a stirring velocity about 450 rpm. The study reveals that for our system, an isothermal circulation loop, the kinetic varied from 4.3 × 10−3 to 8.3 × 10−3 %hydrate s−1, respectively for two protocols with water and water-additives selected for their dispersive and promoter properties. The first results of CO2 hydrate dissociation kinetics with or without additives were equivalent with various systems (semi-batch stirred tank reactor or loop) with approximately 5 × 10−3 %hydrate s−1. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002070

Rheological properties of CO2 hydrate slurry flow in the presence of additives / Anthony Delahaye in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8344-8353 Titre : Rheological properties of CO2 hydrate slurry flow in the presence of additives Type de document : texte imprimé Auteurs : Anthony Delahaye, Auteur ; Laurence Fournaison, Auteur ; Salem Jerbi, Auteur Année de publication : 2011 Article en page(s) : pp. 8344-8353 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Additive  Particle  suspension  Multiphase  flow  Carbon  dioxide  Rheological  properties Résumé : This work investigates the flow properties of CO2 hydrate slurry in dynamic loop in the presence of additives (surfactants, antiagglomerants) for use as two-phase secondary refrigerant. To be considered as suitable for refrigeration systems, the use of hydrate slurries must overcome instability phenomena such as hydrate particle agglomeration. The additives were employed in the present work to prevent this phenomena, and thus to improve the stability and the homogeneity of the fluid. A multicriterion approach was used to select additive and to define the optimal operating conditions for its use. The selected additive was an EO/PO block copolymer. The flow properties of CO2 hydrate slurry in aqueous media in the presence of this additive were then measured in an experimental loop. It was possible to model the rheological behavior of the CO2 hydrate slurry in the presence of EO/PO block copolymer by an Newtonian-type equation. The present results were compared to previous results obtained without additive. This article provides new information on CO2-hydrate slurry rheology, which is important not only in the development of hydrate-based refrigeration systems, but also in the field of flow assurance in oil and gas pipelines or for other applications such as gas purification and storage processes using clathrate hydrates. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332161 [article] Rheological properties of CO2 hydrate slurry flow in the presence of additives [texte imprimé] / Anthony Delahaye, Auteur ; Laurence Fournaison, Auteur ; Salem Jerbi, Auteur . - 2011 . - pp. 8344-8353. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8344-8353 Mots-clés : Additive  Particle  suspension  Multiphase  flow  Carbon  dioxide  Rheological  properties Résumé : This work investigates the flow properties of CO2 hydrate slurry in dynamic loop in the presence of additives (surfactants, antiagglomerants) for use as two-phase secondary refrigerant. To be considered as suitable for refrigeration systems, the use of hydrate slurries must overcome instability phenomena such as hydrate particle agglomeration. The additives were employed in the present work to prevent this phenomena, and thus to improve the stability and the homogeneity of the fluid. A multicriterion approach was used to select additive and to define the optimal operating conditions for its use. The selected additive was an EO/PO block copolymer. The flow properties of CO2 hydrate slurry in aqueous media in the presence of this additive were then measured in an experimental loop. It was possible to model the rheological behavior of the CO2 hydrate slurry in the presence of EO/PO block copolymer by an Newtonian-type equation. The present results were compared to previous results obtained without additive. This article provides new information on CO2-hydrate slurry rheology, which is important not only in the development of hydrate-based refrigeration systems, but also in the field of flow assurance in oil and gas pipelines or for other applications such as gas purification and storage processes using clathrate hydrates. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332161