Constructal heat transfer rate maximization for cylindrical pin-fin heat sinks

Yang, Aibo; Chen, Lingen; Xie, Zhihui; Sun, Fengrui

doi:10.1016/j.applthermaleng.2016.07.150

Cited by 38 publications

(15 citation statements)

References 56 publications

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“…Yang et al 56 constructively optimized the improvement of the rate of heat transfer for cylindrical pin‐fin heat sinks. The outcome of these experiments showed that an optimal diameter with an optimal number of pin fins maximizes the heat transfer rate when the shape of the heat sink with pin fin is fixed.…”

Section: Computational 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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Section: Computational Studiesmentioning

confidence: 99%

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

Maji¹,

Choubey

2020

Heat Trans

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“…1,2,17 It is clear from the literature review that the research has been greatly focused on the theoretical and experimental thermal analysis of both solid fins and porous fins with different profiles and thermophysical properties due to wide range of applications. [3][4][5][6][7][8][9]12,[24][25][26][27][28] By assuming a constant thermal conductivity of the fin material, the dimensionless governing equation for pin fins with power-law type heat transfer coefficients reads 11,15,16,[18][19][20][21]23…”

Section: Preliminaries and Problem Formulationmentioning

confidence: 99%

Exact, analytic temperature distributions of pin fins with constant thermal conductivity and power‐law type heat transfer coefficient

Shivanian

Campo

2017

Heat Trans. Asian Res.

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In this Technical Note, the problem of determining the temperature distribution in a pin fin with power-law heat transfer coefficients is addressed. It is demonstrated that the governing fin equation, a nonlinear second-order differential equation, is exactly solvable for the entire range of the exponent in the power-law heat transfer coefficients. The exact, closed-form analytical solutions in implicit form are convenient for physical interpretation and optimization for maximum heat transfer. Furthermore, it is proved that the exact solutions have three different structures: (1) dual in the range of ≤ −2, (2) unique or dual in the range of −2 < < −1, and (3) unique in the range of ≥ −1. Additionally, exact analytical expressions for the fin efficiency and the fin effectiveness are provided, both as a function of the dimensionless fin parameter for the gamma of under study.

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“…When the temperature was detected, they used an infrared thermal camera. Yang et al [6] studied total heat absorbing bulk, pin material volume and pressure drop. They tried to determine the optimum number of pins for this study.…”

Section: Introductionmentioning

confidence: 99%

Investigation of effects on heat transfer and flow characteristics of Cr-Ni alloy and aluminum pins placed in AISI 304 tube

Berber

Bağırsakçı²,

Gürdal

2020

THERM SCI

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In this study, the effects of cylindrical aluminum and Cr-Ni alloy pins placed in different arrangements on the inner wall of the pipe in the turbulent flow, the effects of heat transfer and flow characteristics on different Reynolds numbers have been experimentally investigated. The experiments were carried out under forced flow and constant heat flow conditions. Air is preferred as the fluid and the fluid velocity is adjusted between Reynolds number of 10000 and 50000. It has been observed that the Nusselt values obtained over the number of Reynolds number for the 5 different test tubes are arranged in a line from large to small, sequential row aluminum pin, sequential row Cr-Ni alloy pin, diagonal row aluminum pin, diagonal row Cr-Ni alloy pin, plain tube. There are also CFD analysis for each material, arrangements and pins geometry sets. On the other hand, it was determined that friction coefficient is directly proportional to the increase of heat transfer coefficient. As a result, it is observed that experimental results are compatible with both literature and numerical study.

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Constructal heat transfer rate maximization for cylindrical pin-fin heat sinks

Cited by 38 publications

References 56 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

Exact, analytic temperature distributions of pin fins with constant thermal conductivity and power‐law type heat transfer coefficient

Investigation of effects on heat transfer and flow characteristics of Cr-Ni alloy and aluminum pins placed in AISI 304 tube

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