A new scheme for reducing pressure drop and thermal resistance simultaneously in microchannel heat sinks with wavy porous fins

Lu, Gui; Zhao, Jun; Lin, Lin; Wang, Xiao‐Dong; Yan, Wei‐Mon

doi:10.1016/j.ijheatmasstransfer.2017.04.086

Cited by 123 publications

(32 citation statements)

References 41 publications

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“…In this study, Chebyshev polynomials were applied to demonstrate basis functions on each element whereas nonlinear heat transfer around irregular porous fin was considered to verify the performance of the spectral element method. Lu et al 71 proposed a new scheme to reduce thermal resistance and pressure drop simultaneously in microchannel heat sinks with wavy porous fins (Figure 8). The results showed that the wavy microchannel heat sink with porous fins decreases pressure drop as well as thermal resistance than do the conventional wavy microchannel heat sinks with solid fins.…”

Section: Computational 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: Computational Studiesmentioning

confidence: 99%

“…Microchannel heat sinks with wavy porous fins and its temperature contours 71 [Color figure can be viewed at wileyonlinelibrary.com]…”

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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“…Furthermore, a combination of various structures can be employed to promote the advantages and weaken the disadvantages of a single structure [21][22][23][24]. Ghani et al [22] proposed a novel MCHS with sinusoidal cross-mark cavities and rectangular ribs.…”

Section: Introductionmentioning

confidence: 99%

Parametric Investigation on a Micro-Array Heat Sink with Staggered Trapezoidal Bumps

et al. 2019

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More efficient heat sinks are required due to the rapid increase of power density in microelectronic devices. In this study, a micro-array heat sink with stagger trapezoidal bumps was designed. Numerical simulations for the flow and heat transfer under various conditions were carried out to help us to fully understand the mechanisms of the heat transfer enhancement in such a heat sink. The effects of the structure of the heat sink, parameters of the bumps, and volume fraction of the nanofluid on the performance of heat sink were studied. The results show us that the bumps in the heat sink can result in chaotic convection, interrupting the thermal boundary layer and increasing the cooling area, subsequently improving the heat transfer performance. Furthermore, parametric investigations for trapezoidal bumps were conducted to obtain preferential values for parameters, such as the bump width, fore rake angle of the bump, bump height, and bump pitch.

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“…The wavy surface was selected to augment thermohydraulic performance in the fin-and-tube heat exchangers [17][18][19][20][21][22][23][24][25][26][27][28] and on the channel surface. [29][30][31][32] The numerical and experimental investigations were carried out to analyze the problems.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis and flow visualization in a round tube heat exchanger inserted with wavy V-ribs

Jedsadaratanachai

Boonloi

2017

Advances in Mechanical Engineering

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This article presents thermal performance analysis, flow visualization, and heat transfer characteristic in a round tube heat exchanger inserted with wavy V-rib. The novel design of the wavy V-rib not only allows mass production and simple installation in the heating system but also remains the thermal performance and the heat transfer rate as near as those of the V-baffle design. The numerical investigation with finite volume method is selected to study and describe the mechanisms in the test section. The effects of rib thickness, rib height, and flow direction are considered for the turbulent regime. The numerical results are reported in terms of flow structure and heat transfer behavior. The relationship of the Nusselt number, friction factor, and thermal enhancement factor with various parameters is also concluded. The numerical results reveal that the optimum thermal performance is detected for the wavy V-rib at b/D around 0.1-0.15, while the optimal t/D is around 0.15-0.20 when considered at the simplicity of the wavy V-rib production.

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A new scheme for reducing pressure drop and thermal resistance simultaneously in microchannel heat sinks with wavy porous fins

Cited by 123 publications

References 41 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

Parametric Investigation on a Micro-Array Heat Sink with Staggered Trapezoidal Bumps

Performance analysis and flow visualization in a round tube heat exchanger inserted with wavy V-ribs

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