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Peristaltic Flow of Shear Thinning Fluid via Temperature-Dependent Viscosity and Thermal Conductivity

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Communications in Theoretical Physics 2019年第4期71卷 367-376页

作者： S.Noreen A.malik m.m.rashidi Department of mathematics COMSATS University Islamabad Shanghai Automotive Wind Tunnel Center Tongji University

In this paper Williamson ?uid is taken into account to study its peristaltic ?ow with heat effects. The study is carried out in a wave frame of reference for symmetric channel. Analysis of heat transfer is accomplished by accounting the effects of non-constant thermal conductivity and viscosity and viscous dissipation. modeling of fundamental equations is followed by the construction of closed form solutions for pressure gradient, stream function and temperature while assuming Reynold's number to be very low and wavelength to be very long. Double perturbation technique is employed, considering Weissenberg number and variable ?uid property parameter to be very small. The effects of emerging parameters on pumping, trapping, axial pressure gradient, heat transfer coe?cient, pressure rise,velocity pro?le and temperature are analyzed through the graphical representation. A direct relation is observed between temperature and thermal conductivity whereas the indirect proportionality with viscosity. The heat transfer coe?cient is lower for a ?uid with variable thermal conductivity and variable viscosity as compared to the ?uid with constant thermal conductivity and constant viscosity.

关键词： temperature-dependent viscosity temperature-dependent thermal conductivity shear thinningfluid peristalsis

Hydromagnetic rotating flow of third grade fluid

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Applied mathematics and mechanics(English Edition) 2013年第12期34卷 1481-1494页

作者： T.HAYAT R.NAZ A.ALSAEDI m.m.rashidi Department of mathematics Quaid-i-Azam University Department of mathematics King Abdulaziz University Geni mecanique Universite de Sherbrooke

This work investigates the flow of a third grade fluid in a rotating frame of reference. The fluid is incompressible and magnetohydrodynamic （mHD）. The flow is bounded between two porous plates, the lower of which is shrinking linearly. mathematical modelling of the considered flow leads to a nonlinear problem. The solution of this nonlinear problem is computed by the homotopy analysis method （HAm）. Graphs are presented to demonstrate the effect of several emerging parameters, which clearly describe the flow characteristics.

关键词： third grade fluid shrinking sheet rotating frame magnetohydrodynamic(mHD) flow

Axisymmetric Powell-Eyring fluid flow with convective boundary condition: optimal analysis

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Applied mathematics and mechanics(English Edition) 2016年第7期37卷 919-928页

作者： T.HAYAT S.mAKHDOOm m.AWAIS S.SALEEm m.m.rashidi Department of mathematics Quaid-i-Azam University Department of mathematics COMSATS Institute of Information Technology Department of mathematics Statistics and Physics Qatar University Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal management Systems Tongji University

The effects of axisymmetric flow of a Powell-Eyring fluid over an impermeable radially stretching surface are presented. Characteristics of the heat transfer process are analyzed with a more realistic condition named the convective boundary condition. Governing equations for the flow problem are derived by the boundary layer approximations. The modeled highly coupled partial differential system is converted into a system of ordinary differential equations with acceptable similarity transformations. The convergent series solutions for the resulting system are constructed and analyzed. Optimal values are obtained and presented in a numerical form using an optimal homotopy analysis method （OHAm）. The rheological characteristics of different parameters of the velocity and temperature profiles are presented graphically. Tabular variations of the skin friction coefficient and the Nusselt number are also calculated. It is observed that the temperature distribution shows opposite behavior for Prandtl and Biot numbers. Furthermore, the rate of heating/cooling is higher for both the Prandtl and Biot numbers.

关键词： axisymmetric flow optimal homotopy analysis method (OHAm) analysis,convective boundary condition

Study of heat and mass transfer with Joule heating on magnetohydrodynamic(mHD)peristaltic blood flow under the influence of Hall effect

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Propulsion and Power Research 2017年第3期6卷 177-185页

作者： m.m.Bhatti m.m.rashidi Shanghai Institute of Applied mathematics and mechanics Shanghai UniversityShanghai 200072China Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal management Systems Tongji UniversityShanghai 201804China ENN-Tongji Clean Energy Institute of Advanced Studies Shanghai 200072China

In this article,heat and mass transfer with Joule heating on magnetohydrodynamic(mHD)peristaltic blood under the influence of Hall effect is *** modelling is based on momentum,energy and concentration which are taken into account using ohms *** governing partial differential equations are further simplified by neglecting the inertial forces and long wavelength *** solutions have been presented for velocity,temperature and concentration *** influence of all the physical pertinent parameters is taken into account with the help *** is found that Hartmann number and Hall parameter shows opposite behaviour on velocity,temperature and concentration *** is worth mentioning that pressure rise also depicts opposite behaviour for Hartmann number and Hall *** present analysis is also presented for Newtonian fluid(α→0)as a special case for our *** is observed that Hall Effect and magnetic field shows opposite behaviour on velocity and temperature *** profile increases due to the increment in Prandtl number and Eckert *** comparison is also presented between the existing published results by takingα=0;m=0 as a special case of our study.

关键词： Heat and mass transfer Joule heating Ohms law Blood flow Ree–Eyring fluid

Comparative numerical study of single and two-phase models of nanofluid heat transfer in wavy channel

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Applied mathematics and mechanics(English Edition) 2014年第7期35卷 831-848页

作者： m.m.rashidi A.HOSSEINI I.POP S.KUmAR N.FREIDOONImEHR Department of mechanical Engineering Faculty of EngineeringBu-Ali Sina UniversityHamedan 65178-38695 Iran Department of mathematics Babe?Bolyai UniversityCluj-Napoca 400084Romania Department of mathematics National Institute of TechnologyJamshedpur 831014Jharkhand India Young Researchers & Elite Club Hamedan BranchIslamic Azad UniversityHamedan 65181-15743 Iran

The main purpose of this study is to survey numerically comparison of two- phase and single phase of heat transfer and flow field of copper-water nanofluid in a wavy channel. The computational fluid dynamics （CFD） prediction is used for heat transfer and flow prediction of the single phase and three different two-phase models （mixture, volume of fluid （VOF）, and Eulerian）. The heat transfer coefficient, temperature, and velocity distributions are investigated. The results show that the differences between the temperature fie].d in the single phase and two-phase models are greater than those in the hydrodynamic tleld. Also, it is found that the heat transfer coefficient predicted by the single phase model is enhanced by increasing the volume fraction of nanoparticles for all Reynolds numbers; while for the two-phase models, when the Reynolds number is low, increasing the volume fraction of nanoparticles will enhance the heat transfer coefficient in the front and the middle of the wavy channel, but gradually decrease along the wavy channel.

关键词： nanofluid two-phase model wavy channel semi implicit method for pres-sure linked equation (SImPLE) method

Optimization of operating conditions in the steam turbine blade cascade using the black-box method

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Propulsion and Power Research 2023年第4期12卷 467-485页

作者： Vahid Sadrian Esmail Lakzian Davood Hoseinzade Behrad Haghighi m.m.rashidi Heuy Dong Kim Center of Computational Energy Department of Mechanical EngineeringHakim Sabzevari UniversitySabzevarIran Department of mechanical Engineering Andong National UniversityAndongSouth Korea Department of mechanical Engineering Vali-e-Asr University of RafsanjanRafsanjanIran Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Faculty of Science University of JohannesburgPO Box 524Auckland Park 2006South Africa

Water droplets cause corrosion and erosion,condensation loss,and thermal efficiency reduction in low-pressure steam *** this study,multi-objective optimization was carried out using the black-box method through the automatic linking of a genetic algorithm(GA)and a computational fluid dynamics(CFD)code to find the optimal values of two design variables(inlet stagnation temperature and cascade pressure ratio)to reduce wetness in the last stages of *** wet steam flow numerical model was used to calculate the optimization parameters,including wetness fraction rate,mean droplet radius,erosion rate,condensation loss rate,kinetic energy rate,and mass flow *** the validation results showed a good agreement between the experimental data and the numerical *** to the optimization results,the inlet stagnation temperature and the cascade pressure ratio were proposed to be 388.67(K)and 0.55(-),*** particular,the suggested optimaltemperature and pressure ratio improved the liquid mass fraction and mean droplet radius by about 32%and 29%,***,in the identified optimal operating state,the ratios of erosion,condensation loss,and kinetic energy fell by 76%,32.7%,and 15.85%,respectively,while the mass flow rate ratio rose by 0.68%.

关键词： Black-box optimization Wet steam flow Steam turbine cascade Erosion rate Condensation loss

A numerical study for off-centered stagnation flow towards a rotating disc

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Propulsion and Power Research 2015年第3期4卷 169-178页

作者： m.Heydari G.B.Loghmani m.m.rashidi S.m.Hosseini Department of mathematics Yazd UniversityP.O.Box 89195-741YazdIran mechanical Engineering Department Engineering Faculty of Bu-Ali Sina UniversityHamedanIran Department of mathematics Khatam CenterIslamic Azad UniversityYazdIran

In this investigation,a semi-numerical method based on Bernstein polynomials for solving off-centered stagnation flow towards a rotating disc is *** method expands the desired solutions in terms of a set of Bernstein polynomials over a closed interval and then makes use of the tau method to determine the expansion coefficients to construct approximate *** method can satisfy boundary conditions at *** properties of Bernstein polynomials are presented and are utilized to reduce the solution of governing nonlinear equations and their associated boundary conditions to the solution of algebraic *** results are presented to investigate the influence of the rotation ratioαon the radial velocity,azimuthal velocity and the induced velocities.A comparative study with the previous results of viscous fluid flow in the literature is made.

关键词： Off-centered stagnation flow Similarity transform Bernstein polynomials Function approximation Tau method

Solution of analytical model for fuel spray penetration via homotopy perturbation method

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Propulsion and Power Research 2016年第3期5卷 202-210页

作者： B.Jalilpour S.Jafarmadar D.D.Ganji m.m.rashidi Department of mechanical Engineering Faculty of EngineeringUrmia UniversityUrmiaWest Azerbaijan 57561-15311Iran Babol University of Technology Department of Mechanical EngineeringP.O.Box 484BabolIran Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal management Systems Tongji UniversityShanghai 201804China ENN-Tongji Clean Energy Institute of Advanced Studies ShanghaiChina

The present paper attempts to solve equations in the initial stage and the two-phase flow regime of fuel spray penetration using the HPm-Padétechnique,which is a combination of the homotopy perturbation method(HPm)and Padé*** the initial stage,the effects of the droplet drag and the air entrainment were explained while in the two-phase flow stage,the spray droplets had the same velocities as the entrained *** results for various injection pressures and ambient densities are presented graphically and then discussed *** obtained results for these two stages show a good agreement with previously obtained expressions via successive approximations in the available *** numerical result indicates that the proposed method is straight forward to implement,efficient and accurate for solving nonlinear equations of fuel spray.

关键词： Spray Air entrainment Initial stage Two-phase flow Homotopy perturbation method(HPm)

Neurogenesis dynamics in the olfactory bulb:deciphering circuitry organization, function, and adaptive plasticity

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Neural Regeneration Research 2025年第6期20卷 1565-1581页

作者： moawiah m.Naffaa Department of Psychology and Neuroscience Duke UniversityDurhamNCUSA Department of Cell Biology Duke University School of MedicineDurhamNCUSA

Adult neurogenesis persists after birth in the subventricular zone, with new neurons migrating to the granule cell layer and glomerular layers of the olfactory bulb, where they integrate into existing circuitry as inhibitory interneurons. The generation of these new neurons in the olfactory bulb supports both structural and functional plasticity, aiding in circuit remodeling triggered by memory and learning processes. However, the presence of these neurons, coupled with the cellular diversity within the olfactory bulb, presents an ongoing challenge in understanding its network organization and function. moreover,the continuous integration of new neurons in the olfactory bulb plays a pivotal role in regulating olfactory information processing. This adaptive process responds to changes in epithelial composition and contributes to the formation of olfactory memories by modulating cellular connectivity within the olfactory bulb and interacting intricately with higher-order brain regions. The role of adult neurogenesis in olfactory bulb functions remains a topic of debate. Nevertheless, the functionality of the olfactory bulb is intricately linked to the organization of granule cells around mitral and tufted cells. This organizational pattern significantly impacts output, network behavior, and synaptic plasticity, which are crucial for olfactory perception and memory. Additionally, this organization is further shaped by axon terminals originating from cortical and subcortical regions. Despite the crucial role of olfactory bulb in brain functions and behaviors related to olfaction, these complex and highly interconnected processes have not been comprehensively studied as a whole. Therefore, this manuscript aims to discuss our current understanding and explore how neural plasticity and olfactory neurogenesis contribute to enhancing the adaptability of the olfactory system. These mechanisms are thought to support olfactory learning and memory, potentially through increased

关键词： network adaptability neurogenesis neuronal communication olfactory bulb olfactory learning olfactory memory synaptic plasticity