Thermal stability and entropy generation of unsteady reactive hydromagnetic Powell-Eyring fluid with variable electrical and thermal conductivities

This research considers the third-grade liquid flow and criticality branched-chain of a thermal reaction in a Couette generalized medium with a nonlinear viscosity model. A dimensionless transformation of the system momentum and heat equations are carried out. Compared with the diffusion coefficient, the flow is stimulated by initiation reaction rate, reaction branch-chain order, non-Newtonian term, thermal Grashof number, and pressure gradient. The reactive fluid is fully exothermic with consumption of the material, and the heat exchange in the system is greater than the exchange of heat with the ambient. A semianalytical collocation weighted residual scheme is employed for the branch-chain slice bifurcation, dimensionless energy, and momentum solutions. The results show that exponential decreases in the thermal fluid viscosity can help in controlling the boundless heat produced by the Frank-Kamenetskii term and initiation reaction rate. Therefore, the results will help in stimulating positive combustion processes.

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“…The heat-dependent dynamic viscosity is assumed to exponentially vary according to Salawu et al [ 17 , 27 ]:

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Section: Problem Formulationmentioning

confidence: 99%

“…Thermal criticality performs a significant role in processing and handling of the non-Newtonian fluid. It exists when the heat generation rate in a reactive flow system transcends heat dissipation to the environments [ 17 , 18 ]. This occurrence is the basis for thermal ignition or runaway in a flow system, Frank-Kamenetskii [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

On Criticality for a Generalized Couette Flow of a Branch-Chain Thermal Reactive Third-Grade Fluid with Reynold’s Viscosity Model

Salawu

Disu

Dada

2020

The Scientific World Journal

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“…In a very essential sense, an oscillatory motion can be seen as an expression of a transient free surface fluid motion influenced by gravitational forces. That is, transient flow with free surface deformation can be seen as a type of oscillating flow, Salawu et al [8,9]. Considering composite forces in the fluids motion, the internal motions of the fluid particles and the geometry of the free surface show the effect of the interface between force of gravity and pressure force.…”

Section: Introductionmentioning

confidence: 99%

Transient Heat and Mass Transfer of Hydromagnetic Effects on the Flow Past a Porous Medium with Movable Vertical Permeablesheet

Okedoye

Salawu

2020

International Journal of Applied Mechanics and Engineering

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An unsteady flow of heat and species transport through a porous medium in an infinite movable vertical permeable flat surface is considered. The hydromagnetic chemical reactive fluid flow is stimulated by the thermal and solutant convection, and propelled by the movement of the surface. The formulated nonlinear flow equations in time space are solved analytically by asymptotic expansions to obtain solutions for the flow momentum, energy and chemical concentration for various thermo-physical parameters. The existence of flow characteristic is defined with the assistance of the flow parameters. In the study, the impact of some pertinent flow terms is reported and discussed. The study revealed that the species boundary layer increases with a generative chemical reaction and decreases with a destructive chemical reaction. Also, arise in the generative species reaction term reduces the flow momentum for the cooling surface. The impact of other flow governing parameters is displayed graphically as well as the fluid wall friction, wall energy and species gradients. The results of this study are important in chemical thermal engineering for monitoring processes to avoid solution blow up.

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“…In a thermal system, no matter how small is the heat transfer, energy is lost to the ambient which may not be reversed, and this can greatly impact the efficiency of industrial and technological equipments. The amount of irreversible energy in a system determines the total entropy generated by the system (Salawu, Hassan et al, 2019). The thermodynamic second law is utilized in evaluating the volumetric entropy generation due to friction force, chemical reaction, liquid viscosity, and reaction diffusion (Fatunmbi & Salawu, 2020;Hayat et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Unsteady radiative magnetohydromagnetic flow and entropy generation of maxwell nanofluid in a porous medium with arrhenius chemical kinetic

Olanrewaju

Salawu

Olanrewaju³

et al. 2021

Cogent Engineering

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Parametric sensitivity of unsteady Maxwell magnetohydromagnetic nanofluid and second thermodynamic law analysis under Arrhenius kinetic is investigated in the presence of viscous heating and radiation. The porous flow channel is subjected to tension with material properties that vary with time without deformation. In the absence of fluid charge polarization, the conducting liquid is influenced by the sheet stretching velocity. The flow coupled derivatives model is reduced to dimensionless form by relevant transformation variables. These are computational solved by shooting numerical technique together with Fehlberg Runge-Kutta procedures. The essential characteristics of the flow and thermodynamic irreversibility are determined. The results are quantitatively and qualitatively compared with other studies and are established to agree well. The graphical results revealed that Lewis number increases the molecular species concentration and the thermodynamic stability for reversibility can be enhanced by the augmentation of magnetic field, thermophoresis, and radiation. Therefore, for thermal and chemical reaction systems, increasing heat propagation should be managed to keep the system from blowing up.

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Thermal stability and entropy generation of unsteady reactive hydromagnetic Powell-Eyring fluid with variable electrical and thermal conductivities

Cited by 34 publications

References 28 publications

On Criticality for a Generalized Couette Flow of a Branch-Chain Thermal Reactive Third-Grade Fluid with Reynold’s Viscosity Model

On Criticality for a Generalized Couette Flow of a Branch-Chain Thermal Reactive Third-Grade Fluid with Reynold’s Viscosity Model

Transient Heat and Mass Transfer of Hydromagnetic Effects on the Flow Past a Porous Medium with Movable Vertical Permeablesheet

Unsteady radiative magnetohydromagnetic flow and entropy generation of maxwell nanofluid in a porous medium with arrhenius chemical kinetic

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