Influence of wall conduction on natural convection in an inclined square enclosure

Acharya, Sumanta; Tsang, C. H.

doi:10.1007/bf01008214

Cited by 11 publications

(6 citation statements)

References 15 publications

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“…This transition from a one-cell inner core structure to a multicellular one is qualitatively similar to that obtained by Acharya and Tsang [22] when they consider only natural convection in a hollow block filled with air. When considering heat and mass diffusive walls, the thermal stratification at the center of the cavity is replaced by x-decreasing temperature.…”

Section: Effect Of R C and R D On The Main Flowsupporting

confidence: 86%

Effect of Heat and Mass Transfer Through Diffusive Walls on Three-Dimensional Double-Diffusive Natural Convection

Abidi¹,

Kolsi²,

Borjini³

et al. 2008

Numerical Heat Transfer, Part A: Applications

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A three-dimensional numerical study using vorticity-vector potential formulations based on the finite-volume method has been performed to investigate double-diffusive convection in a stack of cubic enclosures submitted to horizontal gradients of temperature and concentration. The flow is driven by conditions of constant temperature and concentration imposed along the two vertical side walls of each cubic enclosure, while the horizontal walls are diffusive in heat and mass. This numerical study is conducted for fixed Prandtl, Rayleigh, and Lewis numbers, Pr ¼ 10, Ra ¼ 10 5 and Le ¼ 10, buoyancy ratio N in the range [À2, 0], and for a range of heat and mass transfer diffusion coefficients. The results show that the effect of heat and mass diffusive walls differs between the case of thermally dominated flow and the compositionally dominated one. For thermally dominated flow, considering heat and mass diffusive walls results in a change from a structure with one inner core to a multicore structure and reduces the transverse velocity. On the other hand, for solutally dominated flow, an ''inverse transition'' from a multicell pattern to a unicellular one occurs, and the transverse velocity increases considerably.

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Section: Effect Of R C and R D On The Main Flowsupporting

confidence: 86%

Effect of Heat and Mass Transfer Through Diffusive Walls on Three-Dimensional Double-Diffusive Natural Convection

Abidi¹,

Kolsi²,

Borjini³

et al. 2008

Numerical Heat Transfer, Part A: Applications

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“…Kaminski and Prakash (1986) and Misra and Sarkar (1997) performed a numerical study on conjugate convection in a square enclosure with thick conducting wall on one of its vertical sides. The influence of wall conduction on natural convection in an inclined square enclosure was examined by Acharya and Tsang (1987), Yedder and Bilgen (1997) and Nouanegue, Muftuoglu, and Bilgen (2009). Du and Bilgen (1992) found that the temperature distribution on the solid-fluid interface is greatly influenced by the coupling effect between solid wall conduction and fluid convection.…”

Section: Introductionmentioning

confidence: 99%

Conjugate Natural Convection Heat Transfer in a Rotating Enclosure

Saleh

Hashim²

2016

JAFM

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The aim of the present numerical study to analyze the conjugate natural convection heat transfer in a rotating enclosure with finite wall thickness. The enclosure executes a steady counterclockwise angular velocity about its longitudinal axis. The staggered grid arrangement together with the Marker and Cell (MAC) method was employed to solve the governing equations. The governing parameters considered are the wall thickness, 0.05 ≤ D ≤ 0.2, the conductivity ratio, 0.5 ≤ Kr ≤ 10 and the Taylor number, 8.9 × 10 4 ≤ Ta ≤ 1.1 × 10 6 , and the centrifugal force is assumed weaker than the Coriolis force. It is found that decreasing the conductivity ratio or/and rotational speed stabilize of the convective flow and heat transfer oscillation. The global quantity of the heat transfer rate increases by increasing the conductivity ratio and it decreases about 12% by increasing 20% wall thickness for the considered rotational speeds.

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“…These physical phenomena involve different heat transfer processes (coupling convection/conduction) which can affect several aspects related to sustainable architecture and design of buildings and cities, such as the reduction of energy demand [1][2][3][4][5][6], the decrease of the environmental impact [7,8] and the analysis of the urban canyon effect [9,10]. Differentially heated enclosures have been widely studied in the past [11][12][13][14][15]. However, the complexity of the problem has led the researchers to apply several simplifications in the analysis of these phenomena, such as setting the outdoor conditions as steady or considering indoor microclimate as a controlled environment (where the interior conditions are set, and, if required, dynamically controlled by an HVAC system).…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamic Modelling of Thermal Periodic Stabilized Regime in Passive Buildings

et al. 2016

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Abstract:The periodic stabilized regime is the condition where the temperature of each point of a certain environment varies following a periodic law. This phenomenon occurs in many practical applications, such as passive or ancient buildings not equipped with Heating, Ventilating and Air Conditioning HVAC systems and located in latitudes where the temperature greatly varies with Earth's daily cycles. Despite that, the study of transient phenomena is often simplified, i.e., considering negligible the thermal response of the indoor microclimate. An exact solution to enclosures whose microclimate is free to evolve under a periodic stabilized regime does not exist nowadays, also from an analytical point of view. The aim of this study is to parametrically analyze the thermal variations inside a room when a transient periodic temperature is applied on one side. The phenomenon has been numerically studied through Computational Fluid Dynamics (CFD) and analytically validated using a function that reproduces the daily variation of the outdoor temperature. The results of this research would lay the groundwork to develop analytical correlations to solve and predict the thermal behavior of environments subject to a periodic stabilized regime.

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Influence of wall conduction on natural convection in an inclined square enclosure

Cited by 11 publications

References 15 publications

Effect of Heat and Mass Transfer Through Diffusive Walls on Three-Dimensional Double-Diffusive Natural Convection

Effect of Heat and Mass Transfer Through Diffusive Walls on Three-Dimensional Double-Diffusive Natural Convection

Conjugate Natural Convection Heat Transfer in a Rotating Enclosure

Computational Fluid Dynamic Modelling of Thermal Periodic Stabilized Regime in Passive Buildings

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