Documents disponibles écrits par cet auteur

Effect of second order velocity-slip/temperature-jump on basic gaseous fluctuating micro flows / M. A. Hamdan in Transactions of the ASME . Journal of fluids engineering, Vol. 132 N° 7 (Juillet 2010) 

Public ISBD [article]  in Transactions of the ASME . Journal of fluids engineering > Vol. 132 N° 7 (Juillet 2010) . - 06 p. Titre : Effect of second order velocity-slip/temperature-jump on basic gaseous fluctuating micro flows Type de document : texte imprimé Auteurs : M. A. Hamdan, Auteur ; M. A. Al-Nimr, Auteur ; Vladimir A. Hammoudeh, Auteur Année de publication : 2010 Article en page(s) : 06 p. Note générale : fluids engineering Langues : Anglais (eng) Mots-clés : force;  flow  (dynamics);  temperature;  natural  convection;  boundary-value  problems;  frequency;  pressure  gradient Résumé : In this work, the effect of the second-order term to the velocity-slip/temperature-jump boundary conditions on the solution of four cases in which the driving force is fluctuating harmonically was studied. The study aims to establish criteria that secure the use of the first order velocity-slip/temperature-jump model boundary conditions instead of the second-order ones. The four cases studied were the transient Couette flow, the pulsating Poiseuille flow, Stoke’s second problem, and the transient natural convection flow. It was found that at any given Kn number, increasing the driving force frequency, increases the difference between the first and second-order models. Assuming that a difference between the two models of over 5% is significant enough to justify the use of the more complex second-order model, the critical frequencies for the four different cases were found. For the cases for which the flow is induced by the fluctuating wall as in cases 1 and 3, we found that critical frequency at Kn=0.1 to be ω=8. For the cases of flow driven by a fluctuating pressure gradient as in case 2, this frequency was found to be ω=1, at the same Kn number. In case 4, for the temperature-jump model, the critical frequency was found to be ω=7 and for the velocity-slip model the critical frequency at the same Kn number was found to be ω=1.35. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/Issue.aspx?issueID=27423 [...] [article] Effect of second order velocity-slip/temperature-jump on basic gaseous fluctuating micro flows [texte imprimé] / M. A. Hamdan, Auteur ; M. A. Al-Nimr, Auteur ; Vladimir A. Hammoudeh, Auteur . - 2010 . - 06 p. fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 132 N° 7 (Juillet 2010) . - 06 p. Mots-clés : force;  flow  (dynamics);  temperature;  natural  convection;  boundary-value  problems;  frequency;  pressure  gradient Résumé : In this work, the effect of the second-order term to the velocity-slip/temperature-jump boundary conditions on the solution of four cases in which the driving force is fluctuating harmonically was studied. The study aims to establish criteria that secure the use of the first order velocity-slip/temperature-jump model boundary conditions instead of the second-order ones. The four cases studied were the transient Couette flow, the pulsating Poiseuille flow, Stoke’s second problem, and the transient natural convection flow. It was found that at any given Kn number, increasing the driving force frequency, increases the difference between the first and second-order models. Assuming that a difference between the two models of over 5% is significant enough to justify the use of the more complex second-order model, the critical frequencies for the four different cases were found. For the cases for which the flow is induced by the fluctuating wall as in cases 1 and 3, we found that critical frequency at Kn=0.1 to be ω=8. For the cases of flow driven by a fluctuating pressure gradient as in case 2, this frequency was found to be ω=1, at the same Kn number. In case 4, for the temperature-jump model, the critical frequency was found to be ω=7 and for the velocity-slip model the critical frequency at the same Kn number was found to be ω=1.35. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/Issue.aspx?issueID=27423 [...]

Investigation into the similarity solution for boundary layer flows in microsystems / Suhil Kiwan in Journal of heat transfer, Vol. 132 N° 4 (n° spécial) (Avril 2010) 

Public ISBD [article]  in Journal of heat transfer > Vol. 132 N° 4 (n° spécial) (Avril 2010) . - pp. [041011-1/9] Titre : Investigation into the similarity solution for boundary layer flows in microsystems Type de document : texte imprimé Auteurs : Suhil Kiwan, Auteur ; M. A. Al-Nimr, Auteur Article en page(s) : pp. [041011-1/9] Note générale : Physique Langues : Anglais (eng) Mots-clés : Similarity  solution  Stagnation  surface  Rarafied  gaz  Velocity  slip  parameter  Temperature  jump  parameter Index. décimale : 536 Chaleur. Thermodynamique Résumé : An investigation toward the existence of a complete similarity solution for boundary layer flows under the velocity slip and temperature jump conditions is carried out. The study is limited to the boundary layer flows resulting from an arbitrary freestream velocity U(x)=Uoxm and wall temperature given by Tw−T[infinity]=Cxn. It is found that a similar solution exists only for m=1 and n=0, which represents stagnation flow on isothermal surface. This case has been thoroughly investigated. The analysis showed that three parameters control the flow and heat transfer characteristics of the problem. These parameters are the velocity slip parameter K1, the temperature jump parameter K2, and Prandtl number. The effect of these parameters on the flow and heat transfer of the problem has been studied and presented. It is found that the slip velocity parameter affects both the flow and heat transfer characteristics of the problem. It is found that the skin friction coefficient decreases with increasing K1 and most of changes in the skin friction takes place in the range 0x-0.5(K1+1.279)−0.8 for 011.06)/(0.515+K11.06)](K2+1.489Pr−0.44)−1, for 0 DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Investigation into the similarity solution for boundary layer flows in microsystems [texte imprimé] / Suhil Kiwan, Auteur ; M. A. Al-Nimr, Auteur . - pp. [041011-1/9]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 4 (n° spécial) (Avril 2010) . - pp. [041011-1/9] Mots-clés : Similarity  solution  Stagnation  surface  Rarafied  gaz  Velocity  slip  parameter  Temperature  jump  parameter Index. décimale : 536 Chaleur. Thermodynamique Résumé : An investigation toward the existence of a complete similarity solution for boundary layer flows under the velocity slip and temperature jump conditions is carried out. The study is limited to the boundary layer flows resulting from an arbitrary freestream velocity U(x)=Uoxm and wall temperature given by Tw−T[infinity]=Cxn. It is found that a similar solution exists only for m=1 and n=0, which represents stagnation flow on isothermal surface. This case has been thoroughly investigated. The analysis showed that three parameters control the flow and heat transfer characteristics of the problem. These parameters are the velocity slip parameter K1, the temperature jump parameter K2, and Prandtl number. The effect of these parameters on the flow and heat transfer of the problem has been studied and presented. It is found that the slip velocity parameter affects both the flow and heat transfer characteristics of the problem. It is found that the skin friction coefficient decreases with increasing K1 and most of changes in the skin friction takes place in the range 0x-0.5(K1+1.279)−0.8 for 011.06)/(0.515+K11.06)](K2+1.489Pr−0.44)−1, for 0 DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]