In the case of an electro-magneto-hydrodynamic actuator, little is known about the thermo-magneto-hydrodynamic irreversibilities arising in the dissipative flows of weakly conducting fluids past over a moving Riga plate. In this study, the electro-magneto-hydrodynamic convective flow features of a viscous electrically conducting fluid over a horizontal Riga plate are deliberated comprehensively by considering the wall suction and Joule heating effects. It is assumed that the permanent magnets are of equal width and mounted alternatively on a plane surface. Due to the electromagnetic proprieties of the Riga plate, the exponentially decaying Grinberg term is included in the momentum conservation equation as a resistive drag force in this investigation. The modeled differential equations were non-dimensionalized and simplified mathematically by utilizing suitable dimensionless variables and adopting admissible physical assumptions. Numerical solutions were established herein by utilizing an efficient algorithm based on the generalized differential quadrature method and the Newton–Raphson iterative technique. It is worth concluding that the presence of the wall suction effect enhances noticeably the heat transfer rate and its thermodynamic irreversibility near the Riga plate, while a reverse feature is depicted with the elevating strengths of the magnetization field.

Novel Physical Insights into the Thermodynamic Irreversibilities Within Dissipative EMHD Fluid Flows Past over a Moving Horizontal Riga Plate in the Coexistence of Wall Suction and Joule Heating Effects: A Comprehensive Numerical Investigation

Investigation of MHD Eyring–Powell fluid flow over a rotating disk under effect of homogeneous–heterogeneous reactions

The present analysis deals with the entropy analysis of the blood flow through an anisotropically tapered arteries under the suspension of magnetic Zinc-oxide (ZnO) nanoparticles (NPs). The Jeffrey fluid model is contemplated as blood that is electrically conducting and incompressible. The lubrication approach is used for the mathematical modeling. The second law of thermodynamics is used to examine the entropy generation. The exact solutions are obtained against velocity and temperature profile with the use of computational software. The results for Entropy, Velocity, Bejan number, temperature profile, and impedance profile are discussed by plotting the graphs. ZnO-NPs have promising applications in biomedical engineering due to its low toxicity, economically reliable, and excellent biocompatibility. ZnO-NPs also emerged in medicine i.e., antibacterial and anticancer activity, and also beneficial in antidiabetic treatment. The monitoring of the blood temperature in the case of the tapered artery has supreme importance in controlling the temperature of blood in the living environment. The presence of a magnetic field is advantageous to manage and control the blood motion at different temperatures. The present outcomes are enriched to give valuable information for the research scientists in the field biomedical science, who are looking to examine the blood flow with stenosis conditions and also beneficial in treating multiple diseases.

https://www.mdpi.com/1099-4300/22/10/1070/pdf

Entropy Analysis on the Blood Flow through Anisotropically Tapered Arteries Filled with Magnetic Zinc-Oxide (ZnO) Nanoparticles.

Effect of variable thermal conductivity and viscosity on Casson nanofluid flow with convective heating and velocity slip.

Presence of different terms with various values can alter the thermal behavior of the nanofluids flow over porous surfaces. The aim of this research is to study the influence of nanoparticles volume fraction, nanoparticles type, suction or injection, the heat generation or absorption, the Eckert number, thermal and velocity slip parameters, and radiation on the velocity and temperature fields on the flow and heat transfer over a porous flat plate. Four different types of nanoparticles including metal nanoparticles (Cu), metal oxide nanoparticles (Al2O3) and carbon-based nanomaterials (MWCNTs and SWCNTs) which were dispersed in the water (as based fluid) are studied. The governing equations are converted into the ordinary differential equations using similarity solution and solved numerically by the RKF45 algorithm. The results of the simulations showed a contradiction with the results of other researchers who expressed that using nanoparticles with higher thermal conductivity and volume fraction led to increasing heat transfer rate in nanofluids; this study proves that, in some cases, boosting the volume fraction of nanoparticles has a potential to decrease the heat transfer rate due to significant changes in values of some parameters including radiation, heat generation, and viscous dissipation.

Heat transfer and nanofluid flow over a porous plate with radiation and slip boundary conditions

In this work, we present the theoretical investigation of the transient rotating electro-osmotic flow of a couple stress fluid in a microchannel, through the Laplace transform technique. The analysis is dependent on the Debye–Huckel linear approximation for electrical potentials. The governing equations of the couple stress fluid are taken to address the flow field in a rotating environment. The mathematical formulation of these governing equations provides a system of ordinary differential equations, which are then solved to achieve analytical solutions for electrostatic potential, axial and transverse velocity distribution, and volumetric flow rate. A comparison was made for the present analytical solution with data available in the literature. There was excellent matching. The characteristics of different influential parameters on axial and transverse velocity distributions, volume, and angle flow rates are pictorially deliberated. The study reveals that the rise in the couple stress parameter accelerates the axial electro-osmotic flow velocity inside the electrical double layer.

Unsteady electro-osmotic flow of couple stress fluid in a rotating microchannel: An analytical solution

Unsteady squeezing flow of a radiative Eyring-Powell fluid channel flow with chemical reactions

Inherent irreversibility in the flow of a reactive third grade fluid though a channel with convective heating is examined. It is well known that heat dissipated from the exothermic chemical reaction passes through fluid in an irreversible manner and as a result entropy is generated continuously within the channel. Analytical solutions of the resulting dimensionless nonlinear boundary-value-problems arising from the governing equations were obtained by using perturbation method. These solutions are utilized to obtain the entropy generation rate and Bejan number for the system. The influence of various important parameters on the entropy generation rate and Bejan number are shown graphically and discussed accordingly.

https://cyberleninka.org/article/n/1409158.pdf

Irreversibility analysis for reactive third-grade fluid flow and heat transfer with convective wall cooling

Couple stress fluid flow with variable properties: A second law analysis

https://dl.begellhouse.com/download/article/287c5e1908580a3b/18305-final.pdf

Srinivas Jangili

Papers

Unsteady electro-osmotic flow of couple stress fluid in a rotating microchannel: An analytical solution

Unsteady squeezing flow of a radiative Eyring-Powell fluid channel flow with chemical reactions

Irreversibility analysis for reactive third-grade fluid flow and heat transfer with convective wall cooling

Couple stress fluid flow with variable properties: A second law analysis

Homotopy study of entropy generation in magnetized micropolar flow in a vertical parallel plate channel with buoyancy effect