Unsteady laminar mixed convection about a spinning sphere with a magnetic field

Öztürk, Ayşegül

doi:10.1007/s00231-004-0584-7

Cited by 14 publications

(3 citation statements)

References 19 publications

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“…Laminar forced convection heat transfer around and inside a spherical fluid droplet has been discussed by Antar et al [18]. Ozturk [19] discussed the unsteady boundary-layer flow over impulsively started translating and spinning isothermal body of revolution in the presence of buoyancy force and the applied magnetic field. The study of the flow and heat transfer characteristics in unsteady boundary-layer growth over a rotating sphere in forced flow caused by a uniformly accelerated freestream velocity is concluded by Hatzikonstantinou [20].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Radiative Natural Convection Flow Around a Magnetized Sphere

Ashraf

Ahmad

Hossain

2015

Journal of Thermophysics and Heat Transfer

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The natural convection flow from a magnetized sphere in the presence of thermal radiation is considered. The characteristics of boundary-layer flow in the form of skin friction, rate of heat transfer, and current density at different positions of the sphere are evaluated. The numerical solutions of velocity profile, temperature distribution, and transverse component of the magnetic field are also presented. In the present study, the finite-difference method is used to find the numerical solutions of the flow model.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Radiative Natural Convection Flow Around a Magnetized Sphere

Ashraf

Ahmad

Hossain

2015

Journal of Thermophysics and Heat Transfer

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“…Some of the researchers have studied and analyzed this geometry, such as Ozturk and Ece(1995, 1999), Bayram and Ece(2002), Beg et al (2016) and Ozturk (2005). Ozturk (2005) has investigated the laminar mixed convection flow on a rotation spherical body. He also considered the effect of the magnetic field to demonstrate that the heat transfer on upstream face increases with the magnetic field.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, there is a tangential flow in this problem. Some of the researchers have studied and analyzed this geometry, such as Ozturk and Ece(1995, 1999), Bayram and Ece(2002), Beg et al (2016) and Ozturk (2005). Ozturk (2005) has investigated the laminar mixed convection flow on a rotation spherical body.…”

Section: Introductionmentioning

confidence: 99%

Entropy generation analysis for convective flow of aqua Ag-CuO hybrid nanofluid adjacent to a warmed down-pointing rotating vertical cone

Berrehal,

Karami,

Dinarvand

et al. 2023

HFF

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Purpose This paper aims to study numerically the flow, heat transfer, and entropy generation of aqueous copper oxide-silver hybrid nanofluid over a down-pointing rotating vertical cone, with linear surface temperature (LST) and linear surface heat flux (LSHF), in the presence of a cross-magnetic field. In industrial applications, such as oil and gas plants, food industries, steel factories and nuclear packages, the real bodies may contain nonorthogonal walls and variable cross-section three-dimensional forms which this issue can clarify the importance of selective geometry in the present research. Design/methodology/approach The mass-based scheme is accomplished for the simulation, and the entropy generation and Bejan number will be analyzed in conjunction with the aforementioned model. It has been hypothesized that two types of boundary conditions (LST and LSHF) as well as five nanoparticle shapes (sphere, brick, cylinder, platelet and disk) present a collection of crucial results. The overseeing PDEs are changed over completely to the dimensionless ODEs, and these are solved by Runge–Kutta–Fehlberg approach combined with a shooting methodology for certain values of physical parameters. Findings Subsequent to the fantastic compromise of the computational outcomes with past reports, the outcomes are introduced to conduct the investigation of the hydrodynamics/thermal boundary layers, the skin friction and the Nusselt number, as well as entropy generation and Bejan number. A state of hybrid nanofluid, which exhibits a remarkable increase in heat transfer in comparison to the states of mono-nanofluid and regular fluid, has been found to have the highest Nusselt number; however, the skin friction values should always be taken into account and managed. The entropy generation improves with the mass of the second nanoparticle (silver), while the opposite pattern is exhibited for the Bejan number. Furthermore, the lowest value of entropy generation number belongs to the cylindrical shape of nanoparticles in the LST case. In final, a significant accomplishment of the current study is the accurate output of the mass-based scheme for an entropy analysis problem. Originality/value To the best of the authors’ knowledge, for the first time, in this study, a new development of natural convective flow of a hybrid nanofluid about the warmed (LST and LSHF) and down-pointing rotating vertical cone by the mass-based algorithm has been presented. The applied methodology considers the masses of base fluid (water) and nanoparticles (Ag and CuO) as an alternative to the first and second nanoparticles volume fraction. Indeed, the combination use of the Tiwari–Das nanofluid model and the mass-based hybridity algorithm for the entropy generation analysis can be the main novelty of this work.

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The laminar free‐convection boundary‐layer flow about a heated and rotating down‐pointing vertical cone in the presence of a transverse magnetic field

Dinarvand

2010

Numerical Methods in Fluids

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SUMMARYThis paper deals with the study of the laminar free-convection boundary-layer flow about a heated and rotating down-pointing vertical cone in the presence of a transverse magnetic field. Two cases of heat transfer analysis are discussed. These are: (i) the rotating cone with prescribed surface temperature and (ii) the rotating cone with prescribed surface heat flux. By means of similarity transformation, the governing partial differential equations are reduced into highly non-linear ordinary differential equations. The resulting non-linear system has been solved analytically using a very efficient technique, namely homotopy analysis method. Expressions for velocity and temperature fields are developed in a series form. The influence of various pertinent parameters is also seen on the velocity and temperature fields.

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Unsteady laminar mixed convection about a spinning sphere with a magnetic field

Cited by 14 publications

References 19 publications

Numerical Simulation of Radiative Natural Convection Flow Around a Magnetized Sphere

Numerical Simulation of Radiative Natural Convection Flow Around a Magnetized Sphere

Entropy generation analysis for convective flow of aqua Ag-CuO hybrid nanofluid adjacent to a warmed down-pointing rotating vertical cone

The laminar free‐convection boundary‐layer flow about a heated and rotating down‐pointing vertical cone in the presence of a transverse magnetic field

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