Documents disponibles écrits par cet auteur

Effect of feed spacer mesh length ratio on unsteady hydrodynamics in 2D spiral wound membrane (SWM) channel / K. K. Lau in Industrial & engineering chemistry research, Vol. 49 N° 12 (Juin 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5834–5845 Titre : Effect of feed spacer mesh length ratio on unsteady hydrodynamics in 2D spiral wound membrane (SWM) channel Type de document : texte imprimé Auteurs : K. K. Lau, Auteur ; M. Z. Abu Bakar, Auteur ; A. L. Ahmad, Auteur Année de publication : 2010 Article en page(s) : pp. 5834–5845 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ladder-type  spacer  mesh  length  ratio  Spiral  wound  membranes  Computational  fluid  dynamics  approach Résumé : The present work involves the simulation and optimization of the ladder-type spacer mesh length (ML) ratio in spiral wound membranes (SWMs), using a two-dimensional (2D) integrated computational fluid dynamics (CFD) approach. The permeation properties, incorporated with a transient unsteady hydrodynamics modeling approach, were used to analyze and optimize the ML value for SWM feed spacers. The influence of unsteady hydrodynamics on the development of the concentration polarization in the membrane channel was also investigated. The optimum ML ratio was determined to be 3, because of its ability to generate a high intensity of unsteady hydrodynamics with the lowest effective concentration polarization factor and the results were further validated using velocity vector plots, wall shear stress analysis, and the localized concentration polarization factor. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9017989 [article] Effect of feed spacer mesh length ratio on unsteady hydrodynamics in 2D spiral wound membrane (SWM) channel [texte imprimé] / K. K. Lau, Auteur ; M. Z. Abu Bakar, Auteur ; A. L. Ahmad, Auteur . - 2010 . - pp. 5834–5845. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5834–5845 Mots-clés : Ladder-type  spacer  mesh  length  ratio  Spiral  wound  membranes  Computational  fluid  dynamics  approach Résumé : The present work involves the simulation and optimization of the ladder-type spacer mesh length (ML) ratio in spiral wound membranes (SWMs), using a two-dimensional (2D) integrated computational fluid dynamics (CFD) approach. The permeation properties, incorporated with a transient unsteady hydrodynamics modeling approach, were used to analyze and optimize the ML value for SWM feed spacers. The influence of unsteady hydrodynamics on the development of the concentration polarization in the membrane channel was also investigated. The optimum ML ratio was determined to be 3, because of its ability to generate a high intensity of unsteady hydrodynamics with the lowest effective concentration polarization factor and the results were further validated using velocity vector plots, wall shear stress analysis, and the localized concentration polarization factor. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9017989

Morphological and thermal-mechanical stretching properties on polymeric lateral flow nitrocellulose membrane / A. L. Ahmad in Industrial & engineering chemistry research, Vol. 48 N° 7 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp.3417–3424 Titre : Morphological and thermal-mechanical stretching properties on polymeric lateral flow nitrocellulose membrane Type de document : texte imprimé Auteurs : A. L. Ahmad, Auteur ; S. C. Low, Auteur ; S. R. Abd. Shukor, Auteur Année de publication : 2009 Article en page(s) : pp.3417–3424 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Flow  nitrocellulose  membrane  Thermal-mechanical  stretching  technique  Polymer Résumé : Lateral flow nitrocellulose (NC) membrane is well-known as the transport medium in a diagnostic test strip. The function of the membrane is greatly influenced by its physical morphology and chemical composition. Hence, a thermal-mechanical stretching technique was introduced to modify polymeric membrane morphologies for various performance studies. Membrane samples were stretched at the appropriate settings of stretching elongation, stretching speed, and stretching temperature. Experimental, AFM, and SEM results show that membrane morphologies changed significantly as a result of the stretching effects. The current study has demonstrated that physical thermal-mechanical stretching properties are important in modifying membrane morphologies for specific applications, since these parameters potentially affect the membrane’s final performances. These findings provided some insight on the relationship between stretched membranes’ morphology and performances. This knowledge is useful in producing both versatile and durable nitrocellulose membranes for lateral flow applications. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801282t [article] Morphological and thermal-mechanical stretching properties on polymeric lateral flow nitrocellulose membrane [texte imprimé] / A. L. Ahmad, Auteur ; S. C. Low, Auteur ; S. R. Abd. Shukor, Auteur . - 2009 . - pp.3417–3424. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp.3417–3424 Mots-clés : Flow  nitrocellulose  membrane  Thermal-mechanical  stretching  technique  Polymer Résumé : Lateral flow nitrocellulose (NC) membrane is well-known as the transport medium in a diagnostic test strip. The function of the membrane is greatly influenced by its physical morphology and chemical composition. Hence, a thermal-mechanical stretching technique was introduced to modify polymeric membrane morphologies for various performance studies. Membrane samples were stretched at the appropriate settings of stretching elongation, stretching speed, and stretching temperature. Experimental, AFM, and SEM results show that membrane morphologies changed significantly as a result of the stretching effects. The current study has demonstrated that physical thermal-mechanical stretching properties are important in modifying membrane morphologies for specific applications, since these parameters potentially affect the membrane’s final performances. These findings provided some insight on the relationship between stretched membranes’ morphology and performances. This knowledge is useful in producing both versatile and durable nitrocellulose membranes for lateral flow applications. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801282t