Natural convection in an air-filled cavity: Experimental results at large Rayleigh numbers

Saury, Didier; Rouger, Nicolas; Djanna, Francis; Penot, François

doi:10.1016/j.icheatmasstransfer.2011.03.019

Cited by 57 publications

(35 citation statements)

References 25 publications

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“…Figure 2 shows the global flow circulation within the upper part of the cavity by presenting velocity fields and streamlines obtained in this study using Particule Image Velocimetry (PIV). These results reinforce previous assumptions [8] on the flow circulation. The main circulation follows the edges of the cavity, a recirculation zone is formed at the top of the cavity and at the border of the hot thermal boundary layer (2/3 of the cavity) and downward flow feeds the cold boundary layer.…”

Section: Experimental Devicesupporting

confidence: 92%

Experimental investigations in an air-filled differentially-heated cavity at large Rayleigh Numbers

Belleoud

Saury

Joubert

et al. 2012

J. Phys.: Conf. Ser.

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Abstract. A large-scale experimental differentially heated cavity was built and instrumented. Rayleigh numbers up to 1.2×10 11 can be obtained with a temperature difference, ∆T=20°C, between the hot and cold walls leaning in the range of validity of the Boussinesq approximation. Previous data obtained locally for mean velocity by 2D LDV in the range give rise to questions regarding the general air flow circulation in the cavity. Particularly, a downstream flow along the vertical boundary layer was observed. This reverse flow caused by the temperature stratification outside this layer is not present in the upstream parts and was not previously observed in smaller cavities. The question of the global circulation in this cavity is thus posed. Evolution laws providing Nusselt numbers are also given and when possible compared to the literature for a large range of Rayleigh numbers.

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Section: Experimental Devicesupporting

confidence: 92%

Experimental investigations in an air-filled differentially-heated cavity at large Rayleigh Numbers

Belleoud

Saury

Joubert

et al. 2012

J. Phys.: Conf. Ser.

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“…That is, there is no air movement from the exterior environment to the cavity or from the cavity to the outside, and there is a temperature difference between the interior and exterior surfaces. This phenomenon of differentially heated/cooled cavities has been studied extensively in the literature [2][3][4][5][6][7][8][9][10][11][12][13]. On the other hand, some double skin facade applications have been designed considering open cavity natural convection [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…The above studies related to an enclosed cavity for an airproof double skin facade mainly have low Rayleigh numbers. However, Rayleigh numbers are larger than 10 10 in some studies [10][11][12][13]. Trias et al [10,11] studied different Rayleigh numbers from 6.4 ⁄ 10 8 to 10 11 .…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical investigation of natural convection in a double skin facade

İnan

Başaran

Ezan

2016

Applied Thermal Engineering

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In this study, airflow and heat transfer in a rectangular cavity that simulates a double skin facade and includes natural convection were examined numerically and experimentally. This cavity separates the exterior space and the thermally controlled interior space. The temperatures of the surfaces that interact with these spaces were determined experimentally, while the other surfaces were regarded as adiabatic. With these temperature values, the parameters of the numerical study were defined. After the validation of the numerical model was completed based on experimental studies in the literature, the results related to flow and heat transfer in the cavity were analyzed. The numerical model provided results that agree with the air temperature values found experimentally in the cavity. Accordingly, in natural convection, with Rayleigh numbers ranging from 8.59 ∗ 109 to 1.41 ∗ 1010 and the effect of buoyancy on the regions close to the surface, the increasing tendency of the average Nusselt number from 142.6 to 168.8 was shown. In addition, a correlation between the Rayleigh and Nusselt numbers for a cavity aspect ratio of 8.64 was constructed to evaluate the heat flux; this correlation was also shown graphically.Scientific and Technological Research Council of Turkey (112M170

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“…Following this, numerical researchers have also been quick to respond to the experimental literature by conducting validation and exploratory studies on this very topic [8]. 25 The interest seems to be ongoing because more challenging situations are emerging with time [7,9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Emissivity on the Heat and Mass Transfer of Humid Air in a Cavity Filled with Solid Obstacles

Iyi

Hasan

Penlington

2014

Numerical Heat Transfer, Part A: Applications

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Section 6 of the "Repository policy for OpenAIR @ RGU" (available from http://www.rgu.ac.uk/staff-and-currentstudents/library/library-policies/repository-policies) provides guidance on the criteria under which RGU will consider withdrawing material from OpenAIR. If you believe that this item is subject to any of these criteria, or for any other reason should not be held on OpenAIR, then please contact openair-help@rgu.ac.uk with the details of the item and the nature of your complaint. The work reported here is a 2D numerical study on the buoyancy-driven low-speed turbulent flow of humid air inside a rectangular cavity partially filled with solid cylindrical objects for 10 a Rayleigh number of 1.45 Â 10 9 . Variations of Nusselt number, buoyancy flux, vapor mass fraction, and turbulence viscosity ratio are presented for various emissivity values of wall surfaces. It was observed that during the natural convection process, radiation effects are very significant and the air/water vapor combination results in a small increase in heat transfer as compared with the pure natural convection of dry air. 15

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Natural convection in an air-filled cavity: Experimental results at large Rayleigh numbers

Cited by 57 publications

References 25 publications

Experimental investigations in an air-filled differentially-heated cavity at large Rayleigh Numbers

Experimental investigations in an air-filled differentially-heated cavity at large Rayleigh Numbers

Experimental and numerical investigation of natural convection in a double skin facade

Effect of Emissivity on the Heat and Mass Transfer of Humid Air in a Cavity Filled with Solid Obstacles

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