Transient Thermal Analysis of Natural Convection in Porous and Partially Porous Cavities

Arpino, Fausto; Cortellessa, G.; Mauro, Alessandro

doi:10.1080/10407782.2014.949133

Cited by 50 publications

(35 citation statements)

References 52 publications

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“…The numerical investigations have been carried out assuming the value of Rayleigh number at which oscillations start both in the case of free fluid in a partially porous tall rectangular enclosure [23] In order to investigate the behavior of the flow regime with the annulus radius, several analyses have been carried out by changing the radius ratio ro/ri in the range between 3 and 1.1.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, all these works are based on simplifying hypothesis; in fact, only few works referring to square cavities [14] or infinite domains [15] refer to very specific conditions, such as nonBoussinesq convection [14] or non-Newtonian viscoelastic fluids [15]. As regards thermal analysis of partially porous cavities, while laminar free convection in partially porous square and rectangular domains has been extensively analyzed both in steady [16][17][18][19][20] and transient conditions [21][22][23], few works concerning natural convection in partially vertical cylindrical cavities are available in scientific literature [24][25][26][27][28][29]. Moreover, only few papers [28][29] did not overlook transient regime, despite many engineering applications of the enclosure problem are related to real systems operating in dynamic mode.…”

Section: Introductionmentioning

confidence: 99%

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Transient Natural Convection in Partially Porous Vertical Annuli

Arpino¹,

Carotenuto²,

Ciccolella³

et al. 2016

IJHT

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The numerical modeling of natural convection in partially porous annuli is a topic of rising interest, due to its practical applications for the provisional analyses of several engineering applications such as geothermal down-hole heat exchangers, chemical reactors, etc. Though a large number of papers focused on the modeling of this phenomenon under steady-state conditions, only few works consider its transient thermal evolution and no works are available referred to partially porous annular cavities. However, most of the real technical applications operate in dynamic mode, for this reason, this paper focuses on the transient numerical analysis of heat transfer in partially porous annular enclosures, where natural convection occurs. A fully explicit version of the CBS algorithm is employed here to solve the generalized porous medium model which describes both the sub-domains of the cavity using only one equations set; a dual time stepping technique is employed for transient analyses. Several cases have been analyzed, by changing the cavity aspect ratio and thermo-physical parameters of the fluid. Several results have been presented by changing both porous medium's properties and geometrical characteristics of the domain. The obtained results highlight that both the properties and the position of porous layer, inserted into the computational domain, strongly influence the thermal behavior of the cavity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transient Natural Convection in Partially Porous Vertical Annuli

Arpino¹,

Carotenuto²,

Ciccolella³

et al. 2016

IJHT

Self Cite

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“…Therefore, it is necessary to conduct dynamic analysis of the dehumidifier with considering the velocity field. On the other hand, lots of papers reported applying CFD (computational fluid dynamics) technology to describe the complex behaviors of the heat and mass transfer in the equipment [34,35]. And CFD software Fluent is widely used as it is capable of simultaneous simulation of the fluid dynamics and mass transfer.…”

Section: Introductionmentioning

confidence: 99%

Study on an internally-cooled liquid desiccant dehumidifier with CFD model

Luo¹,

Chen

Yang

et al. 2017

Applied Energy

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“…Further details on code validation, stability conditions and the derivation of the algorithm are available in references [28][29][30][31].…”

Section: Numerical Modelmentioning

confidence: 99%

Influence of one porous layer insert on the transient heat transfer in a tall annulus in presence of large source terms

Arpino¹,

Ciccolella²,

Cortellessa³

et al. 2017

IJHT

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This paper provides a sensitivity analysis on the influence of one porous layer insert on the transient behavior of natural convection in a tall annular enclosure in presence of large source terms. The porous medium which partially fills the cavity is characterized by a low value of the Darcy number, typical of insulating materials and metallic foams, often employed in heat exchangers and other engineering applications. A stabilized, fully explicit version of the Compressibility Based Scheme is here employed and validated against experimental data available in the scientific literature for steady and unsteady convection in vertical cylindrical enclosures. Several analyses are presented here by changing both the geometrical features of the cavity and the properties of the porous domain. The results of these analyses demonstrate that not only the thermo-physical properties of the porous medium but also the position and the thickness of the porous layer strongly affect the transient behavior of the convective phenomena occurring in the cavity.

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Transient Thermal Analysis of Natural Convection in Porous and Partially Porous Cavities

Cited by 50 publications

References 52 publications

Transient Natural Convection in Partially Porous Vertical Annuli

Transient Natural Convection in Partially Porous Vertical Annuli

Study on an internally-cooled liquid desiccant dehumidifier with CFD model

Influence of one porous layer insert on the transient heat transfer in a tall annulus in presence of large source terms

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