Investigation of rib's height effect on heat transfer and flow parameters of laminar water–Al 2 O 3 nanofluid in a rib-microchannel

Akbari, Omid Ali; Toghraie, Davood; Karimipour, Arash; Safaei, Mohammad Reza; Goodarzi, Marjan; Alipour, Habibollah; Dahari, Mahidzal

doi:10.1016/j.amc.2016.05.053

Cited by 163 publications

(57 citation statements)

References 48 publications

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“…Usually, a nanofluid is composed of water (an ordinary fluid) mixed with nano-sized solid particles with high conductivity, which improves the thermal conductance properties of the fluid. It has been shown that nanofluids can potentially have a higher heat transfer coefficient, which results in a decrease in the size of thermal energy systems [5][6][7][8]. Over two decades of research and development, various types of nanomaterials, such as Al 2 O 3 , CuO, MgO, and Fe 3 O 4 , and different kind of base fluids, such as water, engine oil, ethylene glycol, therminol 66, have been experimented on.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Iron Oxide (III)–Therminol 66 Nanofluid as a Novel Working Fluid in a Convective Radiator Heating System for Buildings

et al. 2019

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This work investigates the use of iron oxide (III)–therminol 66 oil-based nanosuspensions in a convective heating system with potential heating applications in the buildings sector. In an experimental study, characteristics of nanofluids were measured, including heat capacity, thermal conductivity, and density. The influences of mass flow rate and concentration of nanofluid on various parameters were quantified, such as pressure loss, friction coefficient, and heat transfer rate. For a concentration of 0.3 wt.%, the heat transfer increased by 46.3% and the pressure drop increased by 37.5%. The latter is due to the higher friction and viscosity of the bulk of the nanofluid. Although the pressure drop is higher, the thermo-hydraulic efficiency still increased by 19%. As a result, iron oxide (III)–therminol 66 presented reasonable thermal performance, higher heat transfer coefficient, and a lower pressure drop value (19% better performance in comparison with water) for the air–liquid convective system. Results also showed that for nanosuspensions at 0.3 wt.%, the friction factor of the system increased by 10% in comparison with the performance of the system with water.

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Section: Introductionmentioning

confidence: 99%

Assessment of Iron Oxide (III)–Therminol 66 Nanofluid as a Novel Working Fluid in a Convective Radiator Heating System for Buildings

et al. 2019

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“…Ali Akbari et al [23] conducted a numerical study on the influence of the ribs height on the heat transfer and water-aluminum oxide NF flow in a microchannel. Their results demonstrated that the tooth height and the concentration have a direct influence on the friction coefficient and Nu ave .…”

Section: Introductionmentioning

confidence: 99%

“…From the studies reviewed on microchannels [22][23][24][25][26][27][28][29][30][31][32][33], it can be concluded that the use of microchannels, due to the increasing need of different industries for small and efficient heat exchangers, is considered to be more than before. Therefore, the behavior of microchannels in different environments needs to be given more attention.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Nanoparticle Shape and Microchannel Geometry on Fluid Flow and Heat Transfer in a Porous Microchannel

2020

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Microchannels are widely used in electrical and medical industries to improve the heat transfer of the cooling devices. In this paper, the fluid flow and heat transfer of water–Al2O3 nanofluids (NF) were numerically investigated considering the nanoparticle shape and different cross-sections of a porous microchannel. Spherical, cubic, and cylindrical shapes of the nanoparticle as well as circular, square, and triangular cross-sections of the microchannel were considered in the simulation. The finite volume method and the SIMPLE algorithm have been employed to solve the conservation equations numerically, and the k-ε turbulence model has been used to simulate the turbulence fluid flow. The models were simulated at Reynolds number ranging from 3000 to 9000, the nanoparticle volume fraction ranging from 1 to 3, and a porosity coefficient of 0.7. The results indicate that the average Nusselt number (Nuave) increases and the friction coefficient decreases with an increment in the Re for all cases. In addition, the rate of heat transfer in microchannels with triangular and circular cross-sections is reduced with growing Re values and concentration. The spherical nanoparticle leads to maximum heat transfer in the circular and triangular cross-sections. The heat transfer growth for these two cases are about 102.5% and 162.7%, respectively, which were obtained at a Reynolds number and concentration of 9000 and 3%, respectively. However, in the square cross-section, the maximum heat transfer increment was obtained using cylindrical nanoparticles, and it is equal to 80.2%.

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“…It was found that the heat transfer rate, the friction coefficient and the average Nusselt number increase with increasing nanoparticles volume fraction and ribs heights. Karimipour [12] conducted a numerical study on nanofluid forced convection in microchannel. It was showed that increasing the Reynolds number and nanopartilces volume fraction enhances the heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Cooling a Ribbed Microchannel Using Nanofluid

Madani¹

2018

Journal of Thermal Engineering

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A 2-D numerical investigation was carried out to study the effect of spacing between ribs on nanofluid flow and heat transfer inside a horizontal micro-channel. Two identical ribs were placed at the lower wall of micro-channel with variable spacing between them. The alumina oxide nanoparticles was suspended in water as based fluid at different volume fraction 0, 2 and 4%. The finite volume method was used to solve the continuity, momentum and energy equations. The effects of different parameters such as nanoparticles volume fraction, Reynolds number, and the spacing between ribs has been evaluated. The results showed that increasing nanoparticles volume fraction and Reynolds number significantly enhanced the heat transfer and the Poiseuille number. The presence of ribs improves the heat transfer. However, increasing the spacing between ribs leads to decrease the heat transfer rate.

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Investigation of rib's height effect on heat transfer and flow parameters of laminar water–Al 2 O 3 nanofluid in a rib-microchannel

Cited by 163 publications

References 48 publications

Assessment of Iron Oxide (III)–Therminol 66 Nanofluid as a Novel Working Fluid in a Convective Radiator Heating System for Buildings

Assessment of Iron Oxide (III)–Therminol 66 Nanofluid as a Novel Working Fluid in a Convective Radiator Heating System for Buildings

The Effect of Nanoparticle Shape and Microchannel Geometry on Fluid Flow and Heat Transfer in a Porous Microchannel

Numerical Investigation of Cooling a Ribbed Microchannel Using Nanofluid

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