A numerical study of the natural convection flow arising from a confined thermal source is presented. The physical system considered is a 2D cavity of square cross-section, containing a horizontal cylindrical source, the heat carrier fluid being air at Prandtl number Pr = .7. The heating body is placed in central position; the resulting flow is investigated with respect to the variation of the Rayleigh number and the ratio between the source diameter and the cavity side length. Either Dirichlet and Neumann thermal boundary conditions are imposed on the cylinder surface. The analyses make use of two Navier-Stokes, finite- volume codes: a general-purpose CFD package, and a Direct Numerical Simulation software. Main issues of the work are the rise of steady and transitional flows and the heat transfer performance of the system, as influenced by the different boundary conditions at the heat source wall. A correlating equation for the average Nusselt number on the cylinder, previously obtained for the isothermal case, is validated for the uniform heat flux condition.

Numerical Analysis of Natural Convection Flow and Heat Transfer from an Enclosed Cylindrical Heat Source / Angeli, Diego; P., Levoni; E., Caffagni; Barozzi, Giovanni Sebastiano. - STAMPA. - (2006), pp. 455-460. ((Intervento presentato al convegno 24° Congresso Nazionale U.I.T.sulla Trasmissione del Calore tenutosi a Napoli nel 21-23 Giugno 2006.

Numerical Analysis of Natural Convection Flow and Heat Transfer from an Enclosed Cylindrical Heat Source

ANGELI, Diego;BAROZZI, Giovanni Sebastiano
2006

Abstract

A numerical study of the natural convection flow arising from a confined thermal source is presented. The physical system considered is a 2D cavity of square cross-section, containing a horizontal cylindrical source, the heat carrier fluid being air at Prandtl number Pr = .7. The heating body is placed in central position; the resulting flow is investigated with respect to the variation of the Rayleigh number and the ratio between the source diameter and the cavity side length. Either Dirichlet and Neumann thermal boundary conditions are imposed on the cylinder surface. The analyses make use of two Navier-Stokes, finite- volume codes: a general-purpose CFD package, and a Direct Numerical Simulation software. Main issues of the work are the rise of steady and transitional flows and the heat transfer performance of the system, as influenced by the different boundary conditions at the heat source wall. A correlating equation for the average Nusselt number on the cylinder, previously obtained for the isothermal case, is validated for the uniform heat flux condition.
24° Congresso Nazionale U.I.T.sulla Trasmissione del Calore
Napoli
21-23 Giugno 2006
455
460
Angeli, Diego; P., Levoni; E., Caffagni; Barozzi, Giovanni Sebastiano
Numerical Analysis of Natural Convection Flow and Heat Transfer from an Enclosed Cylindrical Heat Source / Angeli, Diego; P., Levoni; E., Caffagni; Barozzi, Giovanni Sebastiano. - STAMPA. - (2006), pp. 455-460. ((Intervento presentato al convegno 24° Congresso Nazionale U.I.T.sulla Trasmissione del Calore tenutosi a Napoli nel 21-23 Giugno 2006.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/464231
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact