Documents disponibles écrits par cet auteur

A consolidated model for the turbine operation of centrifugal pumps / Punit Singh in Transactions of the ASME . Journal of engineering for gas turbines and power, Vol. 133 N° 6 (Juin 2011) 

Public ISBD [article]  in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 6 (Juin 2011) . - 09 p. Titre : A consolidated model for the turbine operation of centrifugal pumps Type de document : texte imprimé Auteurs : Punit Singh, Auteur ; Franz Nestmann, Auteur Année de publication : 2011 Article en page(s) : 09 p. Note générale : Turbines à gaz Langues : Anglais (eng) Mots-clés : Pump  as  turbine  Prediction  Selection  Evaluation  Cordier  line  Uncertainty  analysis  Acceptance  criterion  Optimization Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : A consolidated model for the turbine operation of centrifugal pumps comprising accurate prediction, optimum selection, and rigorous evaluation has been the primary need and the most challenging tasks for the industry to deal with. This paper introduces a consolidated model that is developed from experimental results of different pump shapes (20–80 rpm) and turbomachine fundamentals directly resulting in the parsimony feature of the model. The model also creates a new basis for dealing with uncertainties. The prediction model segment of the consolidated model requires only the pump shape and size as input parameters for bringing out the complete turbine characteristics. The selection model segment, on the other hand, requires the site head and flow as fixed input parameters and turbine speed as the control parameter to prescribe suitable pumps available in the market. The evaluation model segment compares the absolute turbine characteristics of the suitable pumps and recommends the most suitable pump for the given site. The model also includes an acceptance criterion that relates the deviation of the “pump as turbine” operating parameters with the site parameters, and it is very useful at the evaluation stage. The features of the consolidated model are illustrated with two case studies, which highlight the importance of evaluation in addition to the prediction and basic selection of pumps operating as turbines. In order to increase the accuracy and robustness of the model, the paper recommends an optimization routine stage on the existing model that comprises results of more pump shapes (obtained through field projects or extended laboratory work). The optimization procedure suggested would come a long way to provide a lasting solution for the search of a reliable pump as turbine model. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013300 [...] [article] A consolidated model for the turbine operation of centrifugal pumps [texte imprimé] / Punit Singh, Auteur ; Franz Nestmann, Auteur . - 2011 . - 09 p. Turbines à gaz Langues : Anglais (eng) in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 6 (Juin 2011) . - 09 p. Mots-clés : Pump  as  turbine  Prediction  Selection  Evaluation  Cordier  line  Uncertainty  analysis  Acceptance  criterion  Optimization Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : A consolidated model for the turbine operation of centrifugal pumps comprising accurate prediction, optimum selection, and rigorous evaluation has been the primary need and the most challenging tasks for the industry to deal with. This paper introduces a consolidated model that is developed from experimental results of different pump shapes (20–80 rpm) and turbomachine fundamentals directly resulting in the parsimony feature of the model. The model also creates a new basis for dealing with uncertainties. The prediction model segment of the consolidated model requires only the pump shape and size as input parameters for bringing out the complete turbine characteristics. The selection model segment, on the other hand, requires the site head and flow as fixed input parameters and turbine speed as the control parameter to prescribe suitable pumps available in the market. The evaluation model segment compares the absolute turbine characteristics of the suitable pumps and recommends the most suitable pump for the given site. The model also includes an acceptance criterion that relates the deviation of the “pump as turbine” operating parameters with the site parameters, and it is very useful at the evaluation stage. The features of the consolidated model are illustrated with two case studies, which highlight the importance of evaluation in addition to the prediction and basic selection of pumps operating as turbines. In order to increase the accuracy and robustness of the model, the paper recommends an optimization routine stage on the existing model that comprises results of more pump shapes (obtained through field projects or extended laboratory work). The optimization procedure suggested would come a long way to provide a lasting solution for the search of a reliable pump as turbine model. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013300 [...]

Settling behavior of fine-grained materials in flocs / Jong-Woo Kim in Journal of hydraulic research, Vol. 47 N° 4 (2009) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 47 N° 4 (2009) . - pp. 492-502 Titre : Settling behavior of fine-grained materials in flocs Titre original : Comportement de la décantation des matériaux fins en floculation Type de document : texte imprimé Auteurs : Jong-Woo Kim, Auteur ; Franz Nestmann, Auteur Article en page(s) : pp. 492-502 Note générale : Hydraulique Résumé en Français Langues : Anglais (eng) Mots-clés : Concentration  Deposition  Flocculation  Settling  velocity  Suspended  particles Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : This paper contributes to the understanding of the effect of suspended sediment deposition and turbidity on aquatic systems. The influence of the cohesive properties of clay on its settling behaviour was quantified in still distilled water with ion addition. Two different model materials, alumina and quartz, were used, as their identical presentation in the mineral composition of clay affects the flocculation of suspended fine particles. The suspended concentrations were measured in a 1 m settling column using a CCD Camera. The settling rates of alumina and quartz increased with salinity, with the settling rates for alumina being higher than those for quartz at any given salinity. The settling velocities for alumina were higher at pH 9, whereas the opposite was true for quartz. Conversely, the settling velocities for quartz were higher at pH 4, while the velocities for alumina were then low. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com [article] Settling behavior of fine-grained materials in flocs = Comportement de la décantation des matériaux fins en floculation [texte imprimé] / Jong-Woo Kim, Auteur ; Franz Nestmann, Auteur . - pp. 492-502. Hydraulique Résumé en Français Langues : Anglais (eng) in Journal of hydraulic research > Vol. 47 N° 4 (2009) . - pp. 492-502 Mots-clés : Concentration  Deposition  Flocculation  Settling  velocity  Suspended  particles Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : This paper contributes to the understanding of the effect of suspended sediment deposition and turbidity on aquatic systems. The influence of the cohesive properties of clay on its settling behaviour was quantified in still distilled water with ion addition. Two different model materials, alumina and quartz, were used, as their identical presentation in the mineral composition of clay affects the flocculation of suspended fine particles. The suspended concentrations were measured in a 1 m settling column using a CCD Camera. The settling rates of alumina and quartz increased with salinity, with the settling rates for alumina being higher than those for quartz at any given salinity. The settling velocities for alumina were higher at pH 9, whereas the opposite was true for quartz. Conversely, the settling velocities for quartz were higher at pH 4, while the velocities for alumina were then low. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com