Investigation of permeability and porosity effects on the slip velocity and convection heat transfer rate of Fe3O4/water nanofluid flow in a microchannel while its lower half filled by a porous medium

Nojoomizadeh, Mehdi; Karimipour, Arash; Firouzi, Masoumeh; Afrand, Masoud

doi:10.1016/j.ijheatmasstransfer.2017.11.125

Cited by 69 publications

(20 citation statements)

References 73 publications

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“…In many problems, the Nu increases by increasing the NF concentration due to the higher thermal conductivity coefficient and heat transfer. However, in this problem, the Nu and heat transfer rate decrease with an increment in the NF concentration, similar to numerous other problems studied so far [10][11][12]18,20]. The Nu reduction over the NF concentration accretion is more considerable for higher Re values.…”

Section: Nusselt Number In the Microchannel With The Circular Cross-ssupporting

confidence: 83%

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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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Section: Nusselt Number In the Microchannel With The Circular Cross-ssupporting

confidence: 83%

“…One of the most desirable ways of thermal conductivity coefficient enhancement of the base fluid is adding fine solid particles to the base fluid [1][2][3][4][5][6][7][8][9]. It could also be improved using a porous medium in the channel [10][11][12][13][14][15].…”

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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“…Makinde et al [18] investigated the steady MHD nanofluid boundary layer flow over a non-linear stretching sheet. Nojoomizadeh et al [19] numerically investigated the heat transfer and laminar flow with a previous medium. Reddy and Krishna [20] described the unstable flood of the transversely magnetic field of constant strength.…”

Section: Volume 3 Issue 4 2019mentioning

confidence: 99%

MHD Boundary Layer Flow and Heat Transfer of Nano fluid over a Vertical Stretching Sheet in the Presence of a Heat Source

Abbas

Abdal

Hussain

et al. 2019

SIR

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“…They showed that multiphase models have their strengths and weaknesses in predicting nanofluid behaviors. More references on single‐phase and multiphase models can be reviewed here 40‐46 . It should be noted that although the multiphase models have provided accurate results in some investigations, there are still several researchers that continue to implement the single‐phase model in their studies of nanofluids.…”

Section: Introductionmentioning

confidence: 99%

Thermohydraulic and entropy characteristics of Al₂O₃‐water nanofluid in a ribbed interrupted microchannel heat exchanger

et al. 2020

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In this study, an interrupted microchannel heat sink with rib turbulators was studied for its thermohydraulic effectiveness and entropy generation in a compact space. The rib edges are modified to enhance the overall functioning of the system by reducing the pressure drop. The working fluid used was Al2O3‐water nanofluid, and increasing the Reynolds number and nanoparticle concentration triggered a reduction in the heat sink's maximum temperature. These also offer a decrease in resistance to heat transfer, and there is an improvement in the evenness of the temperature of the interrupted microchannel heat sink, as regions with the likelihood of hot spot reduced drastically. At Re = 100, increasing the nanoparticle concentration from 0% to 4% enhanced the heat transfer coefficient by 38.41% for the interrupted microchannel heat sink‐base (IMCH‐B) configuration. Under similar conditions, the convective heat transfer coefficient for the interrupted microchannel heat sink‐fillet (IMCH‐F) increased by 43.69%. Furthermore, at 0.5% concentration, changing the Reynolds number from 100 to 700 augmented the heat transfer coefficient by 70.65%. Thus, the maximum temperature of the substrate's bottom surface was reduced by 53.83°C when the system was operated at Re = 700 and nanoparticle concentration of 4%. The IMCH‐C also showed relatively close results at all observed volume fractions. For the IMCH‐C, the maximum temperature of the bottom surface was reduced by 41.98°C at Re = 700 when compared with Re = 100% and 4% concentration. Although at high Reynolds numbers and concentrations, the pressure drops are higher, the performance enhancement criteria prove that the nanofluid is superior to water and the edge modifications show significant performance improvement. More importantly, the IMCH‐F heat sink showed the optimum performance based on the performance evaluation criteria at Re = 300 and φ=2% (ie, at this point, the heat transfer coefficient is maximum and the pressure drop is minimum). On the other hand, the optimal thermodynamic performance was observed at Re = 700 and φ=4%. The numerical results demonstrated a potential way to exploit nano‐suspensions for thermal applications, especially for high‐energy flux systems with compact space constraints.

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Investigation of permeability and porosity effects on the slip velocity and convection heat transfer rate of Fe3O4/water nanofluid flow in a microchannel while its lower half filled by a porous medium

Cited by 69 publications

References 73 publications

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

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

MHD Boundary Layer Flow and Heat Transfer of Nano fluid over a Vertical Stretching Sheet in the Presence of a Heat Source

Thermohydraulic and entropy characteristics of Al₂O₃‐water nanofluid in a ribbed interrupted microchannel heat exchanger

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Investigation of permeability and porosity effects on the slip velocity and convection heat transfer rate of Fe3O4/water nanofluid flow in a microchannel while its lower half filled by a porous medium

Cited by 69 publications

References 73 publications

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

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

MHD Boundary Layer Flow and Heat Transfer of Nano fluid over a Vertical Stretching Sheet in the Presence of a Heat Source

Thermohydraulic and entropy characteristics of Al2O3‐water nanofluid in a ribbed interrupted microchannel heat exchanger

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Thermohydraulic and entropy characteristics of Al₂O₃‐water nanofluid in a ribbed interrupted microchannel heat exchanger