Performance enhancement of the double-layered micro-channel heat sink by use of tapered channels

Osanloo, Behzad; Mohammadi-Ahmar, Akbar; Solati, Ali; Baghani, Mostafa

doi:10.1016/j.applthermaleng.2016.04.073

Cited by 70 publications

(14 citation statements)

References 34 publications

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“…The study found that the TPs had superior heat transfer performance with and without PCMs. The thermal‐hydraulic features of micro heat sinks with convergence double‐layers channel have been investigated by Osanloo et al using the water flow rate. The data showed that the ratio of thermal resistance and wall temperature gradient reduce, while the thermal performance of micro heat sinks enhances with an increase in the channel convergence angle and the flow rate of water as the volume of the heat sink is constant.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional computational comparison of mini pinned heat sinks using different nanofluids: Part one—the hydraulic‐thermal characteristics

Al‐damook

Alfellag

Khalil

2019

Heat Trans. Asian Res.

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The hydraulic-thermal characteristics of 3D pinned heat sink designs have been numerically compared as the first part of a three-part investigation. Five different pin geometries (circular, square, triangular, strip, and elliptic pins) and an unpinned heat sink with three types of nanofluids (Al 2 O 3 -H 2 O, SiO 2 -H 2 O, and CuO-H 2 O) are considered for laminar forced convection. The range of Reynolds number is from 100 to 1000, and volume fractions vary between 0% and 5%.The finite volume method is employed to solve the Navier-Stokes and energy equations by employing a SIMPLE algorithm for a computational solution. Three parameters are presented-the Nusselt number, the bottom temperature, and the hydrothermal performance of the heat sink with pressure drop data. The findings indicated that the overall hydrothermal performance of elliptic-pinned (EP) heat sinks produces the most substantial value of 3.10 for pure water. For different nanofluids, the SiO 2 -water nanofluids with EPs have the most significant hydrothermal performance. Also, this factor is enhanced with an increase in nanofluid concentration up to nearly 3.34 for 5% of SiO 2 -water. Consequently, applying the elliptic-pinned heat sinks is recommended with pure water for considering an increase in the pressure drop, with 5% of SiO 2 -water nanofluids, regardless of an enlargement of pressure drop for heat-dissipation applications. K E Y W O R D Scooling rate enhancements, hydrothermal performance augmentation, pinned heat sinks, using different nanofluids 1 | INTRODUCTION Many cooling techniques have been suggested for improving the hydraulic-thermal performance of macro, mini, and micro heat sinks to overcome the main challenge of electronic cooling systems with a high density of heat generation. The improvement in the hydraulic thermal design of heat sink leads to a reduction in its size and weight and enhances the cooling rate; thereby, avoiding failure and increasing the reliability and speed performance of engineering devices. 1 Therefore, pinned heat sinks are one of the most common techniques used to improve the thermo-hydraulic performance of heat sinks because heat sinks with pins are applied in the liquid and gas processes of many engineering applications. Pinned heat sinks are proposed as a cooling technique with water and nanofluids to enhance the cooling performance of heat sinks. 1-3 Thus, many researchers have investigated different kinds of heat sinks with various fluid types to overcome the issue of rapidly developing heat generated in electronic systems and their applications for protecting these systems from damage.Many numerical studies on heat sinks with pins using liquid cooling have been performed. For example, Ambreen et al 4 reported the hydrothermal characteristics of circular micro-pinned heat sinks with Al 2 O 3 -H 2 O nanofluids (0.25%-1%) using the Lagrangian-Eulerian approach. The results showed that the hydrothermal performance was enhanced upon using nanofluids with an increase in volume fraction instead of pure wa...

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Section: Introductionmentioning

confidence: 99%

Three‐dimensional computational comparison of mini pinned heat sinks using different nanofluids: Part one—the hydraulic‐thermal characteristics

Al‐damook

Alfellag

Khalil

2019

Heat Trans. Asian Res.

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“…The multilayered design is more efficient than the single layer design. Osanloo et al [12] numerically perceive the performance of a DLMCHS with both lower and upper channel tapered. They validated the results with those attain from the literature.…”

Section: Introductionmentioning

confidence: 99%

Application of a Double Layer Circular Microchannel Heat Sink in Electronic Industry

Narayanan*¹,

Kamath²

2019

IJITEE

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The present paper is focused to evaluate the pressure drop and heat transfer performance of a double layer circular microchannel heat sink with numerically and experimentally. Numerical analysis is carried for various mass flow rates, with turbulent condition used in the ANSYS Fluent for two flow arrangements. The experiment is carried out by varying the mass flow rate ranges 3.32x10-4 kg/s to 27.72x10-4 kg/s with water as the cooling medium. The effect of a parallel flow and counter flow arrangements on heat transfer and flow parameters is studied for a constant heat input of 80W. The numerical result is nearly the same with the measured values. The pressure drop increases with the mass flow rate. The heat transfer enhancement is evaluated by the wall surface temperature and temperature uniformity. Even though parallel and counter flow arrangement has similar flow and thermal behavior, the latter has better temperature uniformity in the base of the heat sink for all pumping powers.

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“…It was found that the streamwise temperature rise was substantially reduced for DL-MCHS and that the pressure drop was also smaller than that of SL-MCHS. Motivated by these promising results, extensive studies have been subsequently conducted to explore the thermal and fluid properties of DL-MCHS [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. Early studies mainly focused on the effectiveness verification of the DL-MCHS design.…”

Section: Introductionmentioning

confidence: 99%

“…Such new designs of DL-MCHS have been found to reduce thermal resistance and pumping power considerably. Osanloo et al [ 19 ] and Wong et al [ 20 ] developed DL-MCHS with tapered microchannels or channel contraction. Higher thermal performance was achieved for such improved DL-MCHS as compared to that with the conventional design of straight channels, but pumping power was increased.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Double-Layered Microchannel Heat Sinks with Different Cross-Sectional Shapes

Deng

Zhang

et al. 2018

Entropy

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This work numerically studies the thermal and hydraulic performance of double-layered microchannel heat sinks (DL-MCHS) for their application in the cooling of high heat flux microelectronic devices. The superiority of double-layered microchannel heat sinks was assessed by a comparison with a single-layered microchannel heat sink (SL-MCHS) with the same triangular microchannels. Five DL-MCHSs with different cross-sectional shapes—triangular, rectangular, trapezoidal, circular and reentrant Ω-shaped—were explored and compared. The results showed that DL-MCHS decreased wall temperatures and thermal resistance considerably, induced much more uniform wall temperature distribution, and reduced the pressure drop and pumping power in comparison with SL-MCHS. The DL-MCHS with trapezoidal microchannels performed the worst with regard to thermal resistance, pressure drop, and pumping power. The DL-MCHS with rectangular microchannels produced the best overall thermal performance and seemed to be the optimum when thermal performance was the prime concern. Nevertheless, the DL-MCHS with reentrant Ω-shaped microchannels should be selected when pumping power consumption was the most important consideration.

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Performance enhancement of the double-layered micro-channel heat sink by use of tapered channels

Cited by 70 publications

References 34 publications

Three‐dimensional computational comparison of mini pinned heat sinks using different nanofluids: Part one—the hydraulic‐thermal characteristics

Three‐dimensional computational comparison of mini pinned heat sinks using different nanofluids: Part one—the hydraulic‐thermal characteristics

Application of a Double Layer Circular Microchannel Heat Sink in Electronic Industry

Numerical Study of Double-Layered Microchannel Heat Sinks with Different Cross-Sectional Shapes

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