Natural convection from a horizontal cylinder in a rectangular cavity

Cesini, G.; Paroncini, M.; Cortella, Giovanni; Manzan, Marco

doi:10.1016/s0017-9310(98)00266-x

Cited by 172 publications

(81 citation statements)

References 8 publications

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“…Saitoh et al [5] also investigated the natural convection heat transfer from a cylinder in air using finite difference methods. Kuehn and Goldstein [3], Farouk and Güçeri [4] and Cesini et al [6] have all shown that the heat transfer is at its maximum at the bottom of the cylinder and decreases toward the top of the cylinder. The decrease in heat transfer is attributed to an increase of the thermal boundary layer thickness.…”

Section: Introductionmentioning

confidence: 99%

“…Cesini et al [6] investigated the effect of horizontal confinement on natural convection. In this case the aspect ratio was defined as the ratio of the tank width to the diameter of the cylinder.…”

Section: Introductionmentioning

confidence: 99%

“…In this case the aspect ratio was defined as the ratio of the tank width to the diameter of the cylinder. Cesini et al [6] proposed that for low Rayleigh numbers (1.3 x 10 3 to 7.5 x 10 4 ) there is an optimum aspect ratio for heat transfer, in the range between 2.1 and 4.3, and that this decreased as Ra increased. For higher Rayleigh numbers Cesini et al [6] have shown that the effect of the horizontal confinement was small relative to the effects of greater buoyancy forces.…”

Section: Introductionmentioning

confidence: 99%

“…Cesini et al [6] proposed that for low Rayleigh numbers (1.3 x 10 3 to 7.5 x 10 4 ) there is an optimum aspect ratio for heat transfer, in the range between 2.1 and 4.3, and that this decreased as Ra increased. For higher Rayleigh numbers Cesini et al [6] have shown that the effect of the horizontal confinement was small relative to the effects of greater buoyancy forces. The effect of vertical confinement on the natural convection around a heated horizontal cylinder was investigated by Atmane et al [9].…”

Section: Introductionmentioning

confidence: 99%

“…T 0°, 70°, 110° and 180° are presented in figure 4 for a Rayleigh number of 4 x 10 6 . Clear periodicity at very low frequencies has been found at each location.…”

mentioning

confidence: 99%

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Natural convection around a horizontal heated cylinder: The effects of vertical confinement

Atmane¹,

Chan

Murray

2003

International Journal of Heat and Mass Transfer

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Natural convection heat transfer from a single horizontal cylinder and a pair of vertically aligned horizontal cylinders is investigated. Surface heat transfer distributions around the circumference of the cylinders are presented for Rayleigh numbers of 2 x 10 6 , 4 x 10 6 and 6 x 10 6 and a range of cylinder spacings of 1.5, 2 and 3 diameters. With a cylinder pairing the lower cylinder is unaffected by the presence of the second cylinder; the same is true of the upper cylinder if the lower one is not heated. However, when both cylinders are heated it has been found that a plume rising from the heated lower cylinder interacts with the upper cylinder and significantly affects the surface heat transfer distribution. Spectral analysis of surface heat transfer signals has established the influence of the plume oscillations on the heat transfer. Thus, when the plume from the lower cylinder oscillates out of phase with the flow around the upper cylinder it increases the mixing and results in enhanced heat transfer.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…T 0°, 70°, 110° and 180° are presented in figure 4 for a Rayleigh number of 4 x 10 6 . Clear periodicity at very low frequencies has been found at each location.…”

mentioning

confidence: 99%

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Natural convection around a horizontal heated cylinder: The effects of vertical confinement

Atmane¹,

Chan

Murray

2003

International Journal of Heat and Mass Transfer

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An experimental investigation on the effect of a perforated fin on free convection heat transfer from a confined horizontal cylinder

Rezaei

Ziabasharhagh

2013

Heat Trans. Asian Res.

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Natural convection heat transfer from an isothermal horizontal fin attached to a cylinder, confined between two adiabatic walls of constant height is investigated by the Mach-Zehnder interferometry technique. This study is focused on the effect of a perforated fin attached to the bottom of a cylinder while the vertical position of the cylinder (Y) changes between two walls with a constant distance of W measuring 1.5 times the cylinder diameter. The cylinder's average Nusselt numbers are determined for three ratios of vertical position to its diameter, Y/D = 0.5, 1.5, 2, and 3. The Rayleigh number ranges from 4.5 × 10 3 to 1.2 × 10 4 . The distance between the walls is chosen to be 1.5 D, that is, an optimum distance at which the Nusselt number is maximum. The effect of the perforated fin on free convection heat transfer is investigated and compared with other works. Results show outstanding enhancement in heat transfer, with a minimum result of 40% and maximum of 90%.

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Numerical study of mixed convective heat transfer in a lid‐driven enclosure with rotating cylinders

Dalvi

Bali

Nayka

et al. 2019

Heat Trans. Asian Res.

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A numerical simulation is performed to characterize the mixed convective transport in a three‐dimensional square lid‐driven enclosure with two rotating cylinders. The top wall is moving in the positive x‐direction, and the bottom wall is at a higher fixed temperature compared with all other isothermal walls. Both cylinders are rotating in its own plane about their centroidal axis. On the basis of rotation of both cylinders in clockwise or counter‐clockwise directions, four rotational models are studied. Various controlling parameters considered in the present study are Grashof number (10 3 < Gr < 10 5), rotating speed of the cylinder (5 < ω < 50), and the Reynolds number based on top wall movement is fixed to 100. The effect of cylinder rotation on the heat transfer of bottom wall is reported with the help of streamlines, contour plots of z‐component of vorticity, averaged and local Nusselt number, ratios of secondary flow and drag coefficient. It is observed that the heat transfer at the bottom wall is substantially dependent on the rotational model and rotational speed of the cylinder.

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Natural convection from a horizontal cylinder in a rectangular cavity

Cited by 172 publications

References 8 publications

Natural convection around a horizontal heated cylinder: The effects of vertical confinement

Natural convection around a horizontal heated cylinder: The effects of vertical confinement

An experimental investigation on the effect of a perforated fin on free convection heat transfer from a confined horizontal cylinder

Numerical study of mixed convective heat transfer in a lid‐driven enclosure with rotating cylinders

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