An experimental investigation of natural convection heat transfer enhancement from perforated rectangular fins array at different inclinations

Awasarmol, Umesh Vandeorao; Pise, Ashok T.

doi:10.1016/j.expthermflusci.2015.04.008

Cited by 87 publications

(28 citation statements)

References 20 publications

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“…Awasarmol and Pise 37 experimentally investigated natural convection heat transfer enhancement from a perforated rectangular fin array at different inclinations. Steady‐state heat transfer from perforated and solid fin arrays was measured, which is represented in Figure 3.…”

Section: Experimental Studiesmentioning

confidence: 99%

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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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Section: Experimental Studiesmentioning

confidence: 99%

“…Perforated plate fin with variation in perforation size 37 [Color figure can be viewed at wileyonlinelibrary.com]…”

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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“…Meanwhile, the influence of collector inclinations mainly takes into account the incidence angle (optical effects: τα) according to ANSI/ASHRAE 93-2010, 2014 [2]. Awasarmol and Pise [12] studied the natural convection heat transfer from a fin array and angles of inclination. They found a decrease in heat transfer coefficient with the increase in angle of inclination and an optimal angle at 45 • .…”

Section: Introductionmentioning

confidence: 99%

Heat Removal Factor in Flat Plate Solar Collectors: Indoor Test Method

Orlando

Flores-Prieto

2018

Energies

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This paper presents a couple of methods to evaluate the heat removal factor FR of flat plate solar collectors, as well as a parametric study of the FR against the tilt angle β, and (Ti − Ta)/G, and its effects on the a0-factor (FRτα) and the a1-factor (FRULmin). The proposed methods were based on indoor flow calorimetry. The first method considers the ratio of the actual useful heat to the maximum useful heat. The second takes into account the slopes of the family of efficiency curves (FRULmin) according to ANSI/ASHRAE 93-2010, and the minimum overall heat loss coefficient, ULmin. In both methods, a feedback temperature control at collector inclinations from horizontal to vertical allows the inlet temperature and the emulating of the solar radiation to be established by electrical heating. The performance of the methods was determined in terms of the uncertainty of the FR. Method 1 allowed a three-fold improved precision compared to Method 2; however, this implied a more detailed experimental setup. According to the first method, the effects of the tilt angle β, and the (Ti − Ta)/G, on the a0-factor were considerable, since FR is directly proportional to the a0-factor. The changes in (Ti − Ta)/G caused an average change in FR of 32% The FR shows almost linear behavior for inclinations from horizontal to vertical with a 14.5% change. The effects of β on the a1-factor were not considerable, due to the compensation between the increase in FR and the decrease in ULmin as β increased.

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“…Awarsarmol and Pise [35], for example, studied the effect of triangular, rectangular and circular perforations respectively. Awarsarmol and Pise [36] recently carried out an experimental study into the enhancement of natural convection of a perforated fin array with circular perforations of different diameter and angles of inclination, providing useful data for validating numerical methods for porous fins, see e.g. Kundu et al [37].…”

Section: Introductionmentioning

confidence: 99%

A numerical investigation of the thermal-hydraulic characteristics of perforated plate fin heat sinks

Al-Sallami

Al‐damook

Thompson

2017

International Journal of Thermal Sciences

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The benefits of using notch, slot and multiple circular perforations in plate fin heat sinks (PFHSs), are investigated numerically, using a conjugate heat transfer model. Comparisons show that each type of perforation can provide significantly reduced pressure drops over PFHSs but that fins with slot perforations provide the most effective design in terms of heat transfer and pressure drop. The practical benefits of each type of perforated fin for microelectronics cooling is also explored and their capabilities of achieving low processor temperatures for reduced mechanical power consumption are quantified.

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An experimental investigation of natural convection heat transfer enhancement from perforated rectangular fins array at different inclinations

Cited by 87 publications

References 20 publications

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

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

Heat Removal Factor in Flat Plate Solar Collectors: Indoor Test Method

A numerical investigation of the thermal-hydraulic characteristics of perforated plate fin heat sinks

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