检索结果-南通市图书馆

Applied Mathematics and Mechanics(English Edition) 2024年第3期45卷 563-580页

作者： N.HUMNEKAR D.SRINIVASACHARYA Department of Mathematics National Institute of TechnologyWarangal 506004TelanganaIndia

The influence of variable viscosity and double diffusion on the convective stability of a nanofluid flow in an inclined porous channel is *** DarcyBrinkman model is used to characterize the fluid flow dynamics in porous *** analytical solutions are obtained for the unidirectional and completely developed *** on a normal mode analysis,the generalized eigenvalue problem under a perturbed state is *** eigenvalue problem is then solved by the spectral ***,the critical Rayleigh number with the corresponding wavenumber is evaluated at the assigned values of the other flow-governing *** results show that increasing the Darcy number,the Lewis number,the Dufour parameter,or the Soret parameter increases the stability of the system,whereas increasing the inclination angle of the channel destabilizes the ***,the flow is the most unstable when the channel is vertically oriented.

关键词： nanofluid inclined channel variable viscosity linear stability double dif-fusion porous medium

variable viscosity effects on the flow of MHD hybrid nanofluid containing dust particles over a needle with Hall current——a Xue model exploration

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2022年第5期74卷 121-131页

作者： Muhammad Ramzan Hammad Alotaibi Department of Computer Science Bahria UniversityIslamabad44000Pakistan Department of Mathematics College of ScienceTaif UniversityPOBox 11099Taif 21944Saudi Arabia

This study scrutinizes the flow of engine oil-based suspended carbon nanotubes magnetohydrodynamics(MHD)hybrid nanofluid with dust particles over a thin moving needle following the Xue *** analysis also incorporates the effects of variable viscosity with Hall *** heat transfer analysis,the effects of the Cattaneo–Christov theory and heat generation/absorption with thermal slip are integrated into the temperature *** Tiwari–Das nanofluid model is used to develop the envisioned mathematical *** similarity transformation,the governing equations for the flow are translated into ordinary differential *** bvp4c method based on Runge–Kutta is used,along with a shooting *** are used to examine and depict the consequences of significant parameters on involved *** results revealed that the temperature of the fluid and boundary layer thickness is diminished as the solid volume fraction is ***,with an enhancement in the variable viscosity parameter,the velocity distribution becomes more *** results are substantiated by assessing them with an available study.

关键词： hybrid nanofluid dusty fluid variable viscosity Cattaneo-Christov heat flux model Hall current

The effect of variable viscosity on the flow and heat transfer of a viscous Agwater and Cu-water nanofluids

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2013年第1期25卷 1-9页

作者： VAJRAVELU Kuppalapalle PRASAD Kerehalli Vinayaka NG Chiu-On Department of Mathematics University of Central Florida Department of Mathematics VSK University Department of Mechanical Engineering The University of Hong Kong

A numerical study is carried out to study the effects of the temperature dependent viscosity on the flow and heat transfer of a nanofluid over a flat surface in the presence of viscous dissipation. The governing nonlinear partial differential equations are transformed into nonlinear ordinary differential equations, and are solved numerically by the Keller-box method. The numerical results indicate that the effect of nanoparticle volume fraction is to increase the heat transfer and hence enhance the thermal boundary layer thickness. This is true even in the presence of variable viscosity and the viscous dissipation. Furthermore, the results obtained for heat transfer characteristics with nanoparticles reveal many interesting behaviors that warrant further study on the effects of the ＂nano-solid-particles＂.

关键词： nanofluid particles variable viscosity boundary layers viscous dissipation Keller-box method

Irreversibility analysis of unsteady couette flow with variable viscosity

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2015年第2期27卷 304-310页

作者： EEGUNJOBI A.S. MAKINDE O.D. TSHEHLA M.S. FRANKS O. Department of Mathematics and Statistics Namibia University of Science and Technology Faculty of Military Science Stellenbosch University Faculty of Engineering Built Environment and Information Technology Nelson Mandela Metropolitan University Faculty of Military Science Stellenbosch University

This paper investigates numerically the inherent irreversibility in unsteady generalized Couette flow between two parallel plates with variable viscosity. The nonlinear governing equations are derived from the Navier-Stokes equations and solved numerically using a semi-discretization finite difference method together with the Runge-Kutta-Fehlberg integration scheme. The profiles of velocity and the temperature obtained are used to compute the entropy generation number, Bejan number, skin friction and Nusselt number. The effects of embedded parameters on entire flow structure are presented graphically and discussed quantitatively.

关键词： parallel plates variable viscosity heat transfer Couette flow entropy generation

A Clot Model Examination: with Impulsion of Nanoparticles under Influence of variable viscosity and Slip Effects

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2017年第11期67卷 667-677页

作者： S.Ijaz Iqra Shahzadi S.Nadeem Anber Saleem Department of Mathematics Faculty of Sciences HITEC University Department of Mathematics Quaid-i-Azam University Islamabad Medical and Dental College

In this speculative analysis, our main focused is to address the neurotic condition that occurs due to accumulation of blood components on the wall of the artery that results in blood coagulation. Specifically, to perceive this phenomena clot model is considered. To discuss this analysis mathematical model is formed in the presence of the effective thermal conductivity and variable viscosity of base fluid. Appropriate slip conditions are employed to obtain the close form solutions of temperature and velocity profile. The graphical illustrations have been presented for the assessment of pressure rise, pressure gradient and velocity profile. The effects of several parameters on the flow quantities for theoretical observation are investigated. At the end, the results confirmed that the impulsion of copper and silver nanoparticles as drug agent enlarges the amplitude of the velocity and hence nanoparticles play an important role in engineering and biomedical applications such as drug delivery system.

关键词： variable viscosity metallic nanoparticles slip effects clot model exact solution

Nonlinear free thermal convection in a spherical shell:A variable viscosity model

在线全文

学校读者我要写书评

暂无评论

Acta Seismologica Sinica(English Edition) 2005年第2期18卷 206-217页

作者：朱涛冯锐 Institute of Geophysics China Earthquake AdministrationBeijing100081ChinaLanzhou Institure of SeismologyChina Earthquake AdministrationLanzhou730000China Institute of Geophysics China Earthquake AdministrationBeijing100081China

In mantle convection models, the mantle viscosity is generally assumed constant or dependent on depth. In this paper, a laterally variable viscosity is introduced into mantle convection model in which the mantle viscosity consists of a constant background and latitude-dependent viscosity with small fluctuations. The features of toroidal field dependent on depth and Rayleigh number are discussed under two boundary conditions, i.e., the top rigid and bottom stress-free boundaries (R-F boundary for short) and both rigid ones (R-R boundary for short), respectively. The results show that the energy of toroidal field mainly concentrates in the middle and upper parts of a spherical shell, and the ratio of toroidal to total velocities amounts to only a few percents and hardly depends on Rayleigh number, while the convection patterns of toroidal field have been strongly affected by Rayleigh number. It is found that the convection patterns and velocities of toroidal field have obvious differences in latitudinal direction, which clearly reflects the effects of lateral mantle viscosity variations on the convection patterns. These preliminary results give us a possible hint to study some global tectonic phenomena, e.g. the asymmetry of the southern and northern hemispheres and the Earth's differential rotation.

关键词： variable viscosity thermal free convection nonlinear the component of toroidal field

Simulation of variable viscosity and Jeffrey Fluid Model for Blood Flow Through a Tapered Artery with a Stenosis

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2012年第1期57卷 133-140页

作者： Noreen Sher Akbar S.Nadeem Department of Mathematics Quaid-i-Azam University 45320Islamabad 44000Pakistan Department of Mathematics&Natural Sciences Prince Mohammad Bin Fahd UniversityP.O.Box 1664Al Khobar 31952Kingdom of Saudi Arabia

Non-Newtonian fluid model for blood flow through a tapered artery with a stenosis and variable viscosity by modeling blood as Jeffrey fluid has been studied in this paper. The Jeffrey fluid has two parameters, the relaxation time A1 and retardation time A2. The governing equations are simplified using the case of mild stenosis. Perturbation method is used to solve the resulting equations. The effects of non-Newtonian nature of blood on velocity profile, temperature profile, wall shear stress, shearing stress at the stenotsis throat and impedance of the artery are discussed. The results for Newtonian fluid are obtained as special case from this model.

关键词： Jeffrey two constant fluid model blood flow tapered artery stenosis variable viscosity analyticalsolution

Analytical Treatment of an Oldroyd 8-constant Fluid Between Coaxial Cylinders with variable viscosity

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2011年第11期56卷 933-938页

作者： Muhammad Yousaf Malik Azad Hussain Sohail Nadeem Department of Mathematics Quaid-i-Azam University

The flow of an Oldroyd 8-constant fluid between coaxial cylinders with variable viscosity is *** heat transfer analysis is also taken into *** analytical solution of the non-linear problem is obtained usinghomotopy an... 详细信息

关键词： variable viscosity analytical solution heat transfer

Inclined magnetic field and variable viscosity effects on bioconvection of Casson nanofluid slip flow over non linearly stretching sheet

在线全文

学校读者我要写书评

暂无评论

Propulsion and Power Research 2022年第4期11卷 565-574页

作者： Noman Sarwar Muhammad Imran Asjad Sajjad Hussain Md.Nur Alam Mustafa Inc Department of Mathematics University of Management and TechnologyLahore54770Pakistan School of Aerospace and Mechanical Engineering Nanyang Technological University639798Singapore Department of Mathematics Pabna University of Science and TechnologyPabna-6600Bangladesh Department of Mathematics Science FacultyFirat University23119ElazigTurkey

In pursuit of improved thermal transportation,the slip flow of Casson nanofluid is considered in the existence of an inclined magnetic field and radiative heat flux flow over a nonlinear stretching *** viscosity of the fluid is considered as a function of temperature along with the convective thermal boundary *** solutions are obtained via Runge-Kutta along with the shooting technique method for the chosen boundary values *** see the physical insights of the problem,some graphs are plotted for various flow and embedded parameters on temperature function,micro-organism distribution,velocity,and volume fraction of nanoparticles.A decline is observed in the velocity and the temperature for Casson *** and Brownian motion incremented the temperature *** is also found that thermal transportation can be enhanced in the presence of nanoparticles and the bioconvection of *** results are useful in the various sectors of engineering and for heat exchangers working in various technological *** main findings of the problem are validated and compared with those in the existing literature as a limiting case.

关键词： variable viscosity Bioconvection Inclined field Casson fluid Nonlinearly Stretching sheet Convective boundary Velocity slip Varying viscosity

Group solution for an unsteady non-Newtonian Hiemenz flow with variable fluid properties and suction/injection

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

Chinese Physics B 2014年第9期23卷 43-53页

作者： H.M.El-Hawary Mostafa A.A.Mahmoud Reda G.Abdel-Rahman Abeer S.Elfeshawey Department of Mathematics Faculty of ScienceAssuit University Department of Mathematics Faculty of ScienceBenha University

The theoretic transformation group approach is applied to address the problem of unsteady boundary layer flow of a non-Newtonian fluid near a stagnation point with variable viscosity and thermal conductivity. The application of a two- parameter group method reduces the number of independent variables by two, and consequently the governing partial differential equations with the boundary conditions transformed into a system of ordinary differential equations with the appropriate corresponding conditions. Two systems of ordinary differential equations have been solved numerically using a fourth-order Runge-Kutta algorithm with a shooting technique. The effects of various parameters governing the problem are investigated.

关键词： non-Newtonian fluid stagnation point two-parameter group method variable viscosity