Impact of variable fluid properties on forced convection of Fe3O4/CNT/water hybrid nanofluid in a double-pipe mini-channel heat exchanger

Shahsavar, Amin; Godini, Ali; Talebizadehsardari, Pouyan; Toghraie, Davood; Salehipour, Hamzeh

doi:10.1007/s10973-018-07997-6

Cited by 135 publications

(26 citation statements)

References 56 publications

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“…Therefore, the performing of stability analysis of solutions should be considered to stop wrong predictions regarding the flow characteristics and solutions. In this study, the system of the eigenvalue problem (19)(20) was solved with the help of BVP4C code in the MATLAB software in order to obtain the values of the smallest eigenvalue, ε 1 . The signs of the smallest eigenvalue, ε 1 , help to indicate a stable solution.…”

Section: Resultsmentioning

confidence: 99%

“…Their discovery is a new research direction in fluid dynamics. Since then, numerous researchers have been focusing on hybrid nanofluid in their work and have discovered some interesting and promising results, as can be seen in these articles [17][18][19][20][21][22]. In 2016, Devi and Devi [23] contemplated the copper-alumina/water hybrid nanofluid numerically.…”

Section: Introductionmentioning

confidence: 99%

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Dual Solutions and Stability Analysis of Magnetized Hybrid Nanofluid with Joule Heating and Multiple Slip Conditions

et al. 2020

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This paper investigates the steady, two dimensional, and magnetohydrodynamic flow of copper and alumina/water hybrid nanofluid on a permeable exponentially shrinking surface in the presence of Joule heating, velocity slip, and thermal slip parameters. Adopting the model of Tiwari and Das, the mathematical formulation of governing partial differential equations was constructed, which was then transformed into the equivalent system of non-linear ordinary differential equations by employing exponential similarity transformation variables. The resultant system was solved numerically using the BVP4C solver in the MATLAB software. For validation purposes, the obtained numerical results were compared graphically with those in previous studies, and found to be in good agreement, as the critical points are the same up to three decimal points. Based on the numerical results, it was revealed that dual solutions exist within specific ranges of the suction and magnetic parameters. Stability analysis was performed on both solutions in order to determine which solution(s) is/are stable. The analysis indicated that only the first solution is stable. Furthermore, it was also found that the temperature increases in both solutions when the magnetic parameter and Eckert number are increased, while it reduces as the thermal slip parameter rises. Furthermore, the coefficient of skin friction and the heat transfer rate increase for the first solution when the magnetic and the suction parameters are increased. Meanwhile, no change is noticed in the boundary layer separation for the various values of the Eckert number in the heat transfer rate.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dual Solutions and Stability Analysis of Magnetized Hybrid Nanofluid with Joule Heating and Multiple Slip Conditions

et al. 2020

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“…They found that the MWCNT-water nanofluid with arginine showed better heat transfer performance than that with gum Arabic at the same concentrations. Magnetic nanofluids have been widely used in different fields, such as thermal engineering [10] (heat exchanger, solar collector, air conditioning system, etc. ), bioengineering and optical [11] and sealing technology.…”

Section: Introductionmentioning

confidence: 99%

Improvement of cooling performance of hybrid nanofluids in a heated pipe applying annular magnets

Wang

Zheng

et al. 2021

J Therm Anal Calorim

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In this paper, convective heat transfer of Fe3O4–carbon nanotubes (CNTs) hybrid nanofluid was studied in a horizontal small circular tube under influence of annular magnets. The pipe has an inner diameter of 3 mm and a length of 1.2 m. Heat transfer characteristics of the Fe3O4–water nanofluid were examined for many parameters, such as nanoparticle volume fraction in the range of 0.4–1.2% and Reynolds number in the range of 476–996. In order to increase the thermal conductivity of the Fe3O4–water nanofluid, carbon nanotubes with 0.12–0.48% volume fraction were added into the nanofluid. It was observed that for the Fe3O4–CNTs–water nanofluid with 1.44% volume fraction and under a magnetic field, the maximal local Nusselt number at the Reynolds number 996 increased by 61.54% compared with without a magnetic field. Results also show that compared with the deionized water, the maximal enhancements of the average Nusselt number are 67.9 and 20.89% for the Fe3O4–CNTs–water nanofluid with and without magnetic field, respectively.

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“…Vajravelu et al [32] discussed unsteady convective flow in a vertical surface with variable fluid properties. Shahsavar et al [33] investigated the impact of variable fluid properties in hybrid nanofluid. Naganthran et al [34] found results of the stretching and shrinking sheet with variable fluid properties.…”

Section: Introductionmentioning

confidence: 99%

Magnetohydrodynamic Time-Dependent Bio-Nanofluid Flow in a Porous Medium with Variable Thermophysical Properties

Irfan

Farooq

Aslam

et al. 2021

Mathematical Problems in Engineering

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In this work, a theoretical model with a numerical solution is brought forward for a bio-nanofluid with varying fluid features over a slippery sheet. The partial differential equations (PDEs) involving temperature-dependent quantities have been translated into ordinary differential equations (ODEs) by using similarity variables. Numerical verifications have been done in three different methods: finite difference method, shooting method, and bvp4c. To figure out the influence of parameters on the flows, the graphs are plotted for the velocity, temperature, concentration, and microorganism curves. The boundary layer thickness of the microorganism profile reduces with the Schmidt number and Peclet number. In addition to adding radiative heat flux, we added heat generation, rate of chemical reaction, and first-order slip. Adding these parameters brought new aspects to the underlying profiles. Moreover, the obtained data of the skin friction coefficient, the local Nusselt number, the local Sherwood number, and the local density of motile microorganisms are tabulated against various parameters for the physical parameters. From the results, it is apparent that the local Nusselt number decreases with the Brownian and thermophoretic parameters. The data obtained for physical parameters have a close agreement with the published data. Finally, the graphs for slip conditions are significantly different when the comparison is drawn with no-slip condition.

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Impact of variable fluid properties on forced convection of Fe3O4/CNT/water hybrid nanofluid in a double-pipe mini-channel heat exchanger

Cited by 135 publications

References 56 publications

Dual Solutions and Stability Analysis of Magnetized Hybrid Nanofluid with Joule Heating and Multiple Slip Conditions

Dual Solutions and Stability Analysis of Magnetized Hybrid Nanofluid with Joule Heating and Multiple Slip Conditions

Improvement of cooling performance of hybrid nanofluids in a heated pipe applying annular magnets

Magnetohydrodynamic Time-Dependent Bio-Nanofluid Flow in a Porous Medium with Variable Thermophysical Properties

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