Numerical study on the use of shear-thinning nanofluids in a micro pin-fin heat sink including vortex generators and changes in pin shapes

Aguirre, I.; González, Amaru; Castillo, Ernesto

doi:10.1016/j.jtice.2022.104400

Cited by 17 publications

(5 citation statements)

References 53 publications

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“…They modified the single-phase expression of thermophysical properties in numerical simulations to make it suitable for hybrid nanofluids and used apparent viscosity contour lines to assess the thermal and hydraulic efficiency of nanofluids. Based on their previous experimental data [107], they compared the heat transfer effects of the water-ethylene glycol mixture-based Al2O3 and multi-walled carbon nanotube nanofluids at Reynolds numbers of 200-1200 through numerical simulations. They found that an increase in pin density can lead to an enhancement in heat transfer rate and hydraulic loss, as well as a risk of thermal blocking.…”

Section: Simulations and Theoretical Studies Of Liquid Cooling With N...mentioning

confidence: 99%

The Applications and Challenges of Nanofluids as Coolants in Data Centers: A Review

Sun,

Geng,

Dong

et al. 2024

Energies

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With the rapid development of artificial intelligence, cloud computing and other technologies, data centers have become vital facilities. In the construction and operation of data centers, how to effectively solve the problem of cooling and energy saving is the key problem. In this review article, a critical review of recent research regarding the application of nanofluids in data center cooling are put forward. Many different aspects of nanofluids such as the classification of nanoparticles, base fluid components, and types and structures of heat exchangers were discussed. Furthermore, some advanced and up-to-date apparatus and theoretical models of utilizing nanofluids as coolants in data centers are reviewed and described in detail. Lastly, but not least, potential research directions in the future and the challenges faced by the researchers and industry in this field are proposed and discussed. In conclusion, nanofluids used as novel heat exchange medium, which has been widely proven in other areas, can also conspicuously improve data center cooling technology in the future.

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Section: Simulations and Theoretical Studies Of Liquid Cooling With N...mentioning

confidence: 99%

The Applications and Challenges of Nanofluids as Coolants in Data Centers: A Review

Sun,

Geng,

Dong

et al. 2024

Energies

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“…The simulations were performed in three dimensions with large-scale meshes without considering symmetry. Results show that the addition of vortex generators increased the heat transfer rates significantly (by more than 20%) with a considerable increase in pressure drops in the Newtonian fluid [50]. Moreover, the lack of researches on nanofluids with turbulent flow, effective Prandtl number, dimensionless pressure (Eu number), pumping power and profit factor in mini-channels and micro-channels, as well as the comparison of different turbulent flow nanofluids with each other and their effects on the cooling of electronic components, has created the motivation for the present study.…”

Section: Introductionmentioning

confidence: 98%

“…Furthermore, optimum values of the fin density at which the minimum irreversibility happens [49]. Aguirre et al (2022) numerically studied the use of water and two hybrid shear-thinning nanofluids in a microchannel heat sink. The simulations were performed in three dimensions with large-scale meshes without considering symmetry.…”

Section: Introductionmentioning

confidence: 99%

Fluid flow and heat transfer of water based-nanofluids in plate- fin heat Sink

Rahbar,

Shotorbani,

Bazyar

et al. 2023

Preprint

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Heat transfer is generally needed in industrial processes and consumer products. To improve efficiency and to increase power density per unit surface and volume, new materials such as nanofluid have been developed for improving heat transfer systems. Nanofluid consisting of nanoparticles dispersed in a base fluid provides improved heat transfer capability. The use of passive strategies in microchannel heat sinks allows for increasing the device’s efficiency. In this study, the fluid flow and heat transfer characteristics of turbulent nanofluids flow in plate- fin heat sink (PFHS) such as base surface temperature, local Nusselt number, dimensionless pressure (Eu number), pumping power, profit factor, thermal resistance and effective Prandtl number are studied. Using the K-Ɛ turbulence model, the characteristics of the fluid flow through the PFHS are described and simulated by Ansys Fluent. A constant heat flux boundary condition is applied on the base plate of PFHS and all the other surfaces of PFHS are insulated. Four different kinds of nanofluids are utilized as working fluids which are SiO2, Al2O3, ZnO, and CuO dispersed in distilled water as a base fluid. Volume fractions of 2% and a distinctive nanoparticle diameter of 60 nm were employed. Results indicate that nanofluids can improve the performance of PFHS. Viscosity has an important role in the pressure drop in the PFHS. The improvement in the thermal transportation of nanofluids increases the convective heat transfer coefficient.

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“…It possesses a power-law index that is less than one. 54 Conversely, a dilatant fluid, often referred to as a shear-thickening fluid, witnesses a rise in viscosity as the strain rate rises. It showcases a power-law index that exceeds one.…”

Section: Introductionmentioning

confidence: 99%

“…A pseudoplastic fluid, also known as a shear‐thinning fluid, experiences a decline in viscosity as the strain rate increases. It possesses a power‐law index that is less than one 54 . Conversely, a dilatant fluid, often referred to as a shear‐thickening fluid, witnesses a rise in viscosity as the strain rate rises.…”

Section: Introductionmentioning

confidence: 99%

Modulating fluid rheology and confinement toward augmenting the performance of a double layered microchannel heat sink

Kumar,

Das,

Bakli

2024

Heat Trans

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The improvement of the cooling performance of liquid‐cooled microchannel heat sinks used for densely packed electronic circuits is sorted via passive techniques like tuning substrate or coolant properties. We propose a design for enhancing heat sink performance by simulataneously modifying the channel geometry and tuning the fluid rheology. By modeling the coolant as a power law fluid, its rheological behavior is varied ranging from shear‐thinning to shear‐thickening, alongside Newtonian fluid. We introduced tapering to the middle wall that separates the bottom and top channels of a double layered microchannel heat sink (DL‐MCHS), causing both channels to converge. This convergence not only increases the flow velocity within the downstream microchannel but also reduces the apparent viscosity of the shear‐thinning fluid being subjected to shear, resulting in enhanced thermal and hydraulic performance. We analyze the results from both the first and the second law of thermodynamics context, demonstrating that a tapered DL‐MCHS with shear‐thinning fluid outperforms a straight partition wall DL‐MCHS with Newtonian coolant. However, we also discovered that extreme tapering compromises thermodynamic viability, but by fine‐tuning the extent of tapering, we inferred that a DL‐MCHS with shear‐thinning fluid can become viable with little compromise in the thermal performance.

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Numerical study on the use of shear-thinning nanofluids in a micro pin-fin heat sink including vortex generators and changes in pin shapes

Cited by 17 publications

References 53 publications

The Applications and Challenges of Nanofluids as Coolants in Data Centers: A Review

The Applications and Challenges of Nanofluids as Coolants in Data Centers: A Review

Fluid flow and heat transfer of water based-nanofluids in plate- fin heat Sink

Modulating fluid rheology and confinement toward augmenting the performance of a double layered microchannel heat sink

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