Natural convection flow patterns in spherical annuli

Yin, Shi; Powe, R. E.; Scanlan, J. A.; Bishop, E. H.

doi:10.1016/0017-9310(73)90168-3

Cited by 65 publications

(36 citation statements)

References 4 publications

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“…Experimental studies and flow visualisation conducted on natural convection within concentric isothermal spheres (similar geometry as domes) showed that the flow pattern is mono-cellular for large gap spacings when the inner sphere is hotter than the outer one [3][4][5]. A large cell extends from the bottom to the top of the spheres.…”

Section: Introductionmentioning

confidence: 99%

Natural convection heat transfer within multi-layer domes

Laouadi

Atif

2001

International Journal of Heat and Mass Transfer

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/S0017-9310(00)00195-2International Journal of Heat and Mass Transfer, 44, 10, pp. 1973-1981, 2001 Natural convection heat transfer within multi-layer domes Laouadi, A.; Atif, M. R. Natural convection heat transfer within multilayer domes Laouadi, A.; Atif, M. R.A version of this paper is published in / Une version de ce document se trouve dans : International Journal of Heat and Mass Transfer, v. 44, no. 10, May 2001, pp. 1973-1981 www.nrc.ca/irc/ircpubs on natural convection heat transfer within these layers. This information is required for the evaluation of the dome thermal performance (e.g., the U-factor). NRCC-43954 Natural Convection Heat Transfer within Multi-layer DomesThis paper presents a numerical study on heat transfer by laminar natural convection within multi-layer domes with uniform spacing heated from the outside. The flow and temperature fields within the domed enclosure were obtained using the control volume approach combined with the fully implicit scheme. Correlations for the heat transfer as a function of the dome shape and the gap spacing between the layers were developed under steady state conditions. The results showed that the convection heat transfer for fully hemispheric domes (half of spheres) may reach more than 13% higher than that for low profile domes (hemispherical caps) for small gap spacings (gap spacingto-radius ratio δ < 0.1) and more than 100% for large gap spacings (δ > 0.3). The critical gap spacing that yields the maximum heat transfer was quantified for each dome shape.2

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Section: Introductionmentioning

confidence: 99%

Natural convection heat transfer within multi-layer domes

Laouadi

Atif

2001

International Journal of Heat and Mass Transfer

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“…A commercial CFD package [11] was used to solve the governing equations (3) to (6). First, the equations were discretized using the control volume approach and the implicit and segregated schemes [12].…”

Section: Numerical Proceduresmentioning

confidence: 99%

“…First, the equations were discretized using the control volume approach and the implicit and segregated schemes [12]. The second order upwind scheme was used to discretize the momentum and energy equations (4) to (6).…”

Section: Numerical Proceduresmentioning

confidence: 99%

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Convective heat transfer in domed skylight cavities

Sartipi

Laouadi

Naylor

et al. 2010

Journal of Building Performance Simulation

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10. 1080/19401491003653611 Journal of Building Performance Simulation, 3, 4, pp. 269-287, 2010-11-25 Convective heat transfer in domed skylight cavities Sartipi, A.; Laouadi, A.; Naylor, D.; Dhib, R. The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. For more information visit http://laws.justice.gc.ca/en/showtdm/cs/C-42Les renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. Pour obtenir de plus amples renseignements : http://lois.justice.gc.ca/fr/showtdm/cs/C-42 This information is required to evaluate the thermal performance of domed skylights for product rating purposes, or to evaluate the heat loss or gain of installed skylights in buildings. This paper presents a numerical study on the laminar natural convection in horizontal concentric domed cavities heated from the inside surface. A commercial CFD package is used to solve for the flow and temperature fields. The results show that for large cavity gap spacing-to-radius ratios, the cavity flow is mono-cellular and steady state. For small gap spacing ratios, however, the cavity flow may be multi-cellular and transient periodic. CONVECTIVE HEAT TRANSFER IN DOMED SKYLIGHT CAVITIESPractical correlations for the heat transfer coefficient as a function of the cavity shape and gap spacing ratio are developed for both flow regimes. The critical gap spacing ratio that yields the maximum Nusselt number is quantified for each cavity shape.

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“…They concerned mainly natural convection between concentric spheres, whose inner and outer parts are both stationary. Experimental research on natural convection in annuli between two isothermal concentric spheres has been described by Bishop et al [10,11], Scanlan et al [12] and Yin et al [13] for a very wide range of Prandtl and Rayleigh numbers. Temperature distribution within the annuli was measured and Nusselt±Grashof number correlations were presented.…”

Section: International Journal Of Heat and Mass Transfer 43 (2000) 88mentioning

confidence: 99%

Flow bifurcation and heat transfer in a spherical gap

Luo

Yang

2000

International Journal of Heat and Mass Transfer

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This paper investigates the steady¯ow and heat transfer between two concentric spheres with the inner one rotating and the outer one stationary for the gap width of s=0.18. A continuation method is applied to study the bifurcation structure of the discretized governing equations. The resulting Jacobian matrix along with a test function approach is used to locate the bifurcation points. A bifurcation diagram of the¯ow is constructed for Re < 1200. Seven steady¯ow modes are predicted. Linear stability analysis is used to determine the stability of each¯ow mode. Temperature distribution and heat transfer rate of each¯ow mode are also computed and analyzed. #

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Natural convection flow patterns in spherical annuli

Cited by 65 publications

References 4 publications

Natural convection heat transfer within multi-layer domes

Natural convection heat transfer within multi-layer domes

Convective heat transfer in domed skylight cavities

Flow bifurcation and heat transfer in a spherical gap

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