Convective heat transfer and entropy generation analysis of non-Newtonian power-law fluid flows in parallel-plate and circular microchannels under slip boundary conditions

Kiyasatfar, Mehdi

doi:10.1016/j.ijthermalsci.2018.02.013

Cited by 66 publications

(21 citation statements)

References 71 publications

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“…It was reported that entropy rate boosts up subject to higher estimations of Brinkman number while Bejan number declines via same parameter. Few other fruitful studies on entropy generation can be found in previous studies 6–15 …”

Section: Introductionmentioning

confidence: 99%

Interpretation of entropy generation in Williamson fluid flow with nonlinear thermal radiation and first‐order velocity slip

Qayyum

Khan

Masood

et al. 2020

Math Methods in App Sciences

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This research article investigates the impacts of magnetohydrodynamics (MHD), nonlinear thermal radiation, Darcy‐Forchheimer porous medium, viscous dissipation, first‐order velocity slip, and convective boundary condition on the entropy generation optimization in flow of non‐Newtonian fluid (Williamson fluid) towards a flat and stretchable surface. A general entropy equation is derived for thermal heat irreversibility, porosity irreversibility, Joule heating irreversibility, and fluid friction irreversibility. The bvp4c (built‐in‐shooting) technique is utilized to solve the governing equations for the entropy generation. Our obtained results highlight that enhancement in the thermal radiation and magnetic causes an abrupt change in the entropy generation rate. Moreover, the heat transfer rate and velocity gradient (skin friction) are calculated numerically subject to pertinent parameter, and the results are displayed in tabular form.

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Section: Introductionmentioning

confidence: 99%

Interpretation of entropy generation in Williamson fluid flow with nonlinear thermal radiation and first‐order velocity slip

Qayyum

Khan

Masood

et al. 2020

Math Methods in App Sciences

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“…So far, most studies and applications of catalytic porous microchannels have used Newtonian fluids, while effects of non-Newtonian fluids on thermal transport and entropy generation have been seldomly touched [29,30]. However, non-Newtonian fluids are more common in practice and our knowledge of their influences on performance of catalytic porous microchannels should be advanced.…”

Section: Introductionmentioning

confidence: 99%

Heat and mass transfer and thermodynamic analysis of power-law fluid flow in a porous microchannel

Sarafan

Alizadeh

Fattahi

et al. 2020

J Therm Anal Calorim

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Transfer of heat and mass and thermodynamic irreversibilities are investigated in a porous, parallel-plate microreactor in which the working fluid is non-Newtonian. The investigated microreactor features thick flat walls with uneven thicknesses, which can be subject to different thermal loads. The dimensionless governing equations of the resultant asymmetric problem are first derived theoretically and then solved numerically by using a finite volume technique. This results in two-dimensional solutions for the velocity, temperature and concentration fields as well as the distributions of Nusselt number and local and total entropy generations. The results clearly demonstrate the significance of the numerical value of the power-law index and departure from Newtonian behavior of the fluid. In particular, it is shown that by increasing the value of power-law index the Nusselt number on the wall decreases. This leads to the intensification of the temperature gradients in the system and therefore magnifies the local and total entropy generations. Also, it is shown that the wall thickness and thermal asymmetry can majorly affect the heat transfer process and thermodynamic irreversibility of the microreactor. It is noted that the current work is the first comprehensive study of heat transfer and entropy generation in porous micro-chemical reactor with non-Newtonian, power-law fluid.

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“…The temperature was noticed to rise for higher radiation. Kiyasatfar 28 considered the convective slip flow of non-Newtonian fluid through the Power-law model between parallel plates and circular microchannels. The results reveal that reduced fluid stream speed and elevated molecular stability and heat transfer rates against rising slip conditions for both geometries.…”

Section: Introductionmentioning

confidence: 99%

Nanofluid flow containing carbon nanotubes with quartic autocatalytic chemical reaction and Thompson and Troian slip at the boundary

Ramzan

Chung

Kadry

et al. 2020

Sci Rep

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A mathematical model is envisioned to discourse the impact of Thompson and Troian slip boundary in the carbon nanotubes suspended nanofluid flow near a stagnation point along an expanding/contracting surface. The water is considered as a base fluid and both types of carbon nanotubes i.e., single-wall (SWCNTs) and multi-wall (MWCNTs) are considered. The flow is taken in a Dacry-Forchheimer porous media amalgamated with quartic autocatalysis chemical reaction. Additional impacts added to the novelty of the mathematical model are the heat generation/absorption and buoyancy effect. The dimensionless variables led the envisaged mathematical model to a physical problem. The numerical solution is then found by engaging MATLAB built-in bvp4c function for non-dimensional velocity, temperature, and homogeneous-heterogeneous reactions. The validation of the proposed mathematical model is ascertained by comparing it with a published article in limiting case. An excellent consensus is accomplished in this regard. The behavior of numerous dimensionless flow variables including solid volume fraction, inertia coefficient, velocity ratio parameter, porosity parameter, slip velocity parameter, magnetic parameter, Schmidt number, and strength of homogeneous/heterogeneous reaction parameters are portrayed via graphical illustrations. Computational iterations for surface drag force are tabulated to analyze the impacts at the stretched surface. It is witnessed that the slip velocity parameter enhances the fluid stream velocity and diminishes the surface drag force. Furthermore, the concentration of the nanofluid flow is augmented for higher estimates of quartic autocatalysis chemical.

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Convective heat transfer and entropy generation analysis of non-Newtonian power-law fluid flows in parallel-plate and circular microchannels under slip boundary conditions

Cited by 66 publications

References 71 publications

Interpretation of entropy generation in Williamson fluid flow with nonlinear thermal radiation and first‐order velocity slip

Interpretation of entropy generation in Williamson fluid flow with nonlinear thermal radiation and first‐order velocity slip

Heat and mass transfer and thermodynamic analysis of power-law fluid flow in a porous microchannel

Nanofluid flow containing carbon nanotubes with quartic autocatalytic chemical reaction and Thompson and Troian slip at the boundary

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