Entropy generation due to natural convection of a nanofluid in a partially open triangular cavity

Bondareva, Nadezhda S.; Sheremet, Mikhail А.; Öztop, Hakan F.; Abu‐Hamdeh, Nidal H.

doi:10.1016/j.apt.2016.09.030

Cited by 104 publications

(41 citation statements)

References 45 publications

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“…In the thermal system under investigation here, the entropy generation is due to heat transfer over a finite temperature difference and viscous dissipation [26,40]. Following the methodology utilized in several previous second law analyses [41,42], the local entropy generation rate of the nanofluid flow can be written as:…”

Section: Entropy Generationmentioning

confidence: 99%

The effect of Al 2 O 3 -water nanofluid on the heat transfer and entropy generation of laminar forced convection through isotropic porous media

Torabi

Ghiaasiaan

et al. 2017

International Journal of Heat and Mass Transfer

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Section: Entropy Generationmentioning

confidence: 99%

The effect of Al 2 O 3 -water nanofluid on the heat transfer and entropy generation of laminar forced convection through isotropic porous media

Torabi

Ghiaasiaan

et al. 2017

International Journal of Heat and Mass Transfer

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“…Moreover, using the single-phase model with experimentally-based correlations for physical properties is more effective in comparison with two-phase nanoliquid models and experimental data [22,23]. Using the Boussinesq approach, the basic equations managing these phenomena can be formulated in dimensional form as [24]: Using the Boussinesq approach, the basic equations managing these phenomena can be formulated in dimensional form as [24]:…”

Section: Mathematical Modelmentioning

confidence: 99%

Thermal Convection of Nanoliquid in a Double-Connected Chamber

2020

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Thermogravitational convective thermal transmission, inside a square differentially-heated chamber with a nanoliquid, has been examined in the presence of internal adiabatic or a thermally-conducting solid body. A single-phase nanoliquid approach is employed, based on the experimentally-extracted relations for nanofluid heat conductivity and dynamic viscosity. The governing equations have been written using non-primitive parameters such as stream function and vorticity. Such approach allows a decrease in computational time due to a reduction of equation numbers. One of the main challenges in such a technique is a determining the stream function magnitude at the inner body walls. A solution of this problem has been described in detail in this paper. Computational scrutinizing has been performed by employing the finite difference technique. The mesh sensitivity analysis and comparison with theoretical and experimental results of other researchers have been included. An influence of the Rayleigh number, nanoparticles concentration, internal block size, heat conductivity ratio and non-dimensional time on nanofluid motion and energy transport has been studied.

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“…It was obvious that solid volume fraction and temperature are two positive factors for heat transfer. The convection heat transfer of nanofluids has been investigated by many mathematical models, such as nanofluids in lid‐driven cavity considering the buoyancy force, entropy generation of nanofluids in a partially open triangular cavity, free convection of nanofluids in a cavity filled with porous media, nanocomposites PCMs in an enclosure with metallic fin, nanofluids in a porous enclosure under electric field, nanofluds in a porous lid‐driven cubic enclosure, Al 2 O 3 –water nanofluids in channel, nanofluids in closed domain, nanofluids in a horizontal layer considering rotation and magnetic field, nanofluids in a tapered asymmetric channel, and nanofluids in the neighborhood of a stagnation point . Sheikholeslami et al adopted control volume finite element method to research thermal performance of different nanofluids.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on thermo‐hydraulic performance of nanofluids upward flowing through helical tubes of heat exchanger system based on thermal efficiency

Zhai

Liu

et al. 2019

Asia-Pacific J Chem Eng

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Convective heat transfer and resistance coefficient of nanofluids upward flowing through helical tubes are experimentally researched in this paper.The effects of three factors (thread pitches [s = 10, 12.5, and 15 cm], inclination angles [β = 0°, 45°, and 90°], and nanoparticle mass fractions [ω = 0.0, 0.1, 0.3, and 0.5 wt.%]) on the heat transfer and flow characteristics are discussed. A thermal efficiency evaluation plot is applied to evaluate the thermo-hydraulic performance of nanofluids. Results show that Nusselt number and resistance coefficient increase with the increasing nanoparticle mass fraction and the decreasing thread pitches. It is also found that helical tube with inclination angle β = 45°shows the best heat transfer performance and that with inclination angle β = 90°shows the worst heat transfer performance. In addition, it is found from the thermal efficiency evaluation plot that the experimental data almost locate in Regions I and II and nanofluids in helical tubes can improve the heat transfer under the same pressure drop. The helical tube with s = 10 cm and β = 45°at the range of Reynolds number (Re > 8,000) shows the largest thermal efficiency.

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Entropy generation due to natural convection of a nanofluid in a partially open triangular cavity

Cited by 104 publications

References 45 publications

The effect of Al 2 O 3 -water nanofluid on the heat transfer and entropy generation of laminar forced convection through isotropic porous media

The effect of Al 2 O 3 -water nanofluid on the heat transfer and entropy generation of laminar forced convection through isotropic porous media

Thermal Convection of Nanoliquid in a Double-Connected Chamber

Experimental study on thermo‐hydraulic performance of nanofluids upward flowing through helical tubes of heat exchanger system based on thermal efficiency

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