Vadasz number influence on vibration in a rotating porous layer placed far away from the axis of rotation / S. Govender in Journal of heat transfer, Vol. 132 N° 11 (Novembre 2010)  

Public ISBD [article]  inJournal of heat transfer > Vol. 132 N° 11 (Novembre 2010) . - pp. [112601-1/5] Titre : Vadasz number influence on vibration in a rotating porous layer placed far away from the axis of rotation Type de document : texte imprimé Auteurs : S. Govender, Auteur Année de publication : 2010 Article en page(s) : pp. [112601-1/5] Note générale : Physique Langues : Anglais (eng) Mots-clés : Gravity modulation Porous media Natural convection Rayleigh number Froude Index. décimale : 536 Chaleur. Thermodynamique Résumé : We consider vibration effects on the classical Rayleigh–Be'nard problem and the classical Vadasz (1994, “Stability of Free Convection in a Narrow Porous Layer Subject to Rotation,” Int. Commun. Heat Mass Transfer, 21, pp. 881–890) problem, which includes rotation of a vertical porous layer about the z-axis. In particular, we focus on the influence of the Vadasz number on vibration for small to moderate and large Vadasz numbers. For small to moderate Vadasz numbers, we develop an analogy between the Vadasz problem (Vadasz, 1994, “Stability of Free Convection in a Narrow Porous Layer Subject to Rotation,” Int. Commun. Heat Mass Transfer, 21, pp. 881–890) placed far away from the axis of rotation and classical Rayleigh–Be'nard problem, both of which include the effects of vibration. It is shown here that the stability criteria are identical to the Rayleigh–Be'nard problem with vibration when g*=omega*2X0*. The analysis for the large Vadasz number scaling indicates that a frozen time approximation is appropriate where the effect of vibration is modeled as small variations in the Rayleigh number definition. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Vadasz number influence on vibration in a rotating porous layer placed far away from the axis of rotation [texte imprimé] / S. Govender, Auteur . - 2010 . - pp. [112601-1/5]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 11 (Novembre 2010) . - pp. [112601-1/5] Mots-clés : Gravity modulation Porous media Natural convection Rayleigh number Froude Index. décimale : 536 Chaleur. Thermodynamique Résumé : We consider vibration effects on the classical Rayleigh–Be'nard problem and the classical Vadasz (1994, “Stability of Free Convection in a Narrow Porous Layer Subject to Rotation,” Int. Commun. Heat Mass Transfer, 21, pp. 881–890) problem, which includes rotation of a vertical porous layer about the z-axis. In particular, we focus on the influence of the Vadasz number on vibration for small to moderate and large Vadasz numbers. For small to moderate Vadasz numbers, we develop an analogy between the Vadasz problem (Vadasz, 1994, “Stability of Free Convection in a Narrow Porous Layer Subject to Rotation,” Int. Commun. Heat Mass Transfer, 21, pp. 881–890) placed far away from the axis of rotation and classical Rayleigh–Be'nard problem, both of which include the effects of vibration. It is shown here that the stability criteria are identical to the Rayleigh–Be'nard problem with vibration when g*=omega*2X0*. The analysis for the large Vadasz number scaling indicates that a frozen time approximation is appropriate where the effect of vibration is modeled as small variations in the Rayleigh number definition. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]

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