Natural convection experiments on a heated horizontal cylinder in a differentially heated square cavity

Butler, Colin; Newport, David; Geron, Marco

doi:10.1016/j.expthermflusci.2012.06.009

Cited by 40 publications

(11 citation statements)

References 36 publications

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“…At a relatively low Rayleigh numbers of Ra=10 3 , Ra=10 4 and Ra=10 5 , the numerical solutions show the timeindependent characteristics regardless of the variation in the radius of the inner cylinder. In addition, the flow and thermal structures obtained in three-dimensional domain configuration reveals almost two-dimensional pattern in the spanwise direction (z), and three-dimensionality in the system is not observed in this Rayleigh number range as shown in figures 3(a) ~ 3(c).…”

Section: Resultsmentioning

confidence: 92%

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Three-dimensional flow instability of natural convection induced by variation in radius of inner circular cylinder inside cubic enclosure

Seo

Doo

2016

International Journal of Heat and Mass Transfer

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Three-dimensional numerical simulations were conducted for the natural convection phenomena around a hot inner circular cylinder positioned in a cold cubic enclosure in the Raleigh number range of 10 3 ≤Ra≤106 at the Prandtl number of Pr=0.7. The Immersed Boundary Method (IBM) was used to capture the virtual wall boundary of the inner cylinder, based on the Finite Volume Method (FVM). In this study, the transition of the flow regime from the steady state to the unsteady state and consequent three-dimensionality in the system induced by the increase in the flow instability were investigated. Detailed three-dimensional vortical structures of the convection cells at a relatively high Rayleigh number of Ra=10 6 were analysed using the visualization technique, and the heat transfer characteristics in the system resulting from the change in the vortical structures were addressed.

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Section: Resultsmentioning

confidence: 92%

“…Natural convection heat transfer exhibits a great variety of complex dynamic behaviors, which depend greatly on the geometry and thermal conditions of the enclosure. Thus, the theoretical study of the phenomenon is comparatively difficult to understand and the experimental analysis of such systems has always inherent difficulties [3][4].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional flow instability of natural convection induced by variation in radius of inner circular cylinder inside cubic enclosure

Seo

Doo

2016

International Journal of Heat and Mass Transfer

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“…Some authors have studied the effect of aspect ratios of the cavity [7]. Also the type of investigation was numerical or experimental [8] or a combination of both [9]. Even though the natural convective heat transfer is considered as economical, the physics behind the natural convection is complex in nature.…”

Section: Introductionmentioning

confidence: 99%

Buoyancy enhanced natural convection inside the ventilated square enclosure with a partition and an overhanging transverse baffle

Kalidasan

Velkennedy

Kanna

2014

International Communications in Heat and Mass Transfer

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“…The flow and heat transfer for two different thermal boundary conditions (uniform wall temperature and uniform wall heat flux) were studied for different aspect ratios and the locations of the square cylinder. Butler et al [15] experimentally investigated the natural convection from a heat generating horizontal cylinder enclosed in a square cavity, where a temperature difference existed across its vertical walls for 2 Â 10 4 < Ra < 8 Â 10 4 and a Prandtl number of 0.71. Sasaguchi et al [16] reported the effect of the position of a cooled cylinder in a rectangular cavity on the cooling process of water around the cylinder.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Unsteady Natural Convection from Heated Horizontal Circular Cylinders in a Square Enclosure

Karimi¹,

Xu²,

Wang³

et al. 2014

Numerical Heat Transfer, Part A: Applications

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In this article, a 2-D numerical study is carried out to investigate the effect of this interaction on natural convection from two heated horizontal cylinders confined in a square enclosure with isothermal walls at the heat sink temperature. The simulations are carried out for Rayleigh numbers between 10 3 and 10 7 , and dimensionless horizontal distances of cylinders between 0.1 and 0.4. The results show that the variation of the area-averaged Nusselt number strongly depends on the distance between the two cylinders if Rayleigh numbers are less than 10 4 . In contrary, the effect of cylinder spacing on heat transfer was found to be nearly negligible when the Rayleigh number is between 10 4 and 10 7 . It is also observed that steady state flow and heat transfer undergo periodical oscillation, and ultimately chaotic oscillation in special positions of cylinders can occur.

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Natural convection experiments on a heated horizontal cylinder in a differentially heated square cavity

Cited by 40 publications

References 36 publications

Three-dimensional flow instability of natural convection induced by variation in radius of inner circular cylinder inside cubic enclosure

Three-dimensional flow instability of natural convection induced by variation in radius of inner circular cylinder inside cubic enclosure

Buoyancy enhanced natural convection inside the ventilated square enclosure with a partition and an overhanging transverse baffle

Numerical Simulation of Unsteady Natural Convection from Heated Horizontal Circular Cylinders in a Square Enclosure

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