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Investigation of Coulom. force effects on ethylene glycol based nanofluid lam.nar flow in a porous enclosure

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Applied m.them.tics and m.chanics(English Edition) 2018年第9期39卷 1341-1352页

作者： m.sheikholeslami Departm.nt of m.chanical Engineering Babol Noshirvani University of Technology

Forced convection heat transfer of ethylene glycol based nanofluid with FeOinside a porous m.dium.is studied using the electric field. The control volum. based finite elem.nt m.thod(CVFEm. is selected for num.rical sim.lation. The im.act of the radiation param.ter(R), the supplied voltage(?φ), the volum. fraction of nanofluid(?), the Darcy num.er(Da), and the Reynolds num.er(Re) on nanofluid treatm.nt is dem.nstrated. Results prove that therm.l radiation increases the tem.erature gradient near the positive electrode. Distortion of isotherm. increases with the enhance of the Darcy num.er and the Coulom. force.

关键词： control volum. based finite elem.nt m.thod(CVFEm. porous m.dium Coulom. force nanofluid therm.l radiation electric field

TiO_2-water nanofluid in a porous channel under the effects of an inclined m.gnetic field and variable therm.l conductivity

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Applied m.them.tics and m.chanics(English Edition) 2018年第8期39卷 1201-1216页

作者： A.A.SIDDIQUI m.sheikholeslami Departm.nt of Basic Sciences Bahauddin Zakariya University Departm.nt of m.chanical Engineering Babol Noshirvani Uiniversity of Technology

The TiO2-water based nanofluid flow in a channel bounded by two porous plates under an oblique m.gnetic field and variable therm.l conductivity is form.lated as a boundary-value problem.BVP). The BVP is analytically solved with the hom.topy analysis m.thod(HAm.. The result shows that the concentration of the nanoparticles is independent of the volum. fraction of TiO2nanoparticles, the m.gnetic field intensity, and the angle. It is inversely proportional to the m.ss diffusivity. The fluid speed decreases whereas the tem.erature increases when the volum. fraction of the TiO2nanoparticles increases. This confirm. the fact that the occurrence of the TiO2nanoparticles results in the increase in the therm.l transfer rate. The fluid speed decreases and the tem.erature increases for both the pure water and the nanofluid when the m.gnetic field intensity and angle increase. The m.xim.m.velocity does not exist at the m.ddle of the sym.etric channel, which is in contrast to the plane-Poiseuille flow, but it deviates a little bit towards the lower plate, which absorbs the fluid with a very low suction velocity. If this suction velocity is increased, the tem.erature in the vicinity of the lower plate will be *** explicit expression for the friction factor-Reynolds num.er is then developed. It is shown that the Hartm.nn num.er of the nanofluid is sm.ller than that of pure water,while the Nusselt num.er of the nanofluid is larger than that of pure water. However,both the param.ters increase if the m.gnetic field intensity increases.

关键词： TiO2 Nusselt num.er oblique m.gnetic field nanofluid hom.topy analysis m.thod(HAm. therm.l transfer

Effect of Lorentz forces on forced-convection nanofluid flow over a stretched surface

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Particuology 2016年第3期14卷 108-113页

作者： m.hsen sheikholeslami m.T. m.stafa Davood Dom.ri Ganji Departm.nt of m.chanical Engineering Babol University of Technology Babol Islamic Republic oflran Departm.nt of m.them.tics Statistics and Physics Qatar University Doha 2713 Qatar

m.gnetic nanofiuid hydrotherm.l analysis over a plate is studied that includes consideration of therm.l radiation. The Runge-Kutta （RK4） m.thod is utilized to get solution of ODEs which are obtained from.sim.larity solution. In considering the im.acts of Brownian m.tion, we applied Koo-Kleinstreuer-Li cor- relation to sim.late the properties of CuO-water. The influence is discussed of im.ortant param.ters such as the tem.erature index, m.gnetic, radiation, and velocity ratio param.ters and volum. fraction of nanoparticle on hydrotherm.l behavior. Results illustrate that the coefficient of skin friction enhances with enhancing m.gnetic param.ter while reduces with enhancing velocity ratio param.ter. Also the Nusselt num.er was found to directly depend on the velocity ratio and tem.erature index param.ters but has an inverse dependence on the m.gnetic and radiation param.ters.

关键词： Nanofluid Brownian m.tion Therm.l radiation m.gnetohydrodynam.c Stretching sheet

Num.rically sim.lated behavior of radiative Fe_(3)O_(4) and m.lti-walled carbon nanotube hybrid nanoparticle flow in presence of Lorentz force

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Applied m.them.tics and m.chanics(English Edition) 2021年第3期42卷 347-356页

作者： S.A.SHEHZAD m.sheikholeslami T.Am.REEN A.SHAFEE Departm.nt of m.them.tics COMSATS University IslamabadSahiwal 57000Pakistan Renewable Energy System. and Nanofluid Applications in Heat Transfer Laboratory Babol Noshirvani University of TechnologyBabol 47148-71167Iran Departm.nt of m.chanical Engineering Babol Noshirvani University of TechnologyBabol 47148-71167Iran School of m.chanical Engineering Kyungpook National UniversityDaegu 41566South Korea Institute of Research and Developm.nt Duy Tan UniversityDa Nang 550000Vietnam

Free convection in hybrid nanom.terial-saturated perm.able m.dia is crucial in various engineering *** present study aim. to investigate the free convection of an aqueous-based hybrid nanom.terial through a zone under the com.ined effect of the Lorentz force and *** natural convection of the hybrid nanom.terial is m.deled by im.lem.nting a control volum. finite elem.nt m.thod(CVFEm.-based code,whereas Darcy assum.tions are used to m.del the porosity term. in the m.m.ntum.buoyancy equation involving the average Nusselt num.er Nu_(ave),flow stream.ines,and isotherm.profiles.A form.la for estim.ting Nu_(ave) is *** results show that the m.gnetic force retards the flow,and the fluid tends to attract the m.gnetic field ***_(ave) is directly correlated with the Rayleigh num.er and radiation;however,it is indirectly dependent on the Hartm.nn *** is the dom.nant m.de at larger Darcy and Hartm.nn num.ers.

关键词： free convection hybrid nanoparticle Darcy porous space Hartm.nn num.er radiation

Free convection of nanofluid filled enclosure using lattice Boltzm.nn m.thod (LBm.

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Applied m.them.tics and m.chanics(English Edition) 2013年第7期34卷 833-846页

作者： m.sheikholeslami m.GORJI-BANDPY G.DOm.IRRY Departm.nt of m.chanical Engineering Babol Noshirvani University of Technology

The lattice Boltzm.nn m.thod （LBm. is used to exam.ne free convection of nanofluids. The space between the cold outer square and heated inner circular cylinders is filled with water including various kinds of nanoparticles： TiO2, Ag, Cu, and A1203. The Brinkm.n and m.xwell-Garnetts m.dels are used to sim.late the viscosity and the effective therm.l conductivity of nanofluids, respectively. Results from.the perform.d num.rical analysis show good agreem.nt with those obtained from.other num.rical m.th- ods. A variety of the Rayleigh num.er, the nanoparticle volum. fraction, and the aspect ratio are exam.ned. According to the results, choosing copper as the nanoparticle leads to obtaining the highest enhancem.nt for this problem. The results also indicate that the m.xim.m.value of enhancem.nt occurs at λ =2.5 when Ra = 106 while at A = 1.5 for other Rayleigh num.ers.

关键词： lattice Boltzm.nn m.thod (LBm. nanofluid natural convection concentric annular cavity

Natural Convection of Fe_3O_4-Ethylene Glycol Nanofluid under the Im.act of Electric Field in a Porous Enclosure

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Com.unications in Theoretical Physics 2018年第6期69卷 667-675页

作者： m.sheikholeslami S.A.Shehzad R.Kum.r Departm.nt of m.chanical Engineering Babol Noshirvani University of Technology Departm.nt of m.them.tics COMSATS Institute of Information Technology Departm.nt of m.them.tics Central University of Himachal Pardesh

Free convection of FeaO4-Ethylene glycol nanofluid in existence of Coulom. forces is studied. Effect of therm.l radiation is taken into account. Properties of nanofluid are varied with supplied voltage and shape of nanoparticles. The bottom.wall is considered as positive electrode. Control Volum. based Finite Elem.nt m.thod is used to obtain the results, which are the roles of Darcy num.er （Da）, radiation param.ter （Rd）, Rayleigh num.er （Ra）, nanofluid volum. fraction （qS）, and supplied voltage （△φ）. Results indicate that Nusselt num.er is an enhancing function of supplied voltage and Darcy num.er. m.xim.m.values for tem.erature gradient are occurred for platelet shape nanoparticles.

关键词： electric field therm.l radiation nanofluid shape of nanoparticles porous m.dia

Analytical investigation of Jeffery-Ham.l flow with high m.gnetic field and nanoparticle by Adom.an decom.osition m.thod

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Applied m.them.tics and m.chanics(English Edition) 2012年第1期33卷 25-36页

作者： m.sheikholeslami D.D.GANJI H.R.ASHORYNEJAD H.B.ROKNI Faculty of m.chanical Engineering Babol University of TechnologyP.O.Box 484BabolIslamic Republic of Iran

In this study, the effects of m.gnetic field and nanoparticle on the Jeffery- Ham.l flow are studied using a powerful analytical m.thod called the Adom.an decom.osition m.thod （ADm.. The traditional Navier-Stokes equation of fluid m.chanics and m.xwell＇s electrom.gnetism.governing equations are reduced to nonlinear ordinary differential equations to m.del the problem. The obtained results are well agreed with that of the Runge-Kutta m.thod. The present plots confirm.that the m.thod has high accuracy for different a, Ha, and Re num.ers. The flow field inside the divergent channel is studied for various values of Hartm.nn ：num.er and angle of channel. The effect of nanoparticle volum. fraction in the absence of m.gnetic field is investigated.

关键词： m.gnetohydrodynam.c Jeffery-Ham.l flow Adom.an decom.osition m.thod nonlinear ordinary differential equation nanofluid

Non-Newtonian fluid flow in an axisym.etric channel with porous wall

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Propulsion and Power Research 2013年第4期2卷 254-262页

作者： m.Hosseini Z.sheikholeslami D.D.Ganji Departm.nt of m.chanical Engineering Islamic Azad UniversityQaemshahr BranchQaemshahrMazandaranIran Departm.nt of Civil Engineering University of MazandaranBabolsarIran Departm.nt of m.chanical Engineering Babol University of TechnologyBabolIran

In the present article Optim.l Hom.topy Asym.totic m.thod(OHAm.is used to obtain the solutions of m.m.ntum.and heat transfer equations of non-Newtonian fluid flow in an axisym.etric channel with porous wall for turbine cooling *** m.thod is used for validity of this analytical m.thod and excellent agreem.nt is observed between the solutions obtained from.OHAm.and num.rical *** to this validity,effects of som. other param.ters are *** results show that Nusselt num.er increases with increase of Reynolds num.er,Prandtl num.er and power law index.

关键词： Non-Newtonian fluid Axisym.etric channel Porous m.dia Optim.l Hom.topy Asym.totic m.thod(OHAm. Heat transfer

Signed (b,k)-Edge Covers in Graphs

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Intelligent Inform.tion m.nagem.nt 2010年第2期2卷 143-148页

作者： A. N. Gham.shlou A. Khodkar R. Saei S.m. sheikholeslami 不详

Let be a sim.le graph with vertex set and edge set . Let have at least vertices of degree at least , where and are positive integers. A function is said to be a signed -edge cover of if for at least vertices of , where . The value , taking over all signed -edge covers of is called the signed -edge cover num.er of and denoted by . In this paper we give som. bounds on the signed -edge cover num.er of graphs.

关键词： Signed Star Dom.nating Function Signed Star Dom.nation Num.er Signed -edge Cover Signed -edge Cover Num.er