Documents disponibles écrits par cet auteur

An object-oriented approach for structure design of property calculation programs using equations of state / Lijuan Shi in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6404–6412 Titre : An object-oriented approach for structure design of property calculation programs using equations of state Type de document : texte imprimé Auteurs : Lijuan Shi, Auteur ; Xiaodong Liang, Auteur Année de publication : 2011 Article en page(s) : pp. 6404–6412 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Equations  of  state  calculation  programs Résumé : A new object-oriented approach for designing general property calculation programs using different types of equations of state (EoS) is presented in this work. It helps to ease the programs’ extensibility, reusability, and maintainability and, at the same time, minimize the code redundancy. The approach consists of two parts: (a) the total Helmholtz free energy function is separated into specific terms, based on physical meanings or mathematical expressions, independent of the properties of interest, and the same or similar specific terms used in different equations of state are abstracted to general algorithms; (b) the general relationships between these algorithms and the properties of interest are implemented at the highest level of the program. According to this strategy, a general cubic algorithm can be abstracted for all of the cubic EoS. The general hard-sphere, hard-chain, and association algorithms can be aggregated into different Statistical Associating Fluid Theory (SAFT) family EoS with different dispersion algorithms. Similarly, the general cubic and association algorithms can be aggregated into Cubic Plus Association (CPA) EoS. Taking Perturbed-Chain SAFT (PC-SAFT) EoS as an example, this manuscript demonstrates a clear object-oriented structure for developers, with regard to how to design a complete thermodynamic model package using this approach. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101547t [article] An object-oriented approach for structure design of property calculation programs using equations of state [texte imprimé] / Lijuan Shi, Auteur ; Xiaodong Liang, Auteur . - 2011 . - pp. 6404–6412. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6404–6412 Mots-clés : Equations  of  state  calculation  programs Résumé : A new object-oriented approach for designing general property calculation programs using different types of equations of state (EoS) is presented in this work. It helps to ease the programs’ extensibility, reusability, and maintainability and, at the same time, minimize the code redundancy. The approach consists of two parts: (a) the total Helmholtz free energy function is separated into specific terms, based on physical meanings or mathematical expressions, independent of the properties of interest, and the same or similar specific terms used in different equations of state are abstracted to general algorithms; (b) the general relationships between these algorithms and the properties of interest are implemented at the highest level of the program. According to this strategy, a general cubic algorithm can be abstracted for all of the cubic EoS. The general hard-sphere, hard-chain, and association algorithms can be aggregated into different Statistical Associating Fluid Theory (SAFT) family EoS with different dispersion algorithms. Similarly, the general cubic and association algorithms can be aggregated into Cubic Plus Association (CPA) EoS. Taking Perturbed-Chain SAFT (PC-SAFT) EoS as an example, this manuscript demonstrates a clear object-oriented structure for developers, with regard to how to design a complete thermodynamic model package using this approach. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101547t

Application of the finite-element method for the determination of the parameters representing the cross-magnetizing in saturated synchronous machines / Xiaodong Liang in IEEE transactions on energy conversion, Vol. 25 N° 1 (Mars 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25 N° 1 (Mars 2010) . - pp. 70 - 79 Titre : Application of the finite-element method for the determination of the parameters representing the cross-magnetizing in saturated synchronous machines Type de document : texte imprimé Auteurs : Xiaodong Liang, Auteur ; El-Serafi, A.M., Auteur ; S. O. Faried, Auteur Année de publication : 2010 Article en page(s) : pp. 70 - 79 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : electromagnetic  fields;  finite  element  analysis;  synchronous  machines Résumé : It has been recognized that the cross-magnetizing phenomenon of saturated synchronous machines plays an important role in their analysis using the two-axis frame models. In this paper, the finite-element method (FEM) is applied to determine from 2-D static electromagnetic field solutions the parameters representing this phenomenon. A specially designed synchronous machine that can be excited from both its direct and quadrature axes is used in this study in order that the parameters representing the cross-magnetizing effect could be measured experimentally and, thus, the accuracy of the numerical solution can be verified. The effects of some of the factors that may affect the accuracy of the FEM analysis have also been investigated. The results of these studies have shown that the calculated parameters representing the cross-magnetizing phenomenon using the FEM are consistent with the measured values. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5345872&sortType%3Das [...] [article] Application of the finite-element method for the determination of the parameters representing the cross-magnetizing in saturated synchronous machines [texte imprimé] / Xiaodong Liang, Auteur ; El-Serafi, A.M., Auteur ; S. O. Faried, Auteur . - 2010 . - pp. 70 - 79. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25 N° 1 (Mars 2010) . - pp. 70 - 79 Mots-clés : electromagnetic  fields;  finite  element  analysis;  synchronous  machines Résumé : It has been recognized that the cross-magnetizing phenomenon of saturated synchronous machines plays an important role in their analysis using the two-axis frame models. In this paper, the finite-element method (FEM) is applied to determine from 2-D static electromagnetic field solutions the parameters representing this phenomenon. A specially designed synchronous machine that can be excited from both its direct and quadrature axes is used in this study in order that the parameters representing the cross-magnetizing effect could be measured experimentally and, thus, the accuracy of the numerical solution can be verified. The effects of some of the factors that may affect the accuracy of the FEM analysis have also been investigated. The results of these studies have shown that the calculated parameters representing the cross-magnetizing phenomenon using the FEM are consistent with the measured values. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5345872&sortType%3Das [...]

Approach to Improve Speed of Sound Calculation within PC-SAFT Framework / Xiaodong Liang in Industrial & engineering chemistry research, Vol. 51 N° 45 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp. 14903–14914 Titre : Approach to Improve Speed of Sound Calculation within PC-SAFT Framework Type de document : texte imprimé Auteurs : Xiaodong Liang, Auteur ; Bjorn Maribo-Mogensen, Auteur ; Kaj Thomsen, Auteur Année de publication : 2013 Article en page(s) : pp. 14903–14914 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Speed  sound  data  parameter  estimation Résumé : An extensive comparison of SRK, CPA, and PC-SAFT for the speed of sound in normal alkanes has been performed. The results reveal that PC-SAFT captures the curvature of the speed of sound better than cubic EoS, but the accuracy is not satisfactory. Two approaches have been proposed to improve PC-SAFT’s accuracy for speed of sound: (i) putting speed of sound data into parameter estimation; (ii) putting speed of sound data into both universal constants regression and parameter estimation. The results have shown that the second approach can significantly improve the speed of sound (3.2%) prediction while keeping acceptable accuracy for the primary properties, i.e. vapor pressure (2.1%) and liquid density (1.5%). The two approaches have also been applied to methanol, and both give very good results. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3018127 [article] Approach to Improve Speed of Sound Calculation within PC-SAFT Framework [texte imprimé] / Xiaodong Liang, Auteur ; Bjorn Maribo-Mogensen, Auteur ; Kaj Thomsen, Auteur . - 2013 . - pp. 14903–14914. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp. 14903–14914 Mots-clés : Speed  sound  data  parameter  estimation Résumé : An extensive comparison of SRK, CPA, and PC-SAFT for the speed of sound in normal alkanes has been performed. The results reveal that PC-SAFT captures the curvature of the speed of sound better than cubic EoS, but the accuracy is not satisfactory. Two approaches have been proposed to improve PC-SAFT’s accuracy for speed of sound: (i) putting speed of sound data into parameter estimation; (ii) putting speed of sound data into both universal constants regression and parameter estimation. The results have shown that the second approach can significantly improve the speed of sound (3.2%) prediction while keeping acceptable accuracy for the primary properties, i.e. vapor pressure (2.1%) and liquid density (1.5%). The two approaches have also been applied to methanol, and both give very good results. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3018127