检索结果-南通市图书馆

Applied Mathematics and Mechanics(English Edition) 2024年第9期45卷 1613-1632页

作者： K.cHANDAN K.KARTHIK K.V.NAGARAJA b.c.prasannakumara R.S.VARUN KUMAR T.MUHAMMAD Amrita School of Artificial Intelligence Amrita Vishwa Vidyapeetham Department of Studies in Mathematics Davangere University computational Science Lab Amrita School of EngineeringAmrita Vishwa Vidyapeetham Department of Pure and Applied Mathematics School of Mathematical Sciences Sunway University Department of Mathematics College of Science King Khalid University

The heat transfer through a concave permeable fin is analyzed by the local thermal non-equilibrium(LTNE) model. The governing dimensional temperature equations for the solid and fluid phases of the porous extended surface are modeled, and then are nondimensionalized by suitable dimensionless terms. Further, the obtained nondimensional equations are solved by the clique polynomial method(cPM). The effects of several dimensionless parameters on the fin's thermal profiles are shown by graphical illustrations. Additionally, the current study implements deep neural structures to solve physics-governed coupled equations, and the best-suited hyperparameters are attained by comparison with various network combinations. The results of the cPM and physicsinformed neural network(PINN) exhibit good agreement, signifying that both methods effectively solve the thermal modeling problem.

关键词： 05c31 65H10 65L60 74A15 80A05 fin heat transfer local thermal non-equilibrium (LTNE) model O174.14 O414.14 physics-informed neural network (PINN) porous fin

bioconvective nanofluid flow over an exponential stretched sheet with thermophoretic particle deposition

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Propulsion and Power Research 2023年第2期12卷 284-296页

作者： b.c.prasannakumara J.K.Madhukesh G.K.Ramesh Department of Studies in Mathematics Davangere UniversityDavangereKarnataka 577002India Department of Mathematics K.L.E.Society’s J.T.CollegeGadagKarnataka 582101India Department of Mathematics Amrita School of EngineeringAmrita Vishwa VidyapeethamBengaluruIndia

The current work is being done to investigate the flow of nanofluids across a porous exponential stretching surface in the presence of a heat source/sink,thermophoretic particle deposition,and *** collection of PDEs(partial differential equations)that represent the fluid moment is converted to a system of ODEs(ordinary differential equations)with the use of suitable similarity variables,and these equations are then numerically solved using Runge Kutta Fehlberg and the shooting *** different physical limitations,the numerical results are visually *** results show that increasing the porosity characteristics reduces *** mass transfer decreases as the thermophoretic limitation *** in the porosity parameter reduce skin friction,increases in the solid volume fraction improve the rate of thermal distribution,and increases in the thermophoretic parameter increase the rate of mass transfer.

关键词： Exponential stretching sheet Nanofluid Heat source/sink Thermophoretic particle deposition bio convection

Investigation of Ti6Al4V and AA7075 alloy embedded nanofluid flow over longitudinal porous fin in the presence of internal heat generation and convective condition

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

communications in Theoretical Physics 2020年第2期72卷 23-29页

作者： G Sowmya b J Gireesha S Sindhu b c prasannakumara Department of PG Studies and Research in Mathematics Kuvempu UniversityShankaraghatta-577451KarnatakaIndia Department of Mathematics Davangere UniversityDavangere-577002KarnatakaIndia

The thermal attributes of porous fin due to radiation and natural convection have been carried out in the presence of nanofluid *** geometry of the fin taken for the analysis is rectangular profiled longitudinal *** temperature-dependent internal heat generation condition is also considered along with Darcy’s *** two types of nanofluid containing titanium alloy(Ti6Al4V)and aluminium alloy(AA7075)immersed in water is considered for the *** modelled nonlinear ordinary differential equation is numerically solved by the Runge–Kutta–Fehlberg *** impact of geometric parameter on the heat transfer analysis of the fin due to the flow of both nanofluids is plotted and consequences are physically *** is observed that the presence of the water-based titanium alloy better enhances the fin heat transfer rate.

关键词： alloys nanofluid porous fin heat transfer analysis convective condition internal heat generation

Significance of Stefan blowing effect on flow and heat transfer of casson nanofluid over a moving thin needle

在线全文

学校读者我要写书评

暂无评论

communications in Theoretical Physics 2021年第9期73卷 51-58页

作者： A M Jyothi R Naveen Kumar R J Punith Gowda b c prasannakumara bangalore Institute of Technology BangaloreIndia Department of Studies and Research in Mathematics Davangere UniversityDavangere-577002KarnatakaIndia

The current mathematical model explains the influence of non-linear thermal radiation on the casson liquid flow over a moving thin needle by considering buongiorno’s nanofluid *** influences of Stefan blowing,Dufour and Soret effects are also considered in the *** equations which represent the described flow pattern are reduced to ordinary differential equations(ODEs)by using apt similarity transformations and then they are numerically solved with Runge–Kutta-Fehlberg’s fourth fifth-order method(RKF-45)with shooting *** impacts of pertinent parameters on thermal,mass and velocity curves are deliberated *** friction,rate of heat and mass transfer are also discussed *** reveal that,the increase in values of brownian motion,thermophoresis,Dufour number,heating and radiative parameters improves the heat *** increasing values of the Schmidt number deteriorates the mass transfer but a converse trend is seen for increasing values of the Soret ***,the escalating values of the radiative parameter decays the rate of heat transfer.

关键词： moving thin needle brownian motion and thermophoretic diffusion non-linear thermal radiation Stefan blowing condition

Magnetohydrodynamic flow and heat transfer of a hybrid nanofluid over a rotating disk by considering Arrhenius energy

在线全文

学校读者我要写书评

暂无评论

communications in Theoretical Physics 2021年第4期73卷 9-20页

作者： M Gnaneswara Reddy Naveen Kumar R b c prasannakumara N G Rudraswamy K Ganesh Kumar Department of Mathematics Acharya Nagarjuna University CampusOngole-523001India Department of Studies and Research in Mathematics Davangere UniversityShivagangothriDavangere-577007KarnatakaIndia Department of Mathematics P.C.Jabin Science CollageHubballi-580031India

This research work explores the effect of hybrid nanoparticles on the flow over a rotating disk by using an activation energy ***,we considered molybdenum disulfide and ferro sulfate as nanoparticles suspended in base fluid *** magnetic field is pragmatic normal to the hybrid nanofluid flow *** derived nonlinear ordinary differential equations are non-dimensionalized and worked out numerically with the help of Maple software by the RKF-45 *** scientific results for a non-dimensionalized equation are presented for both nanoparticle and hybrid nanoparticle *** of various predominant restrictions on flow and thermal fields are *** estimation for friction factor,local Nusselt number and Sherwood number are also *** reveal that the reduction of the heat transfer rate is greater in hybrid nanoparticles when compared to nanoparticles for increasing values of Eckert Number and the thermal field enhances for the enhanced values of volume fraction.

关键词： porous medium MHD hybrid nanoparticles activation energy

bio-Marangoni convection flow of casson nanoliquid through a porous medium in the presence of chemically reactive activation energy

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2021年第8期42卷 1191-1204页

作者： J.K.MADHUKESH G.K.RAMESH b.c.prasannakumara S.A.SHEHZAD F.M.AbbASI Department of Mathematics Davangere UniversityDavangere 577007India Department of Mathematics K.L.E.Society’s J.T.CollegeGadag 582101India Department of Mathematics COMSATS University IslamabadSahiwal 57000Pakistan

bioconvection research is primarily focused on the augmentation of energy and mass species,which has implications in the processes intensification,mechanical,civil,electronics,and chemical engineering *** bioconvection technology sectors include cooling systems for electronic devices,building insulation,and geothermal nuclear waste ***,the present investigation is mainly discoursing the impact of Marangoni convention casson nanoliquid flow under gyrotactic microorganisms over the porous *** partial differential equations(PDEs)are re-structured into ordinary differential equations(ODEs)via suitable similar *** ODEs are numerically solved with the help of the spectral relaxation method(SRM).The numerical outcomes are illustrated graphically for various parameters over velocity,temperature,concentration,and bioconvection ***-dimensional(3 D)views of important engineering parameters are illustrated for various *** velocity of the casson nanoliquid increases with increasing the Marangoni parameter but decreases against higher porosity *** surface drag force enhances for enhancement in the Marangoni *** rate of mass transmission is higher for reaction rate constraint but diminishes for activation energy *** higher radiative values augment the rate of heat transmission.

关键词： casson nanofluid activation energy thermal radiation bioconvection Marangoni convection

black hole shadows in Einstein-bel-Robinson gravity

在线全文

学校读者我要写书评

暂无评论

chinese Physics c 2024年第5期48卷 272-283页

作者： b.Hamil b.c.Lütfüoğlu Laboratoire de Physique Mathématique et Subatomique Facultédes Sciences ExactesUniversitéConstantine 1ConstantineAlgeria Department of Physics University of Hradec KrálovéRokitanského 6250003 Hradec KrálovéCzechia

Gravity models given by higher-order scalar curvature corrections are believed to bear important consequences. Einstein-bel-Robinson (EbR) gravity with quartic curvature modification motivated Sajadi et al. to explore static spherically symmetric black hole solutions using perturbative methods. In this study, inspired by their work, we investigate AdS black hole shadows in EbR gravity and demonstrate how the gravity parameter alters the energy emission rate. Finally, we address the same problem in the presence of plasma, because the black holes are thought to be surrounded by a medium that changes the geodesic of photons.

关键词： black hole shadows Einstein-bel-Robinson gravity plasma

Semi-analytical investigation of heat transfer in a porous convective radiative moving longitudinal fin exposed to magnetic field in the presence of a shape-dependent trihybrid nanofluid

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2024年第1期45卷 197-216页

作者： c.G.PAVITHRA b.J.GIREESHA M.L.KEERTHI Department of PG Studies and Research in Mathematics Kuvempu UniversityShankaraghatta 577451India Department of Mathematics and Statistics M.S.Ramaiah University of Applied SciencesBengaluru 560058India

The thermal examination of a non-integer-ordered mobile fin with a magnetism in the presence of a trihybrid nanofluid(Fe_3O_4-Au-Zn-blood) is carried out. Three types of nanoparticles, each having a different shape, are considered. These shapes include spherical(Fe_3O_4), cylindrical(Au), and platelet(Zn) configurations. The combination approach is utilized to evaluate the physical and thermal characteristics of the trihybrid and hybrid nanofluids, excluding the thermal conductivity and dynamic viscosity. These two properties are inferred by means of the interpolation method based on the volume fraction of nanoparticles. The governing equation is transformed into a dimensionless form, and the Adomian decomposition Sumudu transform method(ADSTM) is adopted to solve the conundrum of a moving fin immersed in a trihybrid nanofluid. The obtained results agree well with those numerical simulation results, indicating that this research is reliable. The influence of diverse factors on the thermal overview for varying noninteger values of γ is analyzed and presented in graphical representations. Furthermore, the fluctuations in the heat transfer concerning the pertinent parameters are studied. The results show that the heat flux in the presence of the combination of spherical, cylindrical, and platelet nanoparticles is higher than that in the presence of the combination of only spherical and cylindrical nanoparticles. The temperature at the fin tip increases by 0.705 759% when the value of the Peclet number increases by 400%, while decreases by 11.825 13% when the value of the Hartman number increases by 400%.

关键词： convection radiation moving longitudinal fin Adomian decomposition Sumudu transform method(ADSTM) trihybrid nanofluid magnetic field

Efficient guiding and focusing of intense laser pulse using periodic thin slits

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2024年第4期9卷 29-39页

作者： L.Xu T.W.Huang K.Jiang c.N.Wu H.Peng P.c.hen R.Li H.b.Zhuo c.T.Zhou Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Intense Laser ApplicationTechnologyand College of Engineering PhysicsShenzhen Technology UniversityShenzhen 518118People’s Republic of China

Slits have been widely used in laser-plasma interactions as plasma optical components for generating high-harmonic light and controlling laser-driven particle ***,we propose and demonstrate that periodic thin slits can be regarded as a new breed of optical elements for efficient focusing and guiding of intense laser *** fundamental physics of intense laser interaction with thin slits is studied,and it is revealed that relativistic effects can lead to enhanced laser focusing far beyond the pure diffractive focusing *** addition,the interaction of an intense laser pulse with periodic thin slits makes it feasible to achieve multifold enhancement in both laser intensity and energy transfer efficiency compared with conventional *** results provide a novel method for manipulating ultra-intense laser pulses and should be of interest for many laser-based applications.

关键词： laser pulse intense

Synchronized off-harmonic probe laser with highly variable pulse duration for laser-plasma interaction experiments

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2024年第1期12卷 99-107页

作者： J.Hornung Y.Zobus H.Lorenté c.brabetz b.Zielbauer V.bagnoud GSI Helmholtzzentrum für Schwerionenforschung GmbH DarmstadtGermany Institut d’Optique UniversitéParis-SaclayPalaiseauFrance Institut für Angewandte Physik Technische Universität DarmstadtDarmstadtGermany

This paper presents the development and experimental utilization of a synchronized off-harmonic laser system designed as a probe for ultra-intense laser±plasma interaction experiments. The system exhibits a novel seed-generation design,allowing for a variable pulse duration spanning over more than three orders of magnitude, from 3.45 picoseconds to 10 nanoseconds. This makes it suitable for various plasma diagnostics and visualization techniques. In a side-view configuration, the laser was employed for interferometry and streaked shadowgraphy of a laser-induced plasma while successfully suppressing the self-emission background of the laser±plasma interaction, resulting in a signal-to-self-emission ratio of 110 for this setup. These properties enable the probe to yield valuable insights into the plasma dynamics and interactions at the PHELIX facility and to be deployed at various laser facilities due to its easy-to-implement design.

关键词： interferometry laser-plasma interaction off-harmonic probe laser streaked shadowgraphy