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Entropy optimization on Casson nanofluid flow with radiation and arrhenius activation energy over different geometries:A numerical and statistical approach

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Propulsion and Power Research 2024年第3期13卷 375-393页

作者： M.Priya P.Bala Anki Reddy Department of Mathematics S.A.S.Vellore Institute of TechnologyVellore 632014India

This study employs numerical and statistical approaches to investigate the entropy optimization of steady Casson nanofluidflow over three different geometries subject to boundary conditions induced by *** linear regression is employed to statistically *** present model incorporates several novel elements,such as arrhenius activation energy,Brownian motion,the Cattaneo-Christov dualflux,thermophoresis,thermal radiation,and so ***,a comparison is presented between Newtonian and *** applying the proper similarity transformations,ordinary differential equations(ODEs)are ob-tained by converting foundational partial differential equations(PDEs).The Runge-Kutta fourth-order method is utilised to solve the obtained ODEs along with the shooting *** out-comes are visually depicted via tables and *** velocity drops with increasing Grashof number,and the magneticfield becomes progressively more forceful as the suction parameter *** temperature gets reduced with the increase of the suction parameter,solute Grashof number increases with the magneticfield,thermophoresis,and radiation *** entropy is observed to rise with the increase of the effective parameters(magneticfield,Brinkmann num-ber and radiation).The MAD(mean absolute deviation),MSE(mean squared error),and RMSE(root mean square error)values are approaching zero,indicating that the derived outcomes are highly accurate.A lower MAPE(mean absolute percentage error)suggests that the model has a higher level of ***,the outcomes of the present model are more precise and *** study has various potential applications such as power plant heat exchangers,material processing industries,and solar thermal energy systems.

关键词： Cassonfluid arrhenius activation energy Entropy generation Thermophoresis Multiple linear regression

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Buoyancy driven Flow of a Second-Grade Nanofluid flow Taking into Account the arrhenius activation energy and Elastic Deformation:Models and Numerical Results

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Fluid Dynamics & Materials Processing 2021年第2期17卷 319-332页

作者： R.Kalaivanan N.VishnuGanesh Qasem M.Al-Mdallal Department of Mathematics Vivekananda CollegeMadurai625234India PG and Research Department of Mathematics Ramakrishna Mission Vivekananda CollegeChennai600004India Department of Mathematical Sciences United Arab Emirates UniversityAl AinAbu DhabiUnited Arab Emirates

The buoyancy driven flow of a second-grade nanofluid in the presence of a binary chemical reaction is analyzed in the context of a model based on the balance equations for mass,species concentration,momentum and *** elastic properties of the considered fluid are taken into *** two-dimensional slip flow of such non-Newtonian fluid over a porous flat material which is stretched vertically upwards is *** role played by the activation energy is accounted for through an exponent form modified arrhenius function added to the Buongiorno model for the nanofluid *** effects of thermal radiation are also examined.A similarity transformations is used to turn the problem based on partial differential equations into a system of ordinary differential *** resulting system is solved using a fourth order RK and shooting *** velocity profile,temperature profile,concentration profile,local skin friction,local Nusselt number and local Sherwood number are reported for several *** influence of the chemical reaction on the properties of the concentration and momentum boundary layers is critically discussed.

关键词： arrhenius activation energy buoyancy effects chemical reaction elastic deformation nanofluid nonlinear thermal radiation

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Numerical simulation for Darcy-Forchheimer 3D rotating flow subject to binary chemical reaction and arrhenius activation energy

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Journal of Central South University 2019年第5期26卷 1250-1259页

作者： Tasawar HAYAT Arsalan AZIZ Taseer MUHAMMAD Ahmed ALSAEDI Department of Mathematics Quaid-I-Azam UniversityIslamabad 44000Pakistan Nonlinear Analysis and Applied Mathematics (NAAM) Research Group Department of MathematicsFaculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Department of Mathematics Government College Women UniversitySialkot 51310Pakistan

Three-dimensional Darcy-Forchheimer nanoliquid flow in the presence of rotating frame and activation energy is *** is developed through linearly stretching of the *** of heat and mass exchange is given due *** novel characteristics in regards to Brownian dispersion and thermophoresis are *** variation in partial differential framework (PDEs) to nonlinear ordinary differential framework (ODEs) is done through reasonable *** differential frameworks have been computed in edge of *** regarding thermal field and concentration distribution for several involved parameters is pivotal *** amounts like surface drag coefficients,transfer of heat and mass rates are portrayed by numeric *** is noticed that impacts of porosity parameter and Forchheimer number on the thermal and concentration fields are quite *** temperature and associated thermal layer thickness are enhanced for larger porosity parameter and Forchheimer *** and concentration fields exhibit similar trend for the higher values of rotational *** of thermal and concentration Biot numbers on the temperature and concentration fields are qualitatively *** Prandtl and Schmidt numbers correspond to stronger temperature and concentration *** nondimensional activation energy,temperature difference parameter and fitted rate constant yield weaker concentration *** motion parameter for temperature and concentration has reverse effects while similar trend is observed via thermophoresis parameter.

关键词： nanoparticles rotating frame arrhenius activation energy Darcy-Forchheimer porous space numerical solution

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Transfer of electrons on scratched iron surfaces:Photoelectron emission and X-ray photoelectron spectroscopy studies

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Friction 2018年第1期6卷 98-115页

作者： Yoshihiro MOMOSE Daisuke SUZUKI Keika TSURUYA Takao SAKURAI Keiji NAKAYAMA Department of Materials Science Ibaraki University Ashikaga Institute of Technology Institute of Mesotechnology

We report the activation energy, ΔEa, for the quantum yield in thermally assisted photoelectron emission(TAPE) under 210-nm-wavelength light irradiation, and the associated X-ray photoelectron spectroscopy(XPS) results. Samples were cleaned only in acetone and scratched in air, water, methanol, ethanol, acetone, benzene, and cyclohexane. Glow curves, describing the temperature dependence of photoelectron emission(PE) quantum yield(emitted electrons/photon), Y, were obtained. A simple method of determining ΔEa using Y, called YGC, at seven temperatures up to 353 °C, for the same Y glow curve, was proposed. The ΔEa obtained using this method was almost the same as that obtained from Y for seven stationary temperatures(YST). For scratched samples, the TAPE was measured over two cycles of temperature increase and subsequent decrease(Up1, Down1 and Up2, Down2 scans) in the 25–339 °C range, and ΔE_a was obtained from YGC. The arrhenius plot was approximated by a straight line, although a convex swelling peak appeared in the Up1 scan. ΔE_(aUp1) was in the 0.212–0.035 eV range, depending on the environment in which scratching was performed; ΔE_(aUp1) for water was much higher than that for acetone. This was explained in terms of the mode of the acid–base interaction between the liquid molecules and the hydroxyl group of Fe–OH. The values of ΔE_(aDown1), ΔEa Up2, and ΔE_(aDown2) were in the 0.038–0.012 eV range. The total count of electrons emitted during the Up1 and Up2 scans was found to decrease with increasing ΔE_(aUp1) and ΔE_(aUp2), respectively. ΔE_(aUp2) was found to increase with increasing presence of the FeO component in the analyzed Fe oxides. The convex swelling peak was attributed to the removal of carbon materials from the scratched surface and the effect of the increased electron density of the surface hydroxyl group of FeOH under the light irradiation.

关键词： thermally assisted photoelectron emission XPS real iron scratch-inducing environment arrhenius activation energy environment molecule-surface hydroxyl group interaction

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