Numerical simulation of heat transfer in a micro channel heat sinks using nanofluids

Farsad, E.; Abbasi, Seyed Peyman; Zabihi, Majed; Sabbaghzadeh, J.

doi:10.1007/s00231-010-0735-y

Cited by 45 publications

(18 citation statements)

References 18 publications

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“…Among the cooling methods, microchannel heat sink has proved to be a high-performance cooling method. 2 Significant development of micro-manufacturing methods in the past decade has made microchannel reactors able to have different practical applications in several fields. Due to business benefits and practical applications of the current discussion, many studies have been carried out by researchers in this field.…”

Section: Introductionmentioning

confidence: 99%

Impact of ribs on flow parameters and laminar heat transfer of water–aluminum oxide nanofluid with different nanoparticle volume fractions in a three-dimensional rectangular microchannel

Akbari

Toghraie

Karimipour

2015

Advances in Mechanical Engineering

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This article aims to study the impact of ribs on flow parameters and laminar heat transfer of water-aluminum oxide nanofluid with different nanoparticle volume fractions in a three-dimensional rectangular microchannel. To this aim, compulsory convection heat transfer of water-aluminum oxide nanofluid in a rib-roughened microchannel has been numerically studied. The results of this simulation for rib-roughened three-dimensional microchannel have been evaluated in contrast to the smooth (unribbed) three-dimensional microchannel with identical geometrical and heat-fluid boundary conditions. Numerical simulation is performed for different nanoparticle volume fractions for Reynolds numbers of 10 and 100. Cold fluid entering the microchannel is heated in order to apply constant flux to external surface of the microchannel walls and then leaves it. Given the results, the fluid has a higher heat transfer with a hot wall in surfaces with ribs rather than in smooth ones. As Reynolds number, number of ribs, and nanoparticle volume fractions increase, more temperature increase happens in fluid in exit intersection of the microchannel. By investigating Nusselt number and friction factor, it is observed that increase in nanoparticle volume fractions causes nanofluid heat transfer properties to have a higher heat transfer and friction factor compared to the base fluid used in cooling due to an increase in viscosity.

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Section: Introductionmentioning

confidence: 99%

Impact of ribs on flow parameters and laminar heat transfer of water–aluminum oxide nanofluid with different nanoparticle volume fractions in a three-dimensional rectangular microchannel

Akbari

Toghraie

Karimipour

2015

Advances in Mechanical Engineering

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“…Manay et al [27], in 2012, numerically Investigated heat transfer characteristics and compared with experimental data and concluded that Mixture model theory can be applied to nanofluids flow and heat transfer enhancement was 2.87 and 3.21 times for Al2O3 and CuO respectively. Farsad et al [28], in 2011, did the numerical simulation of microchannels and concluded that Heat transfer increases with increases with increase in concentration and metals have higher thermal conductivity than corresponding oxides. Mohammed et al [29], in 2011, did experiments on diamond , Al2O3, Ag, CuO, TiO2, SiO2 in triangular microchannels and found out that Diamond has highest heat transfer coefficient and alumina with lowest , SiO2-H2O has highest pressure drop, Ag-H2O shows no wall shear stress.…”

Section: B History and Literaturementioning

confidence: 99%

Study of Heat Transfer of Aluminium Oxide Nanofluids using Aluminium Split Flow Microchannels

Saini¹,

Sharma²,

Gangacharyulu³

et al. 2016

IJERT

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Experimental investigations were performed on Al2O3-H2O nanofluids using split flow type microchannels with particle volume fractions of 0, 0.1%, 0.25%, 0.5% (vol.) with the flow rate ranging from 0.5ml/min to 2.0ml/min. The effect of Prandtl number and Reynolds number is also studied. Experimental results show that thermal conductivity increases and viscosity decreases with increase in temperature. Thermal conductivity and viscosity increases with increase in concentration of nanofluids. Heat transfer coefficient, Prandtl number. It is seen that heat transfer coefficient and Prandtl number increases with increase in concentration of particles whereas Reynolds number decreases with increase in concentration. The heat transfer coefficient increased by maximum of 27% for 0.5% (vol.) concentration and Prandtl number increased by 22% maximum. However Reynolds number had decreased by maximum of 28% for 0.5ml/min flow rate and least decrease by 18% for 2ml/min flow rate.

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“…Effective viscosity of nanofluid is given by Einstein equation as suggested for particle in volume fractions less than 5.0 vol.% and is defined [15]: Where subscript f, p, nf are correspond to fluid, particle and nanofluids respectively. Nanoparticle shape factor, n, was assumed to be 3 for spherical particles as tabulated in Table II.…”

Section: Methodsmentioning

confidence: 99%

Performance Analysis of Electronics Cooling using Nanofluids in Microchannel Heat Sink

Fesal¹,

SyazwaniIlmin²,

Gani³

2016

IJET

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Abstract-Performance analysis of thermal enhancement for cooled microchannel heat sink (MCHS) using nanofluidsmathematical formulation was investigated and presented in this paper. Heat transfer capability in terms of thermal conductivity, heat transfer coefficient, thermal resistance, heat flux and required pumping power were evaluated on the effectiveness of copper oxide (CuO), silicon dioxide (SiO 2 ) and titanium dioxide (TiO 2 ) with water as a base fluid. The results showed that thermal performance augmented by 12.2% in thermal conductivity at particle volume fraction of 4% to CuO-water nanofluid, 11.8% for SiO 2 -water and 10.0% for TiO 2 -water. The maximum heat transfer coefficient enhances of 12.4% for CuO, SiO 2 is 8. In the last three decades, the emergence of nanotechnologyis rapidly approaching, were utilized to improve the heat transfer rate to apply on the electronicdevices in order to reach a satisfactory level of thermal efficiency. The heat transfer rate can passively be improved by changing the geometry's flow, boundary conditions or by improving thermo physical properties such as increasing the thermal conductivity of fluid [1]. To meet the high dissipation rate requirements and maintain a low junction temperature in electronic devices, many cooling technologies have been pursued. Among of these, the microchannel heat sink (MCHS) was introduced because of its ability to produce high heat transfer coefficient, small size and volume per heat load and small coolant requirements [2].Working fluids was applied to enhance the heat transfer by changing the fluid transport properties and flow features in MCHS. Recently, this concept has focused on heat transfer enhancement by using a nanofluid that has a nanoscale metallic or non-metallic particles in the base fluids.Besides, nanofluids has become a concern because they display higher potential as heat transfer fluid than normally utilized base fluids and micron sized particle-fluids. This is due to clogging in pumping and flow apparatus which is caused by rapid settling of the micron sized particle. Nanofluids do not indicate this behavior. This makes nanofluids a better choice as heat transfer fluid [3]. Nanofluids (1-100nm-size particles), often called as ultra-fine solid particles, engineered colloidal suspension, are stable and prepared by dispersing a certain percentage of nanoparticles in base fluids [4][5][6].The factors that causes heat transfer enhancement are solid particles and host fluids chemical composition, size, shape and concentration of nanoscale particles, thermal condition and surfactants. Some of these factors also affect the stability of the nanofluids. There are three strategies to attain good stability, namely addition of surfactants, pH control and ultrasonification [7]. From the literature, heat transfer coefficient depends on Reynolds number, volume fraction of the nanofluids (concentration), temperature, base-fluid

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Numerical simulation of heat transfer in a micro channel heat sinks using nanofluids

Cited by 45 publications

References 18 publications

Impact of ribs on flow parameters and laminar heat transfer of water–aluminum oxide nanofluid with different nanoparticle volume fractions in a three-dimensional rectangular microchannel

Impact of ribs on flow parameters and laminar heat transfer of water–aluminum oxide nanofluid with different nanoparticle volume fractions in a three-dimensional rectangular microchannel

Study of Heat Transfer of Aluminium Oxide Nanofluids using Aluminium Split Flow Microchannels

Performance Analysis of Electronics Cooling using Nanofluids in Microchannel Heat Sink

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