Documents disponibles écrits par cet auteur

Effects of variable viscosity and thermal conductivity of CuO-water nanofluid on heat transfer enhancement in natural convection / Eiyad Abu-Nada in Journal of heat transfer, Vol. 132 N° 5 (Mai 2010) 

Public ISBD [article]  in Journal of heat transfer > Vol. 132 N° 5 (Mai 2010) . - pp. [052401-1/9] Titre : Effects of variable viscosity and thermal conductivity of CuO-water nanofluid on heat transfer enhancement in natural convection : mathematical model and simulation Type de document : texte imprimé Auteurs : Eiyad Abu-Nada, Auteur Article en page(s) : pp. [052401-1/9] Note générale : Physique Langues : Anglais (eng) Mots-clés : Nanofluid  Viscosity  Thermal  conductivity  Natural  convection  Annulus Index. décimale : 536 Chaleur. Thermodynamique Résumé : Heat transfer enhancement in horizontal annuli using variable thermal conductivity and variable viscosity of CuO-water nanofluid is investigated numerically. The base case of simulation used thermal conductivity and viscosity data that consider temperature property dependence and nanoparticle size. It was observed that for Ra>=104, the average Nusselt number was deteriorated by increasing the volume fraction of nanoparticles. However, for Ra=103, the average Nusselt number enhancement depends on aspect ratio of the annulus as well as volume fraction of nanoparticles. Also, for Ra=103, the average Nusselt number was less sensitive to volume fraction of nanoparticles at high aspect ratio and the average Nusselt number increased by increasing the volume fraction of nanoaprticles for aspect ratios <=0.4. For Ra>=104, the Nusselt number was deteriorated everywhere around the cylinder surface especially at high aspect ratio. However, this reduction is only restricted to certain regions around the cylinder surface for Ra=103. For Ra>=104, the Maxwell–Garnett and the Chon et al. conductivity models demonstrated similar results. But, there was a deviation in the prediction at Ra=103 and this deviation becomes more significant at high volume fraction of nanoparticles. The Nguyen et al. data and the Brinkman model give completely different predictions for Ra>=104, where the difference in prediction of the Nusselt number reached 50%. However, this difference was less than 10% at Ra=103. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&smode=strresults& [...] [article] Effects of variable viscosity and thermal conductivity of CuO-water nanofluid on heat transfer enhancement in natural convection : mathematical model and simulation [texte imprimé] / Eiyad Abu-Nada, Auteur . - pp. [052401-1/9]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 5 (Mai 2010) . - pp. [052401-1/9] Mots-clés : Nanofluid  Viscosity  Thermal  conductivity  Natural  convection  Annulus Index. décimale : 536 Chaleur. Thermodynamique Résumé : Heat transfer enhancement in horizontal annuli using variable thermal conductivity and variable viscosity of CuO-water nanofluid is investigated numerically. The base case of simulation used thermal conductivity and viscosity data that consider temperature property dependence and nanoparticle size. It was observed that for Ra>=104, the average Nusselt number was deteriorated by increasing the volume fraction of nanoparticles. However, for Ra=103, the average Nusselt number enhancement depends on aspect ratio of the annulus as well as volume fraction of nanoparticles. Also, for Ra=103, the average Nusselt number was less sensitive to volume fraction of nanoparticles at high aspect ratio and the average Nusselt number increased by increasing the volume fraction of nanoaprticles for aspect ratios <=0.4. For Ra>=104, the Nusselt number was deteriorated everywhere around the cylinder surface especially at high aspect ratio. However, this reduction is only restricted to certain regions around the cylinder surface for Ra=103. For Ra>=104, the Maxwell–Garnett and the Chon et al. conductivity models demonstrated similar results. But, there was a deviation in the prediction at Ra=103 and this deviation becomes more significant at high volume fraction of nanoparticles. The Nguyen et al. data and the Brinkman model give completely different predictions for Ra>=104, where the difference in prediction of the Nusselt number reached 50%. However, this difference was less than 10% at Ra=103. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&smode=strresults& [...]

Energy conservative dissipative particle dynamics simulation of natural convection in liquids / Eiyad Abu-Nada in Journal of heat transfer, Vol. 133 N° 11 (Novembre 2011) 

Public ISBD [article]  in Journal of heat transfer > Vol. 133 N° 11 (Novembre 2011) . - pp. [112501/1-12] Titre : Energy conservative dissipative particle dynamics simulation of natural convection in liquids Type de document : texte imprimé Auteurs : Eiyad Abu-Nada, Auteur Année de publication : 2012 Article en page(s) : pp. [112501/1-12] Note générale : Physique Langues : Anglais (eng) Mots-clés : Dissipative  particle  dynamics  eDPD  Natural  convection  Rayleigh-Bénard  convection  Prandtl  number Index. décimale : 536 Chaleur. Thermodynamique Résumé : Dissipative particle dynamics with energy conservation (eDPD) was used to study natural convection in liquid domain over a wide range of Rayleigh Numbers. The problem selected for this study was the Rayleigh–Bénard convection problem. The Prandtl number used resembles water where the Prandtl number is set to Pr = 6.57. The eDPD results were compared to the finite volume solutions, and it was found that the eDPD method calculates the temperature and flow fields throughout the natural convection domains correctly. The eDPD model recovered the basic features of natural convection, such as development of plumes, development of thermal boundary layers, and development of natural convection circulation cells (rolls). The eDPD results were presented by means of temperature isotherms, streamlines, velocity contours, velocity vector plots, and temperature and velocity profiles. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000133000011 [...] [article] Energy conservative dissipative particle dynamics simulation of natural convection in liquids [texte imprimé] / Eiyad Abu-Nada, Auteur . - 2012 . - pp. [112501/1-12]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 11 (Novembre 2011) . - pp. [112501/1-12] Mots-clés : Dissipative  particle  dynamics  eDPD  Natural  convection  Rayleigh-Bénard  convection  Prandtl  number Index. décimale : 536 Chaleur. Thermodynamique Résumé : Dissipative particle dynamics with energy conservation (eDPD) was used to study natural convection in liquid domain over a wide range of Rayleigh Numbers. The problem selected for this study was the Rayleigh–Bénard convection problem. The Prandtl number used resembles water where the Prandtl number is set to Pr = 6.57. The eDPD results were compared to the finite volume solutions, and it was found that the eDPD method calculates the temperature and flow fields throughout the natural convection domains correctly. The eDPD model recovered the basic features of natural convection, such as development of plumes, development of thermal boundary layers, and development of natural convection circulation cells (rolls). The eDPD results were presented by means of temperature isotherms, streamlines, velocity contours, velocity vector plots, and temperature and velocity profiles. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000133000011 [...]