Entropy Generation Analysis for a Radiative Micropolar Fluid Flow Through a Vertical Channel Saturated with Non-Darcian Porous Medium

Jangili, Srinivas; Adesanya, Samuel O.; Falade, J.A.; Gajjela, Nagaraju

doi:10.1007/s40819-017-0322-8

Cited by 27 publications

(18 citation statements)

References 33 publications

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“…We next invoke the transformed form of boundary condition (8) on (16) to determine the values of all the unknown coefficients stated in (15). Coding To verify the accuracy of the results, the exact solution of the velocity profile (6) subject to the boundary conditions (8) at βvKn ¼ 0:05, Gr ¼ 0, a ¼ 1, Re…”

Section: Differential Transformation Methods (Dtm)mentioning

confidence: 99%

“…This implies that entropy generation which destroys the available energy leading to inefficiency of thermal designs exists. Therefore, the aim of this research endeavour is the minimisation of irreversibility associated with microchannel flow of couple stress fluid by applying the robust approach proposed by Bejan [13] and applied by numerous researchers such as Adesanya and collaborators [14][15][16], Adesanya and Makinde [17][18], Ajibade and Jha [19], Eegunjobi and Makinde [20][21], Das and Jana [22] and more recently Opanuga and his collaborators [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Convection Flow of MHD Couple Stress Fluid in Vertical Microchannel with Entropy Generation

Opanuga¹,

Agboola²,

Okagbue³

et al. 2020

Pattern Formation and Stability in Magnetic Colloids

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Entropy generation of fully developed steady, viscous, incompressible couple stress fluid in a vertical micro-porous-channel in the presence of horizontal magnetic field is analysed in this work. The governing equations for the flow are derived, and nondimensionalised and the resulting nonlinear ordinary differential equations are solved via a rapidly convergent technique developed by Zhou. The solution of the velocity and temperature profiles are utilised to obtain the flow irreversibility and Bejan number. The effects of couple stresses, fluid wall interaction parameter (FSIP), effective temperature ratio (ETR), rarefaction and magnetic parameter on the velocity profile, temperature profile, entropy generation and Bejan number are presented and discussed graphically.

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Section: Differential Transformation Methods (Dtm)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Convection Flow of MHD Couple Stress Fluid in Vertical Microchannel with Entropy Generation

Opanuga¹,

Agboola²,

Okagbue³

et al. 2020

Pattern Formation and Stability in Magnetic Colloids

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“…An advantage of this method is that it can provide analytical approximation or an approximated solution to a wide class of nonlinear equations without linearization, perturbation closure approximation or discretization methods. ADM has gained popularity in modern engineering sciences and has been used for simulation of Newtonian flows, Sisko non‐Newtonian thin film flows, biomagnetic orthopedic lubrication flows, micropolar channel hydrodynamics in channels, entropy minimization in micropolar flow, pulsatile micropolar flow, and stagnation‐point rotating nanofluid flows . ADM deploys an infinite series solution for the unknown functions and utilizes recursive relations.…”

Section: Validation With Admmentioning

confidence: 99%

Influence of variable viscosity and thermal conductivity, hydrodynamic, and thermal slips on magnetohydrodynamic micropolar flow: A numerical study

Rahman

Uddin

Bég

et al. 2019

Heat Trans. Asian Res.

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Thermophysical and wall-slip effects arise in many areas of nuclear technology. Motivated by such applications, in this article, the collective influence of variableviscosity, thermal conductivity, velocity and thermal slip effects on a steady two-dimensional magnetohydrodynamic micropolar fluid over a stretching sheet is analyzed numerically. The governing nonlinear partial differential equations have been converted into a system of nonlinear ordinary differential equations using suitable coordinate transformations. The numerical solutions of the problem are expressed in the form of nondimensional velocity and temperature profiles and discussed from their graphical representations. The Nachtsheim-Swigert shooting iteration technique together with the sixth-order Runge-Kutta integration scheme has been applied for the numerical solution. A comparison with the existing results has been done, and an excellent agreement is found. Further validation with the Adomian decomposition method is included for the general model. Interesting features in the heat and momentum characteristics are explored. It is found that a greater thermal slip and thermal conductivity elevate thermal boundary layer thickness. Increasing Prandtl number enhances the Nusselt number at the wall but reduces wall couple stress (microrotation gradient). Temperatures are enhanced with both the magnetic field and viscosity parameter. Increasing momentum (hydrodynamic) slip is found to accelerate the flow and elevate temperatures.boundary layers, magnetic field, micropolar fluids, nuclear thermal transport, numerical solutions, thermal slip, variable thermal conductivity, velocity slip | INTRODUCTIONHeat transfer is a fundamental aspect of many nuclear engineering transport processes. It may arise in any of the three familiar modes (conduction, convection, and radiation) and indeed these modes often arise simultaneously. Interesting applications include phase change saturated nucleation (see Uesawa et al 1 ), transient electrically conducting convection flows of liquid sodium, 2 nuclear propulsion systems cooling, 3 conjugate thermal transport, 4 supercritical thermal convection in rod bundles, 5 heat emission in turbulent flows of mercury, sodium, lead-bismuth, and sodium-potassium liquid metals, 6 and hybrid electrolysis systems exploiting nuclear energy. 7 Electromagnetic flows also arise in nuclear power systems wherein magnetic fields are deployed to control high-temperature electrically conducting plasmas from damaging, for example, channel walls. Magnetohydrodynamics (MHDs) concern the interaction between electrically conducting liquids and applied magnetic fields. It has extensive applications in emergency heat removal in fast reactors, 8 molten metal pumps for rapid removal of heat from cores, 9 and feeder wall thinning mechanisms in flow-assisted corrosion of alloys in nuclear reactor channels. 10 Although often the working fluids in nuclear reactor systems are air and water, many non-Newtonian liquids are increasingly being deployed. Such fl...

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“…However, the irreversibility analysis of micropolar fluid has not been adequately considered despite the fact that the performance of thermal devices is always affected by fluid irreversibility which usually results in the enhancement of entropy generation and reduction of thermal efficiency. Since the introduction of second law of thermodynamics for irreversibility analysis by its proponent, Bejan [26], the approach has found application in several fluids flow such as third grade fluid [27][28][29], couple stress fluid [30][31][32][33], nanofluid [34], Couette flow [35], Poiseuille flow [36] and even micropolar fluid [37,38], others are found in Refs. [39,40].…”

Section: Introductionmentioning

confidence: 99%

Entropy generation analysis of Hall current effect on MHD micropolar fluid flow with rotation effect

et al. 2019

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Entropy generation in form of heat dissipation destroys useful energy which accounts for the underperformance and decrease in the thermodynamic efficiency of a system. Since micropolar fluid is used as a working fluid in many technological and industrial processes, it is therefore necessary to examine the influence of all factors that can enhance entropy production so as to achieve the best energy systems design. In this paper, the influence of Hall current and ion-slip on the entropy generation rate of micropolar fluid is investigated. An applied uniform magnetic field acts in a perpendicular direction to the flow of fluid. The nonlinear coupled partial differential equations used to model the micropolar fluid flow are transformed to ordinary differential equations by using appropriate similarity variables. The differential equations obtained are solved by applying differential transform method. The results for velocity profiles, temperature profile and microrotation are used to determine fluid irreversibility and Bejan number. To get a clearer view of the study, the effects of various parameters such as Hall, ion-slip, magnetic field and coupling number on primary velocity, secondary velocity, temperature profile, microrotation, entropy generation and Bejan number are presented and explained via plots. The results show that entropy generation is reduced as coupling number and magnetic parameter increase, Bejan number receives a boost with increase in coupling number and magnetic parameter. Furthermore, heat irreversibility is more dominant than fluid friction irreversibility at the region close to the channel walls.

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Entropy Generation Analysis for a Radiative Micropolar Fluid Flow Through a Vertical Channel Saturated with Non-Darcian Porous Medium

Cited by 27 publications

References 33 publications

Convection Flow of MHD Couple Stress Fluid in Vertical Microchannel with Entropy Generation

Convection Flow of MHD Couple Stress Fluid in Vertical Microchannel with Entropy Generation

Influence of variable viscosity and thermal conductivity, hydrodynamic, and thermal slips on magnetohydrodynamic micropolar flow: A numerical study

Entropy generation analysis of Hall current effect on MHD micropolar fluid flow with rotation effect

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