Hybrid nanofluids with temperature-dependent properties for use in double-layered microchannel heat sink; hydrothermal investigation

Sarvar-Ardeh, Sajjad; Rafee, Roohollah; Rashidi, Saman

doi:10.1016/j.jtice.2021.05.007

Cited by 37 publications

(3 citation statements)

References 39 publications

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“…Where 𝑘 𝑓 is the thermal conductivity of the liquid as adopted by [4] and [5]. 𝑇 𝑤 is the wall temperature at the center of the heated base.…”

Section: Average Nusselt Number Definitionmentioning

confidence: 99%

“…Wei et al [3] conducted experimental and numerical studies on a stacked microchannel heat sink and reported that more uniformity in temperature distribution was observed with the counterflow arrangement of coolant compared with the parallel flow. Sarvar-Ardeh et al [4] adopted a composite nanofluid (Al2O3-SiO2/water and Al2O3-Cu/water) with temperature-dependent properties in a double-layered microchannel. They reported that Al2O3-SiO2/water had better thermal performance than Al2O3-Cu/water.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of the Thermal-Hydraulic Performance of Water-Based Al2O3 - Cu Hybrid Nanofluids in a Double-Layer Microchannel Heat Sink

Oluwasegun¹,

Omosehin²,

Adelaja³

et al. 2022

Preprint

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In this work, a numerical study is conducted to investigate the effects of hybrid nanofluid (Al2O3-Cu/water) on the thermal and hydraulic performance of a three-dimensional double-layer counterflow microchannel heat sink. The heat sink comprises a silicon block to which a constant heat flux of q = 1.0 MW/m 2 is applied at the base. Different volume concentrations of alumina and copper nanoparticles are considered, with the Reynolds number varying between 200 and 1000. The conjugate heat transfer problem is solved numerically using the two-phase Eulerian-Eulerian model in ANSYS -Fluent environment. Experimental validation shows a good agreement between the numerical models and the experiment. Nanofluids exhibit higher heat transfer coefficients and pressure drops than the base fluid; however, nanoparticle hybridization has a minimal effect on the pressure drop.

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“…Where 𝑘 𝑓 is the thermal conductivity of the liquid as adopted by [4] and [5]. 𝑇 𝑤 is the wall temperature at the center of the heated base.…”

Section: Average Nusselt Number Definitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Thermal-Hydraulic Performance of Water-Based Al2O3 - Cu Hybrid Nanofluids in a Double-Layer Microchannel Heat Sink

Oluwasegun¹,

Omosehin²,

Adelaja³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…In addition, with raising the volumetric fraction of nanoparticles, the friction coefficient and consequently the pumping power increase. 16,17 In a numerical simulation, Sarvar-ardeh et al 18 studied the effect of using hybrid nanofluids on the performance of silicon double-layer microchannels. They checked the cases with the constant Re numbers and constant flow rates to show the effect of the nanoparticles volume concentration on the base temperature.…”

mentioning

confidence: 99%

Heat transfer and entropy generation of hybrid nanofluid inside the convergent double‐layer tapered microchannel

Sarvar-Ardeh

Rafee

Rashidi

2022

Math Methods in App Sciences

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When designing microscale heat exchangers, the reduction of energy dissipation and improved system performance in terms of heat transfer and fluid flow should be considered. Some methods, such as the use of nanofluids and convergent walls in the microchannel heat sinks, can be helpful. In this study, the hydrothermal performance and entropy generation of alumina‐silica/water hybrid nanofluid in the double‐layer tapered microchannel are investigated using the three‐dimensional simulation. The flow Re number and the volumetric fraction of the nanoparticles vary in the ranges of 50 to 400 and 0% to 5%, respectively. Numerical results show that by using the convergent microchannel, in addition to decreasing the maximum base surface temperature, the temperature gradient also becomes more uniform. Boosting the volumetric fraction of nanoparticles and decreasing the tapered factor (TF) reduce the thermal resistance of the system but cause higher pumping powers. At Re = 400 and φ = 5%, when the convergence factor of the channel reduces from 1 to 0.4, pumping power will increase 149% but the thermal resistance reduction about 12%. At lower Re numbers, the effects of channel convergence on enhancing the mean Nu number are greater than the cases with higher Re numbers. In general, boosting the convergence of the channel increases the frictional entropy generation and diminishes the thermal entropy generation. At Re = 200 and φ = 5%, by decreasing the tapered ratio from TF = 1 to TF = 0.4, the frictional entropy generation will double and the thermal entropy generation will reduce by 7.9%.

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Performance enhancement in double-layer tapered microchannels by changing the wall hydrophobicity and working fluid

Sarvar-Ardeh

Rafee

Rashidi

2022

J Therm Anal Calorim

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Hybrid nanofluids with temperature-dependent properties for use in double-layered microchannel heat sink; hydrothermal investigation

Cited by 37 publications

References 39 publications

Numerical Study of the Thermal-Hydraulic Performance of Water-Based Al2O3 - Cu Hybrid Nanofluids in a Double-Layer Microchannel Heat Sink

Numerical Study of the Thermal-Hydraulic Performance of Water-Based Al2O3 - Cu Hybrid Nanofluids in a Double-Layer Microchannel Heat Sink

Heat transfer and entropy generation of hybrid nanofluid inside the convergent double‐layer tapered microchannel

Performance enhancement in double-layer tapered microchannels by changing the wall hydrophobicity and working fluid

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