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CFD simulation of gas – liquid – liquid three - phase flow in an annular centrifugal contactor / Shaowei Li in Industrial & engineering chemistry research, Vol. 51 N° 34 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 34 (Août 2012) . - pp. 11245–11253 Titre : CFD simulation of gas – liquid – liquid three - phase flow in an annular centrifugal contactor Type de document : texte imprimé Auteurs : Shaowei Li, Auteur ; Wuhua Duan, Auteur ; Jing Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 11245–11253 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Gas  liquid Résumé : A computational fluid dynamics (CFD) simulation of gas–liquid–liquid three-phase flow was carried out on an annular centrifugal contactor. An Euler–Euler, volume-of-fluid, multiphase-flow model was used for the three-phase flow simulation. The three-phase flow behaviors in the open and sealed inlet operation modes were investigated under various operating conditions. The location and morphology of the aqueous/organic interface were discussed in detail in light of the simulated pressure distribution. An interesting bistability phenomenon was observed in the simulation. The throughput of the annular centrifugal contactor was obtained from the simulation under various phase ratios and compared with experimental results. Excellent agreement was obtained, supporting the validity of the simulation method. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300821t [article] CFD simulation of gas – liquid – liquid three - phase flow in an annular centrifugal contactor [texte imprimé] / Shaowei Li, Auteur ; Wuhua Duan, Auteur ; Jing Chen, Auteur . - 2012 . - pp. 11245–11253. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 34 (Août 2012) . - pp. 11245–11253 Mots-clés : Gas  liquid Résumé : A computational fluid dynamics (CFD) simulation of gas–liquid–liquid three-phase flow was carried out on an annular centrifugal contactor. An Euler–Euler, volume-of-fluid, multiphase-flow model was used for the three-phase flow simulation. The three-phase flow behaviors in the open and sealed inlet operation modes were investigated under various operating conditions. The location and morphology of the aqueous/organic interface were discussed in detail in light of the simulated pressure distribution. An interesting bistability phenomenon was observed in the simulation. The throughput of the annular centrifugal contactor was obtained from the simulation under various phase ratios and compared with experimental results. Excellent agreement was obtained, supporting the validity of the simulation method. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300821t

Determination and correlation of solubility of decahydropyrazino [2,3 - b] pyrazine in methanol, ethanol, and 2 - propanol / Jing Chen in Industrial & engineering chemistry research, Vol. 50 N° 20 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11755-11762 Titre : Determination and correlation of solubility of decahydropyrazino [2,3 - b] pyrazine in methanol, ethanol, and 2 - propanol Type de document : texte imprimé Auteurs : Jing Chen, Auteur ; Zuo-Xiang Zeng, Auteur ; Wei-Lan Xue, Auteur Année de publication : 2011 Article en page(s) : pp. 11755-11762 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Solubility  Correlation  analysis  Correlation Résumé : The solubilities of decahydropyrazino[2,3-b]pyrazine (DHPP) in methanol, ethanol, and 2-propanol were measured at temperatures ranging from 274.95 to 354.75 K. The last crystal disappearance method was used to determine the solubility of DHPP. The experimental data were correlated by the van't Hoff plot, λh (Buchowski) equation, modified Apelblat equation, and two local composition models (Wilson and NRTL). Moreover, the densities of (DHPP + water) solution were measured from 274.25 to 355.95 K, and the liquid molar volume of DHPP, Vml (T), was obtained and used to calculate the parameters in the Wilson model. It was found that NRTL model gave the best correlation results. On the basis of the NRTL model and experimental data, the thermodynamic excess functions (ΔGE, ΔSE, and ΔHE) of DHPP + alcohols (methanol, ethanol, and 2-propanol) systems were determined. Furthermore, the infinite-dilution activity coefficient and the infinite-dilution reduced excess enthalpy (γ∞1 and ΔH∞E1) were derived. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24612403 [article] Determination and correlation of solubility of decahydropyrazino [2,3 - b] pyrazine in methanol, ethanol, and 2 - propanol [texte imprimé] / Jing Chen, Auteur ; Zuo-Xiang Zeng, Auteur ; Wei-Lan Xue, Auteur . - 2011 . - pp. 11755-11762. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11755-11762 Mots-clés : Solubility  Correlation  analysis  Correlation Résumé : The solubilities of decahydropyrazino[2,3-b]pyrazine (DHPP) in methanol, ethanol, and 2-propanol were measured at temperatures ranging from 274.95 to 354.75 K. The last crystal disappearance method was used to determine the solubility of DHPP. The experimental data were correlated by the van't Hoff plot, λh (Buchowski) equation, modified Apelblat equation, and two local composition models (Wilson and NRTL). Moreover, the densities of (DHPP + water) solution were measured from 274.25 to 355.95 K, and the liquid molar volume of DHPP, Vml (T), was obtained and used to calculate the parameters in the Wilson model. It was found that NRTL model gave the best correlation results. On the basis of the NRTL model and experimental data, the thermodynamic excess functions (ΔGE, ΔSE, and ΔHE) of DHPP + alcohols (methanol, ethanol, and 2-propanol) systems were determined. Furthermore, the infinite-dilution activity coefficient and the infinite-dilution reduced excess enthalpy (γ∞1 and ΔH∞E1) were derived. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24612403

Measurement and correlation of the solubility of ammonia in ethanol between 277.35 and 318.25 K / Zuo-Xiang Zeng in Industrial & engineering chemistry research, Vol. 50 N° 6 (Mars 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 6 (Mars 2011) . - pp. 3592–3597 Titre : Measurement and correlation of the solubility of ammonia in ethanol between 277.35 and 318.25 K Type de document : texte imprimé Auteurs : Zuo-Xiang Zeng, Auteur ; Jing Chen, Auteur ; Wei-Lan Xue, Auteur Année de publication : 2011 Article en page(s) : pp. 3592–3597 Langues : Anglais (eng) Mots-clés : Solubility  ammonia  Ethanol Résumé : The solubility of ammonia in ethanol was measured by a static−analytic method. The total pressure is up to about 0.4 MPa, and temperature ranges from (277.35 to 318.25) K. The relationship between the partial molar volume of ammonia infinitely diluted in ethanol and temperature is obtained by measuring the density of (ethanol + ammonia) solution. The experimental results are used to determine the (molality scale based) Henry’s constant of ammonia in ethanol, where the activity in the liquid phase is calculated by applying the molality scale based Gibbs excess energy model of Pitzer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102089x [article] Measurement and correlation of the solubility of ammonia in ethanol between 277.35 and 318.25 K [texte imprimé] / Zuo-Xiang Zeng, Auteur ; Jing Chen, Auteur ; Wei-Lan Xue, Auteur . - 2011 . - pp. 3592–3597. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 6 (Mars 2011) . - pp. 3592–3597 Mots-clés : Solubility  ammonia  Ethanol Résumé : The solubility of ammonia in ethanol was measured by a static−analytic method. The total pressure is up to about 0.4 MPa, and temperature ranges from (277.35 to 318.25) K. The relationship between the partial molar volume of ammonia infinitely diluted in ethanol and temperature is obtained by measuring the density of (ethanol + ammonia) solution. The experimental results are used to determine the (molality scale based) Henry’s constant of ammonia in ethanol, where the activity in the liquid phase is calculated by applying the molality scale based Gibbs excess energy model of Pitzer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102089x

Stars and Misfits / Thomas Åstebro in Management science, Vol. 57 N° 11 (Novembre 2011) 

Public ISBD [article]  in Management science > Vol. 57 N° 11 (Novembre 2011) . - pp. 1999-2017 Titre : Stars and Misfits : Self-Employment and Labor Market Frictions Type de document : texte imprimé Auteurs : Thomas Åstebro, Auteur ; Jing Chen, Auteur ; Peter Thompson, Auteur Année de publication : 2012 Article en page(s) : pp. 1999-2017 Note générale : Management Langues : Anglais (eng) Mots-clés : Entrepreneurship  Self-employment  Jack-of-all-trades  Skill  complementarity Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : Recent evidence has shown that entrants into self-employment are disproportionately drawn from the tails of the earnings and ability distributions. This observation is explained by a multitask model of occupational choice in which frictions in the labor market induce mismatches between firms and workers, and misassignment of workers to tasks. The model also yields distinctive predictions relating prior work histories to earnings and to the probability of entry into self-employment. These predictions are tested with the Korean Labor and Income Panel Study, from which we find considerable support for the model. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/57/11/1999.abstract [article] Stars and Misfits : Self-Employment and Labor Market Frictions [texte imprimé] / Thomas Åstebro, Auteur ; Jing Chen, Auteur ; Peter Thompson, Auteur . - 2012 . - pp. 1999-2017. Management Langues : Anglais (eng) in Management science > Vol. 57 N° 11 (Novembre 2011) . - pp. 1999-2017 Mots-clés : Entrepreneurship  Self-employment  Jack-of-all-trades  Skill  complementarity Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : Recent evidence has shown that entrants into self-employment are disproportionately drawn from the tails of the earnings and ability distributions. This observation is explained by a multitask model of occupational choice in which frictions in the labor market induce mismatches between firms and workers, and misassignment of workers to tasks. The model also yields distinctive predictions relating prior work histories to earnings and to the probability of entry into self-employment. These predictions are tested with the Korean Labor and Income Panel Study, from which we find considerable support for the model. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/57/11/1999.abstract

State-space model for dynamic behavior of vapor compression liquid chiller / Ye, Yao in International journal of refrigeration, Vol. 36 N° 8 (Décembre 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 8 (Décembre 2013) . - pp. 2128–2147 Titre : State-space model for dynamic behavior of vapor compression liquid chiller Titre original : Modèle espace-état du comportement dynamique d’une refroidisseur de liquide à compression de vapeur Type de document : texte imprimé Auteurs : Ye, Yao, Auteur ; Mengwei, Huang, Auteur ; Jing Chen, Auteur Année de publication : 2014 Article en page(s) : pp. 2128–2147 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : State-space  model;  dynamic  response;  vapor  compression;  liquid  chiller;  R-134A Résumé : A state-space model has been developed to investigate the dynamic behaviors of refrigeration system. By using vector-matrix notation and linearization, the ordinary differential equations describing the chiller's dynamic thermal behaviors are transformed into a representation form of the state space. The model has been validated by a series of dynamic response experiments of a chiller with the refrigerant R-134a. The average errors of the model results compared with the experimental data are all less than 10% in the experimental cases. Afterward, the model is used to investigate the transient behaviors of the exit cold carrier temperature of evaporator under different A disturbances. The state-space model developed in this study helps us have a good idea of the dynamic performance of a refrigeration system under transient conditions and design optimized control strategies for a high-energy-efficiency HVAC system. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001187 [article] State-space model for dynamic behavior of vapor compression liquid chiller = Modèle espace-état du comportement dynamique d’une refroidisseur de liquide à compression de vapeur [texte imprimé] / Ye, Yao, Auteur ; Mengwei, Huang, Auteur ; Jing Chen, Auteur . - 2014 . - pp. 2128–2147. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 8 (Décembre 2013) . - pp. 2128–2147 Mots-clés : State-space  model;  dynamic  response;  vapor  compression;  liquid  chiller;  R-134A Résumé : A state-space model has been developed to investigate the dynamic behaviors of refrigeration system. By using vector-matrix notation and linearization, the ordinary differential equations describing the chiller's dynamic thermal behaviors are transformed into a representation form of the state space. The model has been validated by a series of dynamic response experiments of a chiller with the refrigerant R-134a. The average errors of the model results compared with the experimental data are all less than 10% in the experimental cases. Afterward, the model is used to investigate the transient behaviors of the exit cold carrier temperature of evaporator under different A disturbances. The state-space model developed in this study helps us have a good idea of the dynamic performance of a refrigeration system under transient conditions and design optimized control strategies for a high-energy-efficiency HVAC system. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001187