Laminar forced convection heat transfer from laterally perforated-finned heat sinks

Shaeri, Mohammad Reza; Bonner, Richard

doi:10.1016/j.applthermaleng.2016.12.103

Cited by 36 publications

(10 citation statements)

References 44 publications

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“…The heat sinks in the experimental studies in [4] and [5] were made of 6063-T5 aluminum alloy and included 19 parallel channels (20 fins) with the fin thickness at 0.96 mm, and the channel length, height, and width at 203 mm, 22.86 mm, and 2.18 mm, respectively. Square cross-sectional perforations at three different perforation sizes and five different 122-2 porosities were fabricated on the lateral surfaces of the fins.…”

Section: Problem Description and Computational Approachmentioning

confidence: 99%

“…In the present study, heat transfer coefficients of a LPF are obtained through three-dimensional CFD and compared with those of acquired from experiments in the previous research at [4] and [5]. The operating conditions and the design parameters are maintained similar to those in the experimental studies.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, because of perforations, perforated fins reduce the weight of cooling systems. Investigating thermo-fluid mechanism in heat sinks made by perforated fins have been the subject of extensive research, particularly a series of research performed by the author in [1], [4], and [5]. However, still knowledge in thermo-fluid phenomena in perforated fins is limited due to lack of understanding the flow patterns over perforations.…”

Section: Introductionmentioning

confidence: 99%

“…However, still knowledge in thermo-fluid phenomena in perforated fins is limited due to lack of understanding the flow patterns over perforations. In the recent research by the author in [4] and [5], thermal performances of LPFs were investigated through detailed experiments and for the first time in the literature, correlations were developed to predict Nusselt numbers in LPFs. Also, it was demonstrated that the heat transfer in LPFs is mainly dictated by the interactions of flow over perforations.…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Coefficients in Perforated Fins

Brown¹,

Shaeri²

2022

International Conference on Fluid Flow, Heat and Mass Transfer

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Three-dimensional steady state and incompressible flow and heat transfer are simulated over a perforated fin to validate the numerical heat transfer coefficients with experimental data. The validated numerical approach is necessary to investigate the complex flow patterns over perforations, which is difficult and costly to capture through experiments. Perforations with square cross sections are distributed equidistantly along the length of the fin. The simulation is performed for a laminar airflow with Reynolds numbers between 992 and 1722. The Navier-Stokes and energy equations are discretized through the finite volume approach, and the pressure and velocity components are coupled by the SIMPLEC algorithm. Excellent agreements (below 6.1%) are obtained by comparing average numerical and experimental Nusselt numbers. Suggestions for future research to address the current gaps in understanding the thermo-fluid mechanism in perforated fins are provided.

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Section: Problem Description and Computational Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Coefficients in Perforated Fins

Brown¹,

Shaeri²

2022

International Conference on Fluid Flow, Heat and Mass Transfer

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“…The results showed that the enhancement of the heat transfer coefficient was obtained with 12 mm diameter perforated fins with an orientation angle of 45°. Shaeri and Bonner 38 experimentally analyzed laminar forced convective heat transfer from the laterally perforated finned heat sink. Outcomes showed that pressure drop was increased in laterally perforated finned heat sinks due to cavities.…”

Section: Experimental Studiesmentioning

confidence: 99%

Improvement of heat transfer through fins: A brief review of recent developments

Maji¹,

Choubey

2020

Heat Trans

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Fins or extended surfaces are generally used in heat exchangers to enhance heat transfer between the main surface and ambient fluid. Various types of simple-shaped fins, namely, rectangular, square, annular, cylindrical, and tapered, have been used with different geometrical combinations. To satisfy industrial demand, different trials have also been carried out for designing optimized fins. The optimization of fins can be performed either by enhancing heat dissipation at an exact fin weight or by diminishing the weight of the fin by precise heat dissipation. Recently a notable amount of work on some typical fins, like, porous fins and perforated fins, has also been carried out. This paper presents a brief review on heat transfer enhancement using fins of different types considering variable thermophysical and geometric parameters, which will also be useful for future use of geometrical modifications of extended surfaces, based on the cost and availability of space.analytical approach, computational approach, experimental approach, perforated fin, porous fin | INTRODUCTIONAdvanced technologies need high-performance heat transfer equipment. Techniques for enhancing the heat transfer rate are classified into two categories: active and passive methods. In the design point of view, active methods are complex as they require some extraneous power input for necessary flow adjustments and to improve the heat transfer rate and thus applications are limited. On the other hand, passive methods require geometrical or surface adjustments to the flow passage by incorporating additional devices. Additionally, by interrupting or varying the existing flow behavior (except for extended surfaces); higher heat transfer coefficients are promoted through this method, which is also followed by an increase in the corresponding pressure drop. The amount of conduction, convection, and radiation of an object shows the amount of heat it transfers. The heat transfer rate is enhanced by increasing the temperature difference between the object and the environment or by enhancing the coefficient of convective heat transfer or by maximizing the surface area of the body. In some cases, it is not appropriate or cost effective to alter the first two options. Introducing a fin to a body, however, expands the surface area and sometimes this is a cost-effective solution for heat transfer problems. Extended surfaces or fins are illustrations of passive methods that are generally used in different industrial applications for the enhancement of heat transfer between the primary surface (heat sink) and the surrounding fluid. Currently reducing the cost and size of fins is the key target of the fin industry. This demand is generally met by the high-thermal-conductivity and costly metals used to fabricate finned surfaces. Many efforts have been made to construct optimized fins. (a) By changing the size and shape of the solid fin: Instead of a longitudinal rectangular solid fin, if the geometry of fin design is changed, the performance parameters and heat tr...

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Turbulence and thermo‐flow behavior of air in a rectangular channel with partially inclined baffles

Salhi¹,

Ajarostaghi

Zarrouk³

et al. 2022

Energy Science & Engineering

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In this paper, the thermal performance improvements of a heat removal system like an electronic system have been analyzed. The studied case is a horizontal channel in which two partially inclined baffles are attached with variable height and number. The channel is crossed by a forced convective flow of a cooling fluid (air). This numerical work evaluates the influences of the height and number of the baffles on the enhancement of the heat transfer rate. The mathematical model of this system is composed of nonlinear partial equations that the analytical solution for them is very complex, hence the need for numerical analysis is mandatory with the aid of a finite volume method. Accordingly, The numerical results are presented in axial and transverse velocity, temperature, local and average Nusselt number, local friction coefficient, pressure drop, heat transfer rate, and turbulence kinetic energy. The results revealed that it is possible to improve the thermal performance of the considered system by adopting designs that allow the maximum heat transfer rate with the minimum energy loss. In addition, results show that at the lowest Reynolds number (Re = 10,000), as the height of baffles rises from 0.01 to 0.03 m (growth by 200%), the heat transfer rate augments about 59.09%. Moreover, at the highest evaluated Reynolds number (Re = 87,300), by increasing the height of baffles up to 200%, the heat transfer rate increases by approximately 50.53%. Furthermore, employing a higher number of baffles leads to more heat transfer rates and a significant pressure drop.

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Laminar forced convection heat transfer from laterally perforated-finned heat sinks

Cited by 36 publications

References 44 publications

Heat Transfer Coefficients in Perforated Fins

Heat Transfer Coefficients in Perforated Fins

Improvement of heat transfer through fins: A brief review of recent developments

Turbulence and thermo‐flow behavior of air in a rectangular channel with partially inclined baffles

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