Natural convection heat transfer from a heat sink with hollow/perforated circular pin fins

Elshafei, E. A. M.

doi:10.1016/j.energy.2010.03.016

Cited by 103 publications

(38 citation statements)

References 18 publications

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“…Many studies have investigated optimising fin shapes. Other studies have introduced shape adjustments by cutting some material from the fins to make cavities, holes, slots, grooves or channels through the fin body to increase the heat transfer area and/or the heat transfer coefficient (Elshafei, 2010).…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Natural Convection Heat Transfer from the Rectangular Fins by Circular Perforations

Doori¹

2011

Int J Automot Mech Eng

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The importance of heat transfer by natural convection in enclosures can be found in many engineering applications, such as energy transfer in buildings, solar collectors, nuclear reactors and electronic packaging. An experimental study was conducted to investigate heat transfer by natural convection in a rectangular fin plate with circular perforations as heat sinks. The patterns of the perforations included 24 circular perforations (holes) for the first fin; the number of perforations increased by eight for each fin to 56 in the fifth fin. These perforations were distributed in 6-14 rows and four columns. Experiments were carried out in an experimental facility that was specifically designed and constructed for this purpose. It was observed that the temperature along the non-perforated fin dropped from 30 to 25°C, but the temperature drop for the perforated fins was from 30 to 23.7°C at low power (6 W). The drop in temperature between the fin base and the tip increased as the diameter of the perforations increased. The temperature drop at the highest power (220 W) was from 250 to 49°C for the nonperforated fin and from 250 to 36°C for the perforated fins. The heat transfer rate and the coefficient of heat transfer increased with an increased number of perforations.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Natural Convection Heat Transfer from the Rectangular Fins by Circular Perforations

Doori¹

2011

Int J Automot Mech Eng

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“…According to the concept of Enthalpy change, entropy generation can be calculated by the equation (10).…”

Section: Entropy Generation Minimizationmentioning

confidence: 99%

“…A copper material possesses higher thermal conductivity when compared with other material by [9], also a large number of perforated were given the higher heat transfer coefficient. While, the larger hollow pin diameter ratio, offered higher augmentation factor for upward orientation, and the situation was reversed for sideward orientation for the circular pin fin using the circular perforation that are studied by [10].…”

Section: Introductionmentioning

confidence: 99%

Optimization of a rectangular pin fin using rectangular perforations with different inclination angles

Jasim¹,

Söylemezr²

2017

IJHT

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Perforated fins, because of their compactness, low weight and high effectiveness are widely used in heat sinks to enhance the heat transfer from electronic equipments. The innovative form of the perforated fin (with inclination angles) was considered for the rectangular pin fin. In the analytical solution, the Degenerate Hypergeometric Equation (DHE) was used as a new derivative method and then solved by Kummer's series. Also, Signum function is used to model the opposite and mutable approach heat transfer area. This article presents a combined open literature and Experimental work of various cases to validate the analytical study. Two models were perforated experimentally at the 5mm from bottom tip at a various inclination angles by using a wire cut electrical discharge machining (Wire EDM) and EDM drilling machine. The present mathematical model has good reliability according to the high agreement of the validation results about (0.33%-1.4%). It was found that use of the inclined perforation fin leads to decreased thermal resistance and improvement in the thermal performance of the pin fin by enhancing the heat transfer. Also, the optimization can be achieved by minimizing the weight and length of the pin fin based on the Multi advantages of the present model. Likewise, Entropy generation was minimized with increases the open area ratio at a certain Rayleigh number and constant heat flux.

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“…(Bayram et al 2008 b ) proved the efficiency can be increased by 1.4 to 2.6 for circular pin fin with a circular section of perforated by optimized the Nusselt number and friction factor separately and then together. (Elshafei 2010) presented the study about the hollow fin with the circular perforated, the results show the increase of the heat transfer depended on the orientation and diameter ratio.…”

Section: Introductionmentioning

confidence: 99%

The Temperature Profile for The Innovative Design of the Perforated Fin

Al-Saddy

Söylemez

2016

Int. J. Renew. Energy Dev.

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ABSTRACT. Many studies had proposed the development of the heat sink by using the straight perforated fin .Today increasing the demand for the more effective design due to the growth of the heat sources in the different energy devices. This paper presents the new design (inclined perforated) of the pin fin and find the temperature distribution based on the a novel derivative method. Perforated with rectangular section and different angles of inclination was considered. Signum Function is used for modeling the variable heat transfer area. Set of parameters to handle the conduction and convection area were calculated. Degenerate Hypergeometric Equation (DHE) was used for modeling the complex energy differential equation and then solved by Kummer's series. In the validation process, Ansys 16.0-Steady State Thermal was adopted. For the calculation process, two models (I & II) were considered. The high agreement of the validation results about (0.25%) leads to the big reliability of the presented model. The results show the improvement of the temperature difference and heat transfer ratio according to the increase of the inclination angle and perforated size. Improved of Heat transfer ratio is ranging from 13% to 50%.

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Natural convection heat transfer from a heat sink with hollow/perforated circular pin fins

Cited by 103 publications

References 18 publications

Enhancement of Natural Convection Heat Transfer from the Rectangular Fins by Circular Perforations

Enhancement of Natural Convection Heat Transfer from the Rectangular Fins by Circular Perforations

Optimization of a rectangular pin fin using rectangular perforations with different inclination angles

The Temperature Profile for The Innovative Design of the Perforated Fin

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