Documents disponibles écrits par cet auteur

Analysis of particle segregation and intermixing in solid−liquid fluidized beds / Prakash V Chavan in Industrial & engineering chemistry research, Vol. 47 n°21 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8458–8470 Titre : Analysis of particle segregation and intermixing in solid−liquid fluidized beds Type de document : texte imprimé Auteurs : Prakash V Chavan, Auteur ; Jyeshtharaj B. Joshi, Auteur Année de publication : 2008 Article en page(s) : p. 8458–8470 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Analysis  of  particl Résumé : Particle segregation and intermixing have been studied in 50 mm i.d. and 1.2 m long solid−liquid fluidized bed (SLFB). An ion-exchange resin was used as a solid phase in five size ranges with average particle sizes (dry basis) of 427, 500, 605, 725, and 855 μm. Expansion characteristics of beds were investigated separately for all the particle sizes. The expansion characteristics were also investigated using 2, 3, 4, and 5 sizes having all the combinations among 427, 500, 605, 725, and 855 μm. In all cases, the concentration profiles of the individual sizes were measured along the bed height. The segregation velocity of dense and light particle was predicted and compared with experimental results for binary mixtures. Criteria have been developed for segregation/intermixing in laminar (Re∞ < 0.1), transition (0.1 < Re∞ < 500), and turbulent (Re∞ > 500) regimes for binary particle systems. The solid dispersion coefficient has also been evaluated for each particle size present in the mixture of particles of different sizes at given operating conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800504z [article] Analysis of particle segregation and intermixing in solid−liquid fluidized beds [texte imprimé] / Prakash V Chavan, Auteur ; Jyeshtharaj B. Joshi, Auteur . - 2008 . - p. 8458–8470. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8458–8470 Mots-clés : Analysis  of  particl Résumé : Particle segregation and intermixing have been studied in 50 mm i.d. and 1.2 m long solid−liquid fluidized bed (SLFB). An ion-exchange resin was used as a solid phase in five size ranges with average particle sizes (dry basis) of 427, 500, 605, 725, and 855 μm. Expansion characteristics of beds were investigated separately for all the particle sizes. The expansion characteristics were also investigated using 2, 3, 4, and 5 sizes having all the combinations among 427, 500, 605, 725, and 855 μm. In all cases, the concentration profiles of the individual sizes were measured along the bed height. The segregation velocity of dense and light particle was predicted and compared with experimental results for binary mixtures. Criteria have been developed for segregation/intermixing in laminar (Re∞ < 0.1), transition (0.1 < Re∞ < 500), and turbulent (Re∞ > 500) regimes for binary particle systems. The solid dispersion coefficient has also been evaluated for each particle size present in the mixture of particles of different sizes at given operating conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800504z

Cfd simulation of bubble column reactor using population balance / Kalekudithi Ekambara in Industrial & engineering chemistry research, Vol. 47 n°21 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8505–8516 Titre : Cfd simulation of bubble column reactor using population balance Type de document : texte imprimé Auteurs : Kalekudithi Ekambara, Auteur ; Kumar Nandakuma, Auteur ; Jyeshtharaj B. Joshi, Auteur Année de publication : 2008 Article en page(s) : p. 8505–8516 Langues : Anglais (eng) Résumé : In this paper, we have presented a comprehensive analysis of the development of flow pattern in a bubble column reactor by the introduction of a population balance equation combined with the three-dimensional two-fluid model (Reynolds stress model). The multiple size group (MUSIG) model has been used to account for the nonuniform bubble size distribution in a gas−liquid mixture. The coalescence and breakage effects of the gas bubbles are modeled according to the coalescence by the random collision driven by turbulence and wake entrainment while for bubble breakage by the impact of turbulent eddies. Local radial distributions of the gas hold-up, Sauter mean bubble diameter, axial liquid velocity, turbulent kinetic energy, turbulent energy dissipation rate, and Reynolds stresses for superficial gas velocity of 20 mm/s are compared against experimental data in a bubble column reactor. The development of flow pattern were examined at six axial locations H/D = 0.2, 1.4, 2.6, 3.9, 5.0, and 6.2. Good quantitative agreement with the experimental data is obtained with three different models (i.e., k−ε, RSM with constant bubble size, and RSM with population balance). The model prediction shows better agreement with the experimental data with population balance than constant bubble diameter predictions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071393e [article] Cfd simulation of bubble column reactor using population balance [texte imprimé] / Kalekudithi Ekambara, Auteur ; Kumar Nandakuma, Auteur ; Jyeshtharaj B. Joshi, Auteur . - 2008 . - p. 8505–8516. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8505–8516 Résumé : In this paper, we have presented a comprehensive analysis of the development of flow pattern in a bubble column reactor by the introduction of a population balance equation combined with the three-dimensional two-fluid model (Reynolds stress model). The multiple size group (MUSIG) model has been used to account for the nonuniform bubble size distribution in a gas−liquid mixture. The coalescence and breakage effects of the gas bubbles are modeled according to the coalescence by the random collision driven by turbulence and wake entrainment while for bubble breakage by the impact of turbulent eddies. Local radial distributions of the gas hold-up, Sauter mean bubble diameter, axial liquid velocity, turbulent kinetic energy, turbulent energy dissipation rate, and Reynolds stresses for superficial gas velocity of 20 mm/s are compared against experimental data in a bubble column reactor. The development of flow pattern were examined at six axial locations H/D = 0.2, 1.4, 2.6, 3.9, 5.0, and 6.2. Good quantitative agreement with the experimental data is obtained with three different models (i.e., k−ε, RSM with constant bubble size, and RSM with population balance). The model prediction shows better agreement with the experimental data with population balance than constant bubble diameter predictions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071393e

Computational fluid dynamics simulation and experimental investigation / Mayur J. Sathe in Industrial & engineering chemistry research, Vol. 49 N° 1 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 14–28 Titre : Computational fluid dynamics simulation and experimental investigation : study of two-phase liquid−liquid flow in a vertical taylor−couette contactor Type de document : texte imprimé Auteurs : Mayur J. Sathe, Auteur ; Sandesh S. Deshmukh, Auteur ; Jyeshtharaj B. Joshi, Auteur Année de publication : 2010 Article en page(s) : pp. 14–28 Langues : Anglais (eng) Mots-clés : study--two-phase--liquid−liquid--flow--vertical--taylor−couette--contactor ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900185z [article] Computational fluid dynamics simulation and experimental investigation : study of two-phase liquid−liquid flow in a vertical taylor−couette contactor [texte imprimé] / Mayur J. Sathe, Auteur ; Sandesh S. Deshmukh, Auteur ; Jyeshtharaj B. Joshi, Auteur . - 2010 . - pp. 14–28. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 14–28 Mots-clés : study--two-phase--liquid−liquid--flow--vertical--taylor−couette--contactor ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900185z

Development of unified correlations for volumetric mass-transfer coefficient and effective interfacial area in bubble column reactors for various gas-liquid systems using support vector regression / Ankit B. Gandhi in Industrial & engineering chemistry research, Vol. 48 N° 9 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4216–4236 Titre : Development of unified correlations for volumetric mass-transfer coefficient and effective interfacial area in bubble column reactors for various gas-liquid systems using support vector regression Type de document : texte imprimé Auteurs : Ankit B. Gandhi, Auteur ; Prashant P. Gupta, Auteur ; Jyeshtharaj B. Joshi, Auteur Année de publication : 2009 Article en page(s) : pp. 4216–4236 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Volumetric  mass-transfer  coefficient  Unified  correlation  Bubble  columns  Gas−liquid  systems Résumé : The objective of this study was to develop a unified correlation for the volumetric mass-transfer coefficient (kLa) and effective interfacial area (a) in bubble columns for various gas−liquid systems using support vector regression (SVR-) based modeling technique. From the data published in the open literature, 1600 data points from 27 open sources spanning the years 1965−2007 for kLa and 1330 data points from 28 open sources spanning the years 1968−2007 for a were collected. Generalized SVR-based models were developed for the relationship between kLa (and a) and each design and operating parameters such as column and sparger geometry, gas−liquid physical properties, operating temperature, pressure, superficial gas velocity, and so on. Further, these models for kLa and a are available online at http://www.esnips.com/web/UICT-NCL. The proposed generalized SVR-based correlations for kLa and a have prediction accuracies of 99.08% and 98.6% and average absolute relative errors (AAREs) of 7.12% and 5.01%, respectively. Also, the SVR-based correlation provided much improved predictions compared to those obtained using empirical correlations from the literature. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8003489 [article] Development of unified correlations for volumetric mass-transfer coefficient and effective interfacial area in bubble column reactors for various gas-liquid systems using support vector regression [texte imprimé] / Ankit B. Gandhi, Auteur ; Prashant P. Gupta, Auteur ; Jyeshtharaj B. Joshi, Auteur . - 2009 . - pp. 4216–4236. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4216–4236 Mots-clés : Volumetric  mass-transfer  coefficient  Unified  correlation  Bubble  columns  Gas−liquid  systems Résumé : The objective of this study was to develop a unified correlation for the volumetric mass-transfer coefficient (kLa) and effective interfacial area (a) in bubble columns for various gas−liquid systems using support vector regression (SVR-) based modeling technique. From the data published in the open literature, 1600 data points from 27 open sources spanning the years 1965−2007 for kLa and 1330 data points from 28 open sources spanning the years 1968−2007 for a were collected. Generalized SVR-based models were developed for the relationship between kLa (and a) and each design and operating parameters such as column and sparger geometry, gas−liquid physical properties, operating temperature, pressure, superficial gas velocity, and so on. Further, these models for kLa and a are available online at http://www.esnips.com/web/UICT-NCL. The proposed generalized SVR-based correlations for kLa and a have prediction accuracies of 99.08% and 98.6% and average absolute relative errors (AAREs) of 7.12% and 5.01%, respectively. Also, the SVR-based correlation provided much improved predictions compared to those obtained using empirical correlations from the literature. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8003489

Dynamics of flow structures and transport phenomena, 1. experimental and numerical techniques for identification and energy content of flow structures / Jyeshtharaj B. Joshi in Industrial & engineering chemistry research, Vol. 48 N° 17 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 8244–8284 Titre : Dynamics of flow structures and transport phenomena, 1. experimental and numerical techniques for identification and energy content of flow structures Type de document : texte imprimé Auteurs : Jyeshtharaj B. Joshi, Auteur ; Mandar V. Tabib, Auteur ; Sagar S. Deshpande, Auteur Année de publication : 2009 Article en page(s) : pp. 8244–8284 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Flow  structures  Experimental  fluid  dynamics  techniques  Computational  fluid  dynamics  techniques Résumé : Most chemical engineering equipment is operated in the turbulent regime. The flow patterns in this equipment are complex and are characterized by flow structures of wide range of length and time scales. The accurate quantification of these flow structures is very difficult and, hence, the present design practices are still empirical. Abundant literature is available on understanding of these flow structures, but in very few cases efforts have been made to improve the design procedures with this knowledge. There have been several approaches in the literature to identify and characterize the flow structures qualitatively as well as quantitatively. In the last few decades, several numerical as well as experimental methods have been developed that are complementary to each other with the onset of better computational and experimental facilities. In the present work, the methodologies and applications of various experimental fluid dynamics (EFD) techniques (namely, point measurement techniques such as hot film anemometry, laser Doppler velocimetry, and planar measurement techniques such as particle image velocimetry (PIV), high speed photography, Schlieren shadowgraphy, and the recent volume measurement techniques such as holographic PIV, stereo PIV, etc.), and the computational fluid dynamics (CFD) techniques (such as direct numerical simulation (DNS) and large eddy simulation (LES)) have been discussed. Their chronological developments, relative merits, and demerits have been presented to enable readers to make a judgment as to which experimental/numerical technique to adopt. Also, several notable mathematical quantifiers are reviewed (such as quadrant technique, variable integral time average technique, spectral analysis, proper orthogonal decomposition, discrete and continuous wavelet transform, eddy isolation methodology, hybrid POD−Wavelet technique, etc.). All three of these tools (computational, experimental, and mathematical) have evolved over the past 6−7 decades and have shed light on the physics behind the formation and dynamics of various flow structures. The work ends with addressing the present issues, the existing knowledge gaps, and the path forward in this field. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8012506 [article] Dynamics of flow structures and transport phenomena, 1. experimental and numerical techniques for identification and energy content of flow structures [texte imprimé] / Jyeshtharaj B. Joshi, Auteur ; Mandar V. Tabib, Auteur ; Sagar S. Deshpande, Auteur . - 2009 . - pp. 8244–8284. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 8244–8284 Mots-clés : Flow  structures  Experimental  fluid  dynamics  techniques  Computational  fluid  dynamics  techniques Résumé : Most chemical engineering equipment is operated in the turbulent regime. The flow patterns in this equipment are complex and are characterized by flow structures of wide range of length and time scales. The accurate quantification of these flow structures is very difficult and, hence, the present design practices are still empirical. Abundant literature is available on understanding of these flow structures, but in very few cases efforts have been made to improve the design procedures with this knowledge. There have been several approaches in the literature to identify and characterize the flow structures qualitatively as well as quantitatively. In the last few decades, several numerical as well as experimental methods have been developed that are complementary to each other with the onset of better computational and experimental facilities. In the present work, the methodologies and applications of various experimental fluid dynamics (EFD) techniques (namely, point measurement techniques such as hot film anemometry, laser Doppler velocimetry, and planar measurement techniques such as particle image velocimetry (PIV), high speed photography, Schlieren shadowgraphy, and the recent volume measurement techniques such as holographic PIV, stereo PIV, etc.), and the computational fluid dynamics (CFD) techniques (such as direct numerical simulation (DNS) and large eddy simulation (LES)) have been discussed. Their chronological developments, relative merits, and demerits have been presented to enable readers to make a judgment as to which experimental/numerical technique to adopt. Also, several notable mathematical quantifiers are reviewed (such as quadrant technique, variable integral time average technique, spectral analysis, proper orthogonal decomposition, discrete and continuous wavelet transform, eddy isolation methodology, hybrid POD−Wavelet technique, etc.). All three of these tools (computational, experimental, and mathematical) have evolved over the past 6−7 decades and have shed light on the physics behind the formation and dynamics of various flow structures. The work ends with addressing the present issues, the existing knowledge gaps, and the path forward in this field. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8012506

Evaluation of local turbulent energy dissipation rate using PIV in jet loop reactor / Sagar S. Deshpande in Industrial & engineering chemistry research, Vol. 48 N° 10 (Mai 2009) 

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Flow Visualization andThree-Dimensional CFD Simulation of the Annular Region of an Annular Centrifugal Extractor / Sandesh S. Deshmukh in Industrial & engineering chemistry research, Vol. 47 N°10 (Mai 2008) 

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Petroleum residue upgradation via visbreaking / Jyeshtharaj B. Joshi in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

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Residence time distribution and flow patterns in the single-phase annular region of annular centrifugal extractor / Sandesh S. Deshmukh in Industrial & engineering chemistry research, Vol. 48 N°1 (Janvier 2009) 

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Solid−liquid circulating multistage fluidized bed / Prakash V Chavan in Industrial & engineering chemistry research, Vol. 48 N° 9 (Mai 2009) 

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Visbreaking studies in the presence of soaker internals / Rohit P. Kulkarni in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010) 

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