Mixed convection nanofluid flows through a grooved channel with internal heat generating solid cylinders in the presence of an applied magnetic field

2017 ◽  
Vol 107 ◽  
pp. 133-145 ◽  
Author(s):  
Victor M. Job ◽  
Sreedhara Rao Gunakala
Keyword(s):  
Magnetic Field ◽  
Mixed Convection ◽  
Applied Magnetic Field ◽  
Internal Heat

scholarly journals MHD Mixed Convection Micropolar Fluid Flow through a Rectangular Duct

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Mekonnen Shiferaw Ayano ◽  
Stephen T. Sikwila ◽  
Stanford Shateyi
Keyword(s):  
Magnetic Field ◽  
Differential Equations ◽  
Mixed Convection ◽  
Applied Magnetic Field ◽  
Flow Reversal ◽  
Convection Flow ◽  
Temperature Profiles ◽  
Rectangular Duct ◽  
Micropolar Fluid Flow ◽  
Flow Through

Mixed convection flow through a rectangular duct with at least one of the sides of the walls of the rectangle being isothermal under the influence of transversely applied magnetic field has been analyzed numerically in this study. The governing differential equations of the problem have been transformed into a system of nondimensional differential equations and then solved numerically. The dimensionless velocity, microrotation components, and temperature profiles are displayed graphically showing the effects of various values of the parameters present in the problem. The results showed that the flow field is notably influenced by the considered parameters. It is found that increasing the aspect ratio increases flow reversal, commencement of the flow reversal is observed after some critical value, and the applied magnetic field increases the flow reversal in addition to flow retardation. The microrotation components flow in opposite direction; also it is found that one component of the microrotation will show no rotational effect around the center of the duct.

scholarly journals Mixed Convection Flow over a Vertical Cone with an Applied Magnetic Field

2012 ◽  
Vol 11 (3) ◽  
pp. 105-112
Author(s):  
K R Jayakumar ◽  
A h Srinivasa ◽  
A T Eswara
Keyword(s):  
Magnetic Field ◽  
Mixed Convection ◽  
Applied Magnetic Field ◽  
Convection Flow ◽  
Mixed Convection Flow ◽  
Transfer Coefficients ◽  
Vertical Cone ◽  
Heat Transfer Coefficients ◽  
Implicit Finite Difference Scheme ◽  
Implicit Finite Difference

An analysis is performed to investigate the mixed convection flow over a vertical cone with an applied magnetic field when the axis of the cone is in line with the flow. The results have been obtained for assisting and opposing flows. The partial differential equations governing the non-similar flow have been solved by an implicit finite difference scheme in combination with the quasilinearization technique. Numerical results are reported here to account the effects of magnetic field in presence of buoyancy parameter at different stream wise locations on skin friction and heat transfer coefficients.

Effect of the second outlet location and the applied magnetic field within a ventilated cubic cavity crossed by a nanofluid on mixed convection mode: best configurations

2019 ◽  
Vol 139 (3) ◽  
pp. 2243-2264 ◽  
Author(s):  
Seddik Kherroubi ◽  
Karim Ragui ◽  
Abdelghani Bensaci ◽  
Nabila Labsi ◽  
Abdelkader Boutra ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Mixed Convection ◽  
Applied Magnetic Field

Homotopy perturbation approach for Ohmic dissipation and mixed convection effects on non-Newtonian nanofluid flow between two co-axial tubes with peristalsis

2021 ◽  
pp. 1-11
Author(s):  
Nabil T. Eldabe ◽  
Mohamed Y. Abou-zeid ◽  
Adel Abosaliem ◽  
Ahmed Alana ◽  
Nada Hegazy
Keyword(s):  
Magnetic Field ◽  
Mixed Convection ◽  
Wave Length ◽  
Magnetic Field Effect ◽  
Internal Heat ◽  
Perturbation Approach ◽  
Fluid Temperature ◽  
Ohmic Dissipation ◽  
Homotopy Perturbation ◽  
Nanoparticles Concentration

In this study, the effects of radially varying magnetic field, internal heat generation and mixed convection with thermal radiation on peristaltic motion of a non-Newtonian fluid are investigated. The fluid used is third-grade model. The flow is through the gap between two co-axial vertical tubes under the effect of radially varying magnetic field. The outer tube is flexible with sinusoidal deformations. The problem is modulated mathematically by a system of partial differential equations which describes the equations of momentum, heat transfer and nanoparticles concentration which are simplified by using long wave length and low-Reynolds number assumptions. The closed solutions of fluid temperature and nanoparticle concentration are obtained, and the solution of velocity is obtained by using the homotopy perturbation method (HPM). The radially varying magnetic field effect on the axial velocity is discussed and it is shown that the increase of magnetic field parameter tends to reduce the fluid flow.

scholarly journals The Effect of Thermal Modulation on Double Diffusive Convection in the Presence of Applied Magnetic Field and Internal Heat Source

2021 ◽  
Vol 26 (1) ◽  
pp. 135-155
Author(s):  
S.H. Manjula ◽  
P. Suresh ◽  
M.G. Rao
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Phase Modulation ◽  
Lower Boundary ◽  
Internal Heat ◽  
Internal Heat Source ◽  
Finite Amplitude ◽  
Nonlinear Stability Analysis ◽  
Thermal Modulation ◽  
Double Diffusive

AbstractThe investigation of thermal modulation on double-diffusive stationary convection in the presence of an applied magnetic field and internal heating is carried out. A weakly nonlinear stability analysis has been performed using the finite-amplitude Ginzburg-Landau model. This finite amplitude of convection is obtained at the third order of the system. The study considers three different forms of temperature modulations. OPM-out of phase modulation, LBMO-lower boundary modulation, IPM-in phase modulation. The finite-amplitude is a function of amplitude δT, frequency ω and the phase difference θ. The effects of δT and ω on heat/mass transports have been analyzed and depicted graphically. The study shows that heat/mass transports can be controlled effectively by thermal modulation. Further, it is found that the internal Rayleigh number Ri enhances heat transfer and reduces the mass transfer in the system.

The Effect of Gravity Modulation on Double Diffusive Convection in the Presence of Applied Magnetic Field and Internal Heat Source

2020 ◽  
Vol 12 (6) ◽  
pp. 792-805
Author(s):  
Palle Kiran ◽  
S. H. Manjula ◽  
R. Roslan
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Internal Heat ◽  
Internal Heat Source ◽  
Finite Amplitude ◽  
Gravity Modulation ◽  
Nonlinear Stability Analysis ◽  
Ginzburg Landau ◽  
Weakly Nonlinear ◽  
Double Diffusive

We have investigated the study of double diffusive stationary convection in the presence of applied magnetic field and internal heating. A weakly nonlinear stability analysis has been performed using the finite amplitude Ginzburg-Landau model. This finite amplitude of convection is obtained at third order of the system. It is assumed that the buoyancy term has two parts, steady and oscillatory parts. The second part is varying sinusoidally with time and vibrates the system with finite amplitude δ1 and frequency ω. The effects of δ1 and on heat/mass transports have been analysed and depicted graphically. The studies are established that the heat/mass transports can be controlled effectively by gravity modulation. Further, it is found that internal Rayleigh number Ri is to enhance heat transfer and reduces the mass transfer in the system.

scholarly journals Effects of magnetic field inclination and internal heat sources on nanofluid heat transfer and entropy generation in a double lid driven L-shaped cavity

2019 ◽  
pp. 325-325 ◽  
Author(s):  
Ali Chamkha ◽  
Zeinab Abdelrahman ◽  
Mohamed Mansour ◽  
Taher Armaghani ◽  
Ahmed Rashad
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Heat Source ◽  
Mixed Convection ◽  
Entropy Generation ◽  
Volume Fraction ◽  
Particle Volume Fraction ◽  
Internal Heat ◽  
Performance Criteria ◽  
Particle Volume

Mixed convection has been one of the most interesting subjects of study in the area of heat transfer for many years. The entropy generation due to MHD mixed convection heat transfer in L-shaped enclosure being filled with Cu-water nanofluid and having an internal heating generation is explored in this investigation by the finite volume technique. Lid-motion is presented by both right and top parts of walls to induce forced convection and the cavity is under an inclined uniform magnetic field along the positive horizontal direction. The statistics concentrated specifically on the impacts of several key parameters like as the aspect ratio of the enclosure, Hartmann number, nano-particle volume fraction, and heat source length/location on the heat transfer inside the L-shaped enclosure. Outcomes have been manifested in terms of isotherm lines, streamlines, local and average Nusselt numbers. The obtained results show that addition of nanoparticles into pure fluid leads to increase of heat transfer. The maximum value of local Nusselt pertaining to the heat source occurs when L=0.1. Impacts of heat source size and location, internal heat generation absorption, angle of magnetic field on heat transfer and entropy generation are completely analyzed and discussed. The best configuration and values of important parameters are also presented using thermal performance criteria.

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