The effects of fin parameters on the radiation and free convection heat transfer from a finned horizontal cylindrical heater

Karabacak, Rasim

doi:10.1016/0196-8904(92)90134-i

Cited by 9 publications

(3 citation statements)

References 4 publications

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“…In a vertical module two different fins geometries can be considered: horizontal and vertical fins. There is much more literature for horizontal fins [10][11][12][13][14][15][16][17][18][19][20][21][22], but this geometry interferes with the natural convection in the PCM module. On the other hand there is no literature for vertical fins around circular vertical tubes, but this geometry would improve natural convection in the water side of the PCM module.…”

mentioning

confidence: 99%

Natural convection heat transfer coefficients in phase change material (PCM) modules with external vertical fins

Castell¹,

Solé²,

Medrano³

et al. 2008

Applied Thermal Engineering

174

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mentioning

confidence: 99%

Natural convection heat transfer coefficients in phase change material (PCM) modules with external vertical fins

Castell¹,

Solé²,

Medrano³

et al. 2008

Applied Thermal Engineering

174

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“…A detailed analysis is conducted on the impact of the governing factors on the heat transfer attributes. Karabacak et al [21] conducted several experiments to find how fin characteristics affect free convection in the horizontal cylindrical heater with fins. The influence of fin diameter and spacing on heat dissipation is examined using this experimental model.…”

Section: Introductionmentioning

confidence: 99%

3-D investigation of coupled free convection and thermal radiation in interconnected cavities.

Ghazi,

Sharma

2024

Preprint

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Coupled free convection and thermal radiation heat transfer and fluid flow characteristics on vertical cylinder in interconnected cavities have been investigated numerically in laminar regimes. The study is carried out for varying Rayleigh numbers ranging from (7x103 to 2.5x106) and also for emissivity values between 0 to 1. The effects of various cavity geometries, hole geometries, hole dimensions, and cavity hole arrangements on heat transfer attributes have been evaluated. In this study, the algebraic multi-grid solver of Ansys fluent is used to perform the simulations of the Navier-Stokes equation combined with the energy equation in the computational domain. A thorough grid sensitivity analysis and validation of the numerical methodology used in the simulation are carried out. The results are validated against the published data in the literature. It is found that the circular hole of 15mm radius at 45⁰ orientations on an alternate interconnected cavity exhibits the highest rate of heat transfer. It is seen that as the hole radius is increased, the value of the Nusselt number also increases significantly. However Nusselt number gets saturated beyond 15mm, thereafter no significant increase in the Nusselt number is observed. For a maximum Ra (2.5x105) and hole radius of 15mm at 45⁰ orientations exhibits, the total increment in the rate of heat transfer is ∼110%. Correlations are established to forecast the Nusselt number for vertical annular interconnected cavities as a function of cavity width to cylinder diameter ratio (w/d) and Rayleigh number (Ra), using least square linear regression method.

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“…Two different geometries have been studied: horizontal and vertical fins. There is much more literature about horizontal fins [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] but this geometry interferes natural convection in the water. No literature is available for vertical fins around circular vertical cylinders, but this geometry improves the natural convection of the system.…”

Section: Introductionmentioning

confidence: 99%

Effect of using external vertical fins in phase change material modules for domestic hot water tanks.

Castell¹,

Cutrona²,

Medrano³

et al. 2006

REPQJ

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The effect of using external vertical fins in Phase Change Materials (PCM) modules to improve the natural convection coefficient in water is studied in this paper. The use of PCM in a water tank working with a solar system is able to store a lot of energy, but it is necessary to transfer this energy to the water during demand. Optimization of the natural convection to the water is of great importance for the heat transfer. External fins increase the heat transfer surface and the heat transfer coefficient changes. Experimental work was carried out to determine natural convection heat transfer coefficients for PCM modules with two different external vertical fin geometries. Results were presented as a temperature variation over time of the PCM and the water, and the heat transfer coefficient as a function of the temperature difference for different fins. These results were used to validate a simulation code to determine the behaviour of the system using finned PCM modules. The results prove the technical potential of external fins for heat storage systems using PCM. The experimental results were used to determine different correlations for Nusselt number as a function of different dimensionless numbers.

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The effects of fin parameters on the radiation and free convection heat transfer from a finned horizontal cylindrical heater

Cited by 9 publications

References 4 publications

Natural convection heat transfer coefficients in phase change material (PCM) modules with external vertical fins

Natural convection heat transfer coefficients in phase change material (PCM) modules with external vertical fins

3-D investigation of coupled free convection and thermal radiation in interconnected cavities.

Effect of using external vertical fins in phase change material modules for domestic hot water tanks.

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