Parametric study on thermal and hydraulic characteristics of laminar flow in microchannel heat sink with fan-shaped ribs on sidewalls – Part 1: Heat transfer

Chai, Lei; Xia, Guodong; Wang, Huasheng

doi:10.1016/j.ijheatmasstransfer.2016.02.077

Cited by 118 publications

(29 citation statements)

References 27 publications

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“…To further check the accuracy and reliability of the numerical model, the numerical results of laminar flow in the microchannel have been performed by comparing with the simulation results from Chai et al as shown in Figures and . Their research was more focused on the performance of the traditional straight microchannel.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Since Tuckerman and Pease first introduced the concept of liquid‐cooled microchannel enhanced heat sinks, a large number of studies were for seeking ways to improve the heat transfer efficiency of microchannel heat sinks. Many experimental and numerical studies were done to improve the performance of microchannels …”

Section: Introductionmentioning

confidence: 99%

“…Many experimental and numerical studies were done to improve the performance of microchannels. [3][4][5][6][7][8][9][10][11] The flow structure found in the nature system could provide ideas for microchannel design. Based on these ideas, Bejan 12 first put forward the concept of microchannel networks.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of hydrodynamic and heat transfer performances of nanofluids in a fractal microchannel heat sink

Yan

2019

Heat Trans. Asian Res.

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Heat transfer and hydrodynamic performances for nanofluids, Al2O3‐water and SiO2‐water, are numerically investigated with different nanoparticles’ volume fractions and the initial velocities in a fractal microchannel heat sink. The fractal microchannel is 100 μm × 100 μm in the inlet cross‐section, and the length at the 0th level is 2000 μm. A constant heat flux of 500 kW/m2 was applied to the bottom wall of the fractal microchannel heat sink. The heat transfer and hydrodynamic performances of different cases are discussed in terms of the mean heat transfer coefficient, mean base temperature, pressure loss, thermal resistance, friction factor f/f0, and COP/COP0. Results indicate that increasing the initial velocity and nanoparticles’ volume fraction lead to an enhanced heat transfer at the expense of pressure loss. Al2O3‐water has a higher mean heat transfer coefficient and pressure drop than that of SiO2‐water, a lower f/f0, mean base temperature, thermal resistance, and COP/COP0. Ultimately, as compared to pure water, the heat transfer coefficients of 4% Al2O3‐water increased by 7.53%, 7.80%, 8.00%, 8.14%, 8.16%, and 8.30%, and the pressure drops increased by 32.09%, 31.41%, 30.81%, 30.05%, 29.21%, and 28.58%, respectively, corresponding to the initial velocities by 4, 5, 6, 7, 8 and 9 m/s.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of hydrodynamic and heat transfer performances of nanofluids in a fractal microchannel heat sink

Yan

2019

Heat Trans. Asian Res.

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“…Thus the Reynolds number and Nusselt number values were compared with existing experimental work. The ANSYS FLUENT simulation is validated with the aid of an existing experimental work of Fan et al [22], Kalteh et al [12], and Chai et al [23]. Figure 6 shows the comparison of the present simulated work and previous experimental work.…”

Section: Validation Of Numerical Simulationmentioning

confidence: 95%

Numerical study of inlet cross-section effect on oblique finned microchannel heat sink

Vinoth¹,

Duraisamy²

2018

THERM SCI

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The current study is focused on the heat transfer and flow characteristics of an oblique finned micro-channel heat sink with different inlet cross-sections. Water and Al 2 O 3 -water nanofluid with 0.25% volume fraction were used as heat transfer fluids. The oblique finned micro-channel heat sinks of size 48 × 80 mm were designed with three different inlet cross-sections, namely square, semicircle and trapezoidal. The ANSYS FLUENT simulations validated with the aid of an existing experimental work. The flow regime in micro-channel heat sink is constrained to laminar flow in the study. The three inlet cross-sections have been investigated by varying Reynolds number for Water and Al 2 O 3 -water nanofluid. The trapezoidal cross-section with average heat transfer rate 3.35% and pressure drop 8.6% is more efficient than other cross-sections due to larger wall area and effective entrance length. The oblique finned micro-channel heat sink with the trapezoidal cross-section is suitable for the micro-electronic cooling systems.

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“…However in the case of triangular cavities, heat transfer enhanced due to formation of vortices in cavities and interruption of boundary-layer which significantly enhanced the convective fluid mixing. Recently Chai et al [34] performed parametric study of fan shaped ribs on side walls for Re ranging from 187-715. They considered entrance effect and viscous heating and observed 6 -101% increase in Nu and 3 -40% decrease in total thermal resistance as compared to smooth one.…”

Section: Introductionmentioning

confidence: 99%

Flow and heat transfer characteristics in convergent-divergent shaped microchannel with ribs and cavities

Srivastava¹,

Dewan²,

Bajpai³

2017

IJHT

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A computational study has been carried out to examine the effects of ribs and cavities on flow and heat transfer in a convergent-divergent shaped microchannel heat sink with constant heat flux for Reynolds number (Re) ranging from 120 to 900. Three-dimensional governing equations were discretized using the finite-volume method. The computational domain included solid silicon and fluid regions. A significant amount of work has been reported in the literature on the individual effects of channel shape and flow disruption using obstacles on thermal performance of microchannels. In the present study convergent-divergent (CD) shaped microchannel with and without ribs and cavities (RC) are considered and their friction coefficient, thermal resistance and maximum substrate temperature are investigated in detail. The present results show that the usage of CD shape with ribs and cavities can reduce the overall thermal resistance up to 40% and make the bottom surface temperature quite uniform. This heat transfer enhancement is mainly due to interruption and redevelopment of boundary-layers along with recirculation zone. The results also show that increasing Re leads to an enhanced heat transfer in terms of increased averaged Nusselt number from 15% to 46%. The combined effect of CD shape with RC is quite effective in heat transfer augmentation but it gradually loses its effectiveness at large values of Re due to a high pressure drop penalty.

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Parametric study on thermal and hydraulic characteristics of laminar flow in microchannel heat sink with fan-shaped ribs on sidewalls – Part 1: Heat transfer

Cited by 118 publications

References 27 publications

Numerical investigation of hydrodynamic and heat transfer performances of nanofluids in a fractal microchannel heat sink

Numerical investigation of hydrodynamic and heat transfer performances of nanofluids in a fractal microchannel heat sink

Numerical study of inlet cross-section effect on oblique finned microchannel heat sink

Flow and heat transfer characteristics in convergent-divergent shaped microchannel with ribs and cavities

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