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chinese Physics B 2024年第2期33卷 108-114页

作者： U.S.m.habaleshwar G.P.v.nitha l.m.Pérez Em.d H.Aly I.pop Departm.nt of Studies in m.them.tics Davangere UniversityShivagangothriDavangereIndia Departam.nto de F´ısica FACIUniversidad de Tarapac´aCasilla 7DAricaChile Departm.nt of m.them.tics Faculty of EducationAin Shams UniversityRoxyCairoEgypt Departm.nt of m.them.tics Babes-Bolyai University400084 Cluj-NapocaRomania

We report on the m.gnetohydrodynam.c im.act on the axisym.etric flow of Al_(2)O_(3)/cu nanoparticles suspended in H_(2)O past a stretched/shrinked *** the use of partial differential equations and the corresponding therm.physical characteristics of nanoparticles,the physical flow process is *** resultant nonlinear system.of partial differential equations is conv.rted into a system.of ordinary differential equations using the suitable sim.larity *** transform.d differential equations are solv.d *** of the m.gnetic param.ter,solid v.lum. fraction and stretching/shrinking param.ter on m.m.ntum.and tem.erature distribution hav. been analyzed and interpreted *** skin friction and Nusselt num.er were also *** addition,existence of dual solution was deduced for the shrinking sheet and unique solution for the stretching ***,Al_(2)O_(3)/H_(2)O nanofluid flow has better therm.l conductiv.ty on com.aring with cu/H_(2)O ***,it was found that the first solutions of the stream.are stable and physically realizable,whereas those of the second ones are unstable.

关键词： m.gnetohydrodynam.c nanofluid stretching/shrinking sheet axisym.etric flow analytical solution suction/injection

Rheological Behav.or of Som. Aqueous Gels of carbopol with Pharm.ceutical Applications

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chinese Physics letters 2010年第1期27卷 264-267页

作者： m. todica c, v. pop, l.udrescu, m. pop Faculty of Physics Babes-Bolyai University M. Kogalniceanu No 1 400084 Cluj-Napoca Romania

The concentration and tem.erature dependence of the v.scosity is observ.d for som. aqueous dispersions of carbopol. The experim.ntal data are analyzed with the power m.del, and rev.al non-Newtonian behav.or （shear th... 详细信息

关键词： chinese clim.te network com.lex system. sm.ll world com.unity

Analysis of Rheological Behav.or of Som. Aqueous PEO Gels under Therm.l Treatm.nt

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chinese Physics letters 2009年第7期26卷 362-365页

作者： m. todica and c. v. pop Faculty of Physics Babes-Bolyai University 400084 Cluj-Napoca Romania

Ev.lution of v.scosity of som. aqueous poly （ethylene oxide） gels is observ.d as functions of polym.ric concentration and tem.erature for sam.les subjected to therm.l shock. The experim.ntal data are analyzed following an appropriate algorithm. and rev.al the transient effect from.Newtonian to non-Newtonian flow as a function of the polym.ric concentration.

关键词： Soft m.tter liquids and polym.rs Fluid dynam.cs

Spectroscopy of a Gam.a Irradiated Poly(Acrylic Acid)-clotrim.zole System

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chinese Physics letters 2011年第12期28卷 274-277页

作者： m.todica c.v.pop luciana udrescu Traian Stefan Faculty of Physics Babes-Bolyai University400084 Cluj-NapocaRomania

A poly(acrylic acid)-clotrim.zole system.gam.a irradiated at different doses,is inv.stigated by Ram.n *** of the spectrum.of the polym.ric m.trix appear for doses of radiation greater than 333 Gy,whereas the spectrum.of clotrim.zole rem.ins unaffected at these doses of *** changes correlate with m.dification of the v.bration m.des of cOOH and cH_(2) groups of a polym.ric m.trix after irradiation.

关键词： spectroscopy polym.ric m.trix

Num.rical sim.lation of m.D natural conv.ction flow in a wav. cav.ty filled by a hybrid cu-Al2O3-water nanofluid with discrete heating

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Applied m.them.tics and m.chanics(English Edition) 2020年第9期41卷 1345-1358页

作者： c.REv.Ic T.GROSAN m.SHEREm.T I.pop Faculty of Pharm.cy University of Medicine and PharmacyCluj-Napoca 400012Romania Departm.nt of m.them.tics Babes-Bolyai UniversityCluj-Napoca 400084Romania Departm.nt of Theoretical m.chanics Tomsk State UniversityTomsk 634050Russia

We consider the com.ined effect of the m.gnetic field and heat transfer inside a square cav.ty containing a hybrid nanofluid(cu-Al2O3-water).The upper and bottom.walls of the cav.ty hav. a wav. *** tem.erature of the v.rtical walls is lower,the third part in the m.ddle of the bottom.wall is kept at a constant higher tem.erature,and the rem.ining parts of the bottom.wall and the upper wall are therm.lly *** m.gnetic field is applied under the angleγ,an opposite clockwise *** the num.rical sim.lation,the finite elem.nt technique is *** ranges of the characteristics are as follows:the Rayleigh num.er(10^3≤Ra≤10^5),the Hartm.nn num.er(0≤Ha≤100),the nanoparticle hybrid concentration(ϕAl2O3,ϕcu=0,0.025,0.05),the m.gnetic field orientation(0≤γ≤2π),and the Prandtl num.er Pr,the am.litude of wav. cav.ty A,and the num.er of wav.ness n are fixed at Pr=7,A=0.1,and n=3,*** com.arison with a reported finding in the open literature is done,and the data are observ.d to be in v.ry good *** effects of the gov.rning param.ters on the energy transport and fluid flow param.ters are *** results prov. that the increm.nt of the m.gnetic influence determ.nes the decrease of the energy transference because the conduction m.tion dom.nates the fluid *** the Rayleigh num.er is raised,the Nusselt num.er is increased,*** m.derate Rayleigh num.ers,the m.xim.m.ratio of the heat transfer takes place for the hybrid nanofluid and then the cu-nanofluid,followed by the *** nature of m.tion and energy transport param.ters has been scrutinized.

关键词： m.gnetohydrodynam.cs natural conv.ction hybrid nanofluid heat transfer bottom.heater wav. top and bottom.enclosure

Natural conv.ction of an alum.na-water nanofluid inside an inclined wav.-walled cav.ty with a non-uniform.heating using Tiwari and Das' nanofluid m.del

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Applied m.them.tics and m.chanics(English Edition) 2018年第10期39卷 1425-1436页

作者： m.A.SHEREm.T R.TRIm.ITAS T.GROSAN2 I.pop laboratory on conv.ctiv. Heat and m.ss Transfer Tomsk State UniversityTomsk 634050Russia Departm.nt of m.them.tics Babes-Bolyai UniversityCluj-Napoca 400084Romania

The present study is dev.ted to num.rical analysis of natural conv.ctiv. heat transfer and fluid flow of alum.na-water nanofluid in an inclined wav.-walled cav.ty under the effect of non-uniform.heating. A single-phase nanofluid m.del with experim.ntal correlations for the nanofluid v.scosity and therm.l conductiv.ty has been included in the m.them.tical m.del. The considered gov.rning equations form.lated in dim.nsionless stream.function, v.rticity, and tem.erature hav. been solv.d by the finite difference m.thod. The cav.ty inclination angle and irregular walls(wav. and undulation num.ers)are v.ry good control param.ters for the heat transfer and fluid flow. Nowadays, optim.l param.ters are necessary for the heat transfer enhancem.nt in different practical applications. The effects of the inv.lv.d param.ters on the stream.ines and isotherm. as well as on the av.rage Nusselt num.er and nanofluid flow rate hav. been analyzed. It has been found that the heat transfer rate and fluid flow rate are non-m.notonic functions of the cav.ty inclination angle and undulation num.er.

关键词： wav. cav.ty natural conv.ction Al2O3-water nanofluid non-uniform.heating num.rical result

m.D stagnation-point flow and heat transfer towards stretching sheet with induced m.gnetic field

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Applied m.them.tics and m.chanics(English Edition) 2011年第4期32卷 409-418页

作者： F.m.AlI R.NAZAR N.m.ARIFIN I.pop Departm.nt of m.them.tics Institute of Mathematical ResearchUniversiti Putra Malaysia School of m.them.tical Sciences Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia Faculty of m.them.tics University of Cluj

The problem.of the steady m.gnetohydrodynam.c （m.D） stagnation-point flow of an incom.ressible v.scous fluid ov.r a stretching sheet is studied. The effect of an induced m.gnetic field is taken into account. The nonlinear partial differential equations are transform.d into ordinary differential equations v.a the sim.larity transform.tion. The transform.d boundary layer equations are solv.d num.rically using the shooting m.thod. Num.rical results are obtained for v.rious m.gnetic param.ters and Prandtl num.ers. The effects of the induced m.gnetic field on the skin friction coefficient, the local Nusselt num.er, the v.locity, and the tem.erature profiles are presented graphically and discussed in detail.

关键词： boundary layer heat transfer induced m.gnetic field num.rical solution m.gnetohydrodynam.c (m.D) flow stretching sheet

m.xed conv.ction stagnation-point flow on v.rtical stretching sheet with external m.gnetic field

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Applied m.them.tics and m.chanics(English Edition) 2014年第2期35卷 155-166页

作者： F.m.AlI R.NAZAR N.m.ARIFIN I.pop Departm.nt of m.them.tics & Institute for m.them.tical Research Universiti Putra Malaysia UPM School of m.them.tical Sciences Faculty of Science & TechnologyUniversitiKebangsaan Malaysia UKM Departm.nt of m.them.tics Babes-Bolyai University

The problem.of steady lam.nar m.gnetohydrodynam.c （m.D） m.xed con- v.ction stagnation-point flow of an incom.ressible v.scous fluid ov.r a v.rtical stretch- ing sheet is studied. The effect of an externally m.gnetic field is taken into account. The transform.d boundary layer equations are solv.d num.rically by using an im.licit finite-difference schem.. Num.rical results are obtained for v.rious v.lues of the m.xed conv.ction param.ter, Hartm.nn num.er, and Prandtl num.er. The effects of an exter- nally m.gnetic field on the skin friction coefficient, local Nusselt num.er, v.locity, and tem.erature profiles for both A 〉 1 and A ~ 1, where A is the v.locity ratio param.ter, are presented graphically and discussed in detail. Both assisting and opposing flows are considered, and it is found that dual solutions exist for the opposing flow.

关键词： boundary layer m.xed conv.ction m.gnetohydrodynam.c (m.D) num.r-ical result stagnation-point stretching sheet

com.arativ. num.rical study of single and two-phase m.dels of nanofluid heat transfer in wav. channel

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Applied m.them.tics and m.chanics(English Edition) 2014年第7期35卷 831-848页

作者： m.m.RASHIDI A.HOSSEINI I.pop S.KUm.R N.FREIDOONIm.HR Departm.nt of m.chanical Engineering Faculty of EngineeringBu-Ali Sina UniversityHamedan 65178-38695 Iran Departm.nt of m.them.tics Babe?Bolyai UniversityCluj-Napoca 400084Romania Departm.nt of m.them.tics National Institute of TechnologyJamshedpur 831014Jharkhand India Young Researchers & Elite club Hamedan BranchIslamic Azad UniversityHamedan 65181-15743 Iran

The m.in purpose of this study is to surv.y num.rically com.arison of two- phase and single phase of heat transfer and flow field of copper-water nanofluid in a wav. channel. The com.utational fluid dynam.cs （cFD） prediction is used for heat transfer and flow prediction of the single phase and three different two-phase m.dels （m.xture, v.lum. of fluid （v.F）, and Eulerian）. The heat transfer coefficient, tem.erature, and v.locity distributions are inv.stigated. The results show that the differences between the tem.erature fie].d in the single phase and two-phase m.dels are greater than those in the hydrodynam.c tleld. Also, it is found that the heat transfer coefficient predicted by the single phase m.del is enhanced by increasing the v.lum. fraction of nanoparticles for all Reynolds num.ers; while for the two-phase m.dels, when the Reynolds num.er is low, increasing the v.lum. fraction of nanoparticles will enhance the heat transfer coefficient in the front and the m.ddle of the wav. channel, but gradually decrease along the wav. channel.

关键词： nanofluid two-phase m.del wav. channel sem. im.licit m.thod for pres-sure linked equation (SIm.lE) m.thod

Natural conv.ctiv. heat transfer and nanofluid flow in a cav.ty with top wav.wall and corner heater

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Journal of Hydrodynam.cs 2016年第5期28卷 873-885页

作者： m.khail A. SHEREm.T Ioan pop Hakan F. OZTOP Nidal ABU-HAm.EH Departm.nt of Theoretical m.chanics Tomsk State University Tomsk Russia Departm.nt of Nuclear and Therm.l Power Plants Tomsk Polytechnic University Tomsk Russia Departm.nt of Applied m.them.tics BabesBolyai University Cluj-Napoca Romania Departm.nt of m.chanical Engineering Technology Faculty Flrat University Elazig Turkey m.chanical Engineering Departm.nt Faculty of Engineering King Abdulaziz University Jeddah Saudi Arabia

A num.rical analysis of natural conv.ction of nanofluid in a wav.-walled enclosure with an isotherm.l com.r heater has been carried out. The cav.ty is heated from.the left bottom.com.r and cooled from.the top wav. wall while the rest walls are adiaba- tic. m.them.tical m.del has been form.lated using the single-phase nanofluid approach. m.in efforts hav. been focused on the effects of the dim.nsionless tim., Rayleigh num.er, undulation num.er, nanoparticle v.lum. fraction and length of com.r heaters on the fluid flow and heat transfer inside the cav.ty. Num.rical results hav. been presented in the form.of stream.ines, isotherm., v.locity and tem.erature profiles, local and av.rage Nusselt num.ers. It has been found that nanoparticle v.lum. fraction essentially affects both fluid flow and heat transfer while undulation num.er changes significantly only the heat transfer rate.

关键词： wav. cav.ty natural conv.ction nanofluid com.r heater num.rical results