Fluid flow and heat transfer in microchannel heat sink based on porous fin design concept

Leng, Chuan; Wang, Xiaodong; Wang, Tianhu; Yan, Wei‐Mon

doi:10.1016/j.icheatmasstransfer.2015.04.005

Cited by 150 publications

(30 citation statements)

References 31 publications

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“…Enhancing the thermal efficiency of heat exchangers is a challenging task to meet the heat removal capability needed for development of new devices with better performances. A number of designs and approaches have been proposed to passively enhance the heat transfer performance of cooling devices [1][2][3][4][5][6][7][8][9]. Equipping rectangular channels with vortex generators (VGs) has been demonstrated to be a promising method to passively augment the heat transfer performance [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Laminar convective heat transfer of shear-thinning liquids in rectangular channels with longitudinal vortex generators

Ebrahimi

Naranjani

Milani

et al. 2017

Chemical Engineering Science

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Heat and fluid flow in a rectangular channel heat sink equipped with longitudinal vortex generators have been numerically investigated in the range of Reynolds numbers between 25 and 200. Aqueous solutions of carboxymethyl cellulose (CMC) with different concentrations (200-2000 ppm), which are shear-thinning non-Newtonian liquids, have been utilised as working fluid. Three-dimensional simulations have been performed on a plain channel and a channel with five pairs of vortex generators. The channels have a hydraulic diameter of 8 mm and are heated by constant wall temperature. The vortex generators have been mounted at different angles of attack and locations inside the channel. The shear-thinning liquid flow in rectangular channels with longitudinal vortex generators are described and the mechanisms of heat transfer enhancement are discussed. The results demonstrate a heat transfer enhancement of 39-188% using CMC aqueous solutions in rectangular channels with LVGs with respect to a Newtonian liquid flow (i.e. water). Additionally, it is shown that equipping rectangular Page 2 of 40 channels with LVGs results in an enhancement of 24-135% in heat transfer performance visà-vis plain channel. However, this heat transfer enhancement is associated with larger pressure losses. For the range of parameters studied in this paper, increasing the CMC concentration, the angle of attack of vortex generators and their lateral distances leads to an increase in heat transfer performance. Additionally, heat transfer performance of rectangular channels with longitudinal vortex generators enhances with increasing the Reynolds number in the laminar flow regime.

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Section: Introductionmentioning

confidence: 99%

Laminar convective heat transfer of shear-thinning liquids in rectangular channels with longitudinal vortex generators

Ebrahimi

Naranjani

Milani

et al. 2017

Chemical Engineering Science

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“…The nonlinear ordinary differential equation (12) under the boundary conditions (13) is solved numerically using one of the effective iterative schemes, namely finite difference method. It is linearized by employing Newton's quasilinearization technique that culminates to tridiagonal matrix and solved further using the Thomas algorithm.…”

Section: Numerical Solutionmentioning

confidence: 99%

“…The computations have been accomplished with the assistance of mathematical software MATLAB. The discretized form of Equation (12) and the numerical approximations of the boundary conditions (13) are written as…”

Section: Numerical Solutionmentioning

confidence: 99%

“…Interestingly, Darvishi et al 11 have analyzed the thermal performance of free convection and radiation using a fully wet porous fin. Chuan et al 12 have proposed a model that describes the efficiency of the porous fin with a pressure drop across the microchannel heat sink. A numerical computation is carried out by Baou et al 13 to enhance the performance of vehicle radiator using various porous fin geometries and materials.…”

Section: Introductionmentioning

confidence: 99%

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Thermal performance of straight porous fin with variable thermal conductivity under magnetic field and radiation effects

Madhura

Babitha²,

Kalpana³

et al. 2020

Heat Trans

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The present numerical study reports the thermal performance of the straight porous fin with temperature-dependent thermal conductivity, radiation, and magnetic field effects. The heat transfer model comprising the Darcy's law for simulating flow with solid-fluid interactions in porous medium, Rosseland approximation for heat transfer through radiation, Maxwell equations for magnetic field effect and linearly varying temperature dependent thermal conductivity, results into highly nonlinear ordinary differential equation. The governing equation is solved using a finite difference scheme with suitable boundary conditions. The obtained solutions are physically interpreted by considering the impact of different nondimensional parameters on thermal performance, efficiency, and effectiveness of the system through plotted graphs. A detailed result with regard to the Nusselt number at the fin base is calculated. The results obtained are observed to be in excellent agreement with previous studies. From the study, it is observed that there is a significant effect on the thermal performance of the fin in the presence of porous constraints; also, results reveal that the nonlinear thermal conductivity parameter strengthens the thermal performance, efficiency, and effectiveness of the fin. Furthermore, the results of the study reveal that the rate of heat transfer of the fin increases with the increase in the magnetic parameter and radiation parameter.

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“…The results showed that the porous fin should be placed either in the middle of the vertical hot surface or close to the bottom surface at an angle of 90° to achieve optimum heat transfer. Chuan et al 68 proposed a new porous fin design for heat transfer and fluid flow in a heat sink with a microchannel and noticed that at different coolant flow rates, the reduction of pressure drop was increased to 47.9% with a new design as compared with the conventional heat sink. Moreover, the porous fin parameters significantly influenced the drag reduction efficiency.…”

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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Fluid flow and heat transfer in microchannel heat sink based on porous fin design concept

Cited by 150 publications

References 31 publications

Laminar convective heat transfer of shear-thinning liquids in rectangular channels with longitudinal vortex generators

Laminar convective heat transfer of shear-thinning liquids in rectangular channels with longitudinal vortex generators

Thermal performance of straight porous fin with variable thermal conductivity under magnetic field and radiation effects

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

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