Natural convection from rectangular interrupted fins

The paper deals with the analytical and experimental determination of the forced convection heat transfer coefficients over the flat coil module. In the analytical part, the forced convection coefficients at different wind speeds are calculated based on various known equations of the forced convection heat transfer coefficient with unheated starting length. The experimental part presents the description of the test: loading the coil with DC current and measurements of the coil temperatures with thermal sensors while it was inside a wind tunnel. Based on the measurement, the convection coefficients were determined. In the final part, the experimental and analytical results are compared. It is found that the accuracy of the analytical results is more precise in highly turbulent flows.

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“…Furthermore, the standard accuracy of the K-type thermocouple is 0.75 %. According to [16], power uncertainty is evaluated as:…”

Section: A Uncertainty Analysis Of Experimental Resultsmentioning

confidence: 99%

“…Also, the radiation coefficients were calculated analytically by using (17). Finally, the forced convection coefficients were calculated based on (16). In the analytical calculation, as the coil box is located inside the wind tunnel, its boundary layer cannot develop as in the free stream mode.…”

Section: Resultsmentioning

confidence: 99%

Determination of Heat Transfer Coefficient for the Air Forced Cooling Over a Flat Side of Coil

Ghahfarokhi

Kallaste

Belahcen

et al. 2019

Electrical, Control and Communication Engineering

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“…They also observed that the rate of heat transfer is maximum at a fin density of 1 pin/cm 2 . Ahmadi et al [4] have investigated the heat transfer characteristics of highly populated pin fin arrays for three different orientations in the gravity field. It is observed that among the three orientations, the vertically upward facing fin array yielded the highest heat transfer rates, followed by the horizontal fin array and the vertically downward facing fin array similar to the observation reported by Huang et al [3].…”

Section: Introductionmentioning

confidence: 99%

“…They also specified the contribution of radiation heat transfer in combined mode of heat transfer and defined an optimal fin population. The effect of steady state external natural convective heat transfer of interrupted rectangular fins facing upward is investigated numerically and experimentally by Ahmadi et al [4]. They concluded that adding interruptions to vertically-mounted rectangular fins can enhance the thermal performance considerably and that an optimum fin interruption exists.…”

Section: Introductionmentioning

confidence: 99%

Effect of an axial hole on natural convection heat transfer from a cylindrical pin fin attached to a horizontal plate

2018

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Original scientific paper https://doi.org/10.2298/TSCI160213258MHeat transfer under laminar natural convection from a hollow cylindrical fin mounted on a horizontal base plate has been numerically studied. The flow outside the fin is much stronger than that inside the hole and as a consequence the rate of heat transfer from a hollow fin is primarily due to the contribution by the outer surface of the fin. Fortunately, the rate of heat transfer is not negatively affected by the presence of the hole at the fin centre. On the contrary, when the Grashof number is higher or the hole diameter is bigger, the inside surface contributes marginally to the heat transfer. A hollow fin saves material and weighs less compared to a solid fin. So, this feature may be exploited.

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“…Lin et al [9] studied the staggered circular tube bank fin heat exchanger with curved delta winglet vortex generators for heat transfer and fluid flow characteristics and concluded that interrupted annular groove fin shows excellent performance at higher Reynolds number and the annular groove's radial and circumferential locations have a very little effect on the average heat transfer and fluid flow characteristics. Ahmadi et al [10] studied numerically and experimentally the steady-state external natural convection heat transfer from vertically-mounted rectangular interrupted fins. They found that adding interruptions to verticallymounted rectangular fins can enhance the heat transfer considerably.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Rectangular Fins with Holes in Free Convection

Singh¹

2017

IJRASET

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In the present work, an experimental study has been conducted on rectangular fin array with holes under free convection heat transfer. The effect of perforation diameter and angle of inclination on heat transfer from rectangular fin array have been analysed. The performance of solid fin array and the perforated fin arrays with fin spacing 6mm, fin perforation diameter of 4, 6 and 8mm, and fin inclination angle 0, 30, 45, 60 and 90º, are investigated and compared in steady state heat transfer. It was found that with the increase in the fin perforation diameter, the increase in the heat transfer rate was achieved with the advantage of weight reduction of fin array block. With the increase in fin inclination angle from 0 to 90º, an increase in heat transfer rate was also observed.

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Natural convection from rectangular interrupted fins

Cited by 87 publications

References 30 publications

Determination of Heat Transfer Coefficient for the Air Forced Cooling Over a Flat Side of Coil

Determination of Heat Transfer Coefficient for the Air Forced Cooling Over a Flat Side of Coil

Effect of an axial hole on natural convection heat transfer from a cylindrical pin fin attached to a horizontal plate

Performance Evaluation of Rectangular Fins with Holes in Free Convection

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