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World Journal of Mechanics 2018年第9期8卷 362-377页

作者： swapan kumar ghosh Department of Mathematics Narajole Raj College Narajole West Bengal India

The present investigation reveals to a magnetohydrodynamic (MHD) start up flow of a rotating environment permeated by a traveling magnetic field with reference to a periodic driving force to explore the behaviour of a magnetic field at the resonant level. In a time varying electromagnetic field of sinusoidal in nature subject to ∇⋅J≠0, an oscillating current flow emerges the backbone of a radio emission in which the emission of hot electron gyrates in a magnetic field in the presence of a radiofrequency accelerator. The expedition of a radiofrequency field determines X-emission to expedite radiofrequency voltage under the influence of A.C circuit subject to ∇⋅J≠0. An oscillating current flow deals with an excitation frequency in such a way that phase angle rotates with angular frequency, the magnetic field grows towards the resonant level when the phase angle ωτ=π/2 is compatible with ω>0. In turn, plasma induced laser radiation is influenced by an oscillator with a decisive importance to an excitation frequency in the presence of a magnetic mirror so that maximum reflection occurs as the magnetic field increase in strength abruptly to exhibit resonance fluorescence. A synchronized laser photon light in transmitted from the Sun subject to ωτ=π/2.

关键词： MHD Start Up Flow Forced Oscillation Stagnation Radio Emission X-Emission Resonance Fluorescence Laser Radiation

Dynamo Mechanism of the Sun with Reference to Magnetohydrodynamic Flows

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World Journal of Mechanics 2014年第4期4卷 112-115页

作者： swapan kumar ghosh Department of Mathematics Narajole Raj College Narajole India

Resonance exhibits a dynamo mechanism of the Sun with an exotic behavior of a controlled thermonuclear fusion reaction in the presence of a magnetic mirror. A charged oscillator takes place of a periodic driving force so that the laser radiation is so intense with the growing of a magnetic field towards the resonant level. Following the representation of a new era of a magnetic field, it has many practical applications of magnetohydrodynamics. In response to the practical situation of interest, a mechanism has been developed with reference to a dynamo mechanism of the system.

关键词： MHD Flow Radio Emission X-Emission Laser Radiation Displacement Current Dynamo Mechanism Resonance

Conspiracy Determines World War III with Reference to Several Windows’ Channel in Connection with Earth Observation Satellite

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World Journal of Mechanics 2018年第4期8卷 107-111页

作者： swapan kumar ghosh Department of Mathematics Narajole Raj College Midnapore India

Thermonuclear reaction exerts its influence of X-emission to produce several windows’ channel in the presence of an oscillator under electrical relay circuit with a decisive importance to a radiofrequency Earth observation satellite. Indian Television Network (National Channel) has introduced a radiofrequency accelerator to produce X-emission at resonance with an activation of artificial human environment under relay analogy in the presence of an Earth observation satellite. Thermonuclear reaction communicates several windows’ channel via Earth observation satellite. Star Television network communicates an artificial human environment under the influence of a relay circuit with different pulse code units of human brain with an active influence of an artificial sensation to generate the loss of humanity around the world.

关键词： Thermonuclear Reaction Radio Emission X-Emission Earth Observation Satellite Window Channel

A Time Decay Vacuum is a New Era of Space Science with Reference to Magnetohydrodynamic Flows

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World Journal of Mechanics 2011年第3期1卷 83-86页

作者： swapan kumar ghosh 不详

A controlled thermonuclear fusion reaction of the Sun is the heart of the space craft propulsion system. A band of ultraviolet radiation and X-ray emission of shorter wave length permeated by a magnetic mirror in the presence of a radiofrequency accelerator with the Sun at the resonant level is to produce hydrogen fusion laser due to a driving force to act as a laser fusion thruster. A superfluid helium (4He2) of burning with the Sun is a fifth state of matter. A higher state of matter is confined to a typical helical line which corresponds to the existence of outer universe.

关键词： Radiofrequency Accelerator Magnetic Mirror Charged Oscillator Microwave Background of Radiation Fifth State of Matter

Radiative Heat Transfer of an Optically Thick Gray Gas in The Presence of Indirect Natural Convection

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World Journal of Mechanics 2011年第2期1卷 64-69页

作者： Rabindra Nath Jana swapan kumar ghosh 不详

We study the effects of thermal radiation of a viscous incompressible fluid occupying a semi-infinite region of space bounded by an infinite horizontal moving hot flat plate in the presence of indirect natural convection by way of an induced pressure gradient. The fluid is a gray, absorbing emitting radiation but a non scattering medium. An exact solution is obtained by employing Laplace transform technique. Since temperature field depends on Reynold number the flow is considered to be non-isothermal case (the temperature of the plate Tw ≠ constant) and for an isothermal case (Tw = constant) the flow is determined by the Reynold number which is equal to 1.

关键词： Thermal Radiation Indirect Natural Convection Reynold Number Stefan-Boltzman Radiation Parameter

A Mathematical Model for Magnetohydrodynamic Convection Flow in a Rotating Horizontal Channel with Inclined Magnetic Field, Magnetic Induction and Hall Current Effects

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World Journal of Mechanics 2011年第3期1卷 137-154页

作者： swapan kumar ghosh Osman Anwar Bég Abdul Aziz 不详

Closed-form and asymptotic solutions are derived for the steady, fully-developed hydromagnetic free and forced convection flow in a rotating horizontal parallel-plate channel under the action of an inclined magnetic field and constant pressure gradient along the longitudinal axis of the channel. The magnetic field is strong enough to generate Hall current effects and the magnetic Reynolds number of sufficient magnitude that induced magnetic field effects are also present. Secondary flow is present owing to the Hall current effect. The channel plates are also taken to be electrically-conducting. The conservation equations are formulated in an (x, y, z) coordinate system and non-dimensionalized using appropriate transformations. The resulting non-dimensional coupled ordinary differential equations for primary and secondary velocity components and primary and secondary induced magnetic field components and transformed boundary conditions are shown to be controlled by the dimensionless pressure gradient parameter (px), Hartmann number (M2), Grashof number (G), Hall current parameter (m), rotational parameter (K2), magnetic field inclination (Θ), and the electrical conductance ratios of the upper (⏱) and lower (⏲) plates. Solutions are derived using the method of complex variables. Asymptotic solutions are also presented for very high rotation parameter and Hartmann number of order equal to unity, for which Ekman-Hartmann boundary layers are identified at the plates. A parametric study of the evolution of velocity and induced magnetic field distributions is undertaken. It is shown that generally increasing Hall current effect (m) serves to accentuate the secondary (cross) flow but oppose the primary flow. An increase in rotational parameter (K2) is also found to counteract primary flow intensity. An elevation in the Grashof number i.e. free convection parameter (G) is shown to aid the secondary induced magnetic field component (Hz);however there is a decrea

关键词： Hydromagnetic Flow Hall Current Electrical Conductance Free And Forced Convection Critical Grashof Number Rotation Complex Variables Asymptotic Analysis Ekman-Hartmann Boundary Layers Astronautics

Mathematical Modelling of Mass Transfer and Free Convection Current Effects on Unsteady Viscous Flow with Ramped Wall Temperature

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World Journal of Mechanics 2011年第4期1卷 176-184页

作者： Marneni Narahari Osman Anwar Bég swapan kumar ghosh 不详

An exact analysis of the flow of an incompressible viscous fluid past an infinite vertical plate is conducted taking into account the presence of foreign mass or constant mass flux and ramped wall temperature. The dimensionless governing coupled linear partial differential equations are solved using the Laplace transform technique. Two different solutions for the fluid velocity are obtained–one valid for the fluids of Schmidt numbers different from unity, and the other for which the Schmidt number is unity. The effects of Prandtl number (Pr), Schmidt number (Sc), time (t) and mass to thermal buoyancy ratio parameter (N) for both aiding and opposing buoyancy effects on the velocity and skin-friction are studied. Also, the heat and mass transfer effects on the flow near a ramped temperature plate have been compared with the flow near a plate with constant temperature.

关键词： Natural Convection Vertical Plate Ramped Wall Temperature Heat and Mass Transfer

Numerical Modelling of Non-similar Mixed Convection Heat and Species Transfer along an Inclined Solar Energy Collector Surface with Cross Diffusion Effects

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World Journal of Mechanics 2011年第4期1卷 185-196页

作者： Osman Anwar Bég Ahmed Bakier Ramachandra Prasad swapan kumar ghosh 不详

An analysis is performed to study thermo-diffusion and diffusion-thermo effects on mixed convection heat and mass transfer boundary layer flow along an inclined (solar collector) plate. The resulting governing equations are transformed and then solved numerically using the local nonsimilarity method and Runge-Kutta shooting quadrature. A parametric study illustrating the influence of thermal buoyancy parameter (ζ), Prandtl number (Pr), Schmidt number (Sc), Soret number (Sr), Dufour number (Du) and concentration-to- thermal-buoyancy ratio parameter, N, on the fluid velocity, temperature and concentration profiles as well as on local skin-friction, Nusselt and Sherwood numbers is conducted. For positive inclination angle of the plate (γ = 70 degrees), flow velocity (f') is strongly increased i.e. accelerated, with thermal buoyancy force parameter (ζ), in particular closer to the plate surface;further into the boundary layer, ζ has a much reduced effect. Conversely temperature (θ) and concentration (ψ) is decreased with increasing thermal buoyancy parameter, ζ. For negative plate inclination, the flow is accelerated whereas for positive inclination it is decelerated i.e. velocity is reduced. Conversely with negative plate inclination both the temperature and concentration in the boundary layer is reduced with the opposite apparent for positive inclination. Increasing Prandtl number strongly reduces temperature in the regime whereas an increase in Schmidt number boosts temperatures with temperature overshoots near the plate surface for Sc = 3 and 5 (i.e. for Sc > 1). Concentration is reduced continuously throughout the boundary layer, however, with increasing Schmidt number. A positive increase in concentration-to-thermal-buoyancy ratio parameter, N, significantly accelerates the flow in the domain, whereas negative N causes a deceleration. A velocity overshoot is also identified for N = 20, at intermediate distance from the plate surface. Ne

关键词： Heat and Mass Transfer Inclined Plate Soret/Dufour Effects Buoyancy Numerical Solar Energy

Hydrodynamic Flow between Two Non-Coincident Rotating Disks Embedded in Porous Media

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World Journal of Mechanics 2011年第2期1卷 50-56页

作者： Rabindranath Jana Mrinal Maji Sanatan Das Sovan Lal Maji swapan kumar ghosh 不详

Hydrodynamic viscous incompressible fluid flow through a porous medium between two disks rotating with same angular velocity about two non-coincident axes has been studied. An exact solution of the govern-ing equations has been obtained in a closed form. It is found that the primary velocity decreases and the sec-ondary velocity increases with increase in porosity parameter to the left of the z-axis and the result is re-versed to the right of the z-axis. It is also found that the torque on the disks increases with increase in either rotation parameter or porosity parameter. For large rotation, there exist a thin boundary layer near the disks and the thickness of this boundary layer decreases with increase in porosity parameter.

关键词： Hydrodynamic Non-Coincident Disks Porous Medium Boundary Layer Thickness Rotation Parameter

Modified Differential Transform Method (DTM) Simulation of Hydromagnetic Multi-Physical Flow Phenomena from a Rotating Disk

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World Journal of Mechanics 2011年第5期1卷 217-230页

作者： Mohammad Mehdi Rashidi Esmael Erfani Osman Anwar Bég swapan kumar ghosh 不详

A similarity solution for the steady hydromagnetic convective heat and mass transfer with slip flow from a spinning disk with viscous dissipation and Ohmic heating yields a system of non-linear, coupled, ordinary differential equations. These equations are analytically solved by applying a newly developed method namely the DTM-Padé technique which is a combination of the Differential Transform Method (DTM) and the Padé approximation. A full analytical solution is presented, as a benchmark for alternative numerical solutions. DTM-Padé is implemented without requiring linearization, discretization, or perturbation, and holds significant potential for solving strongly nonlinear differential equations which arise frequently in fluid dynamics. The regime studied is shown to be controlled by the slip parameter (γ), magnetohydrodynamic body force parameter (M), Eckert (viscous heating) number (Ec), Schmidt number (Sc), Soret number (Sr), Dufour number (Du) and Prandtl number (Pr). The influence of selected parameters on the evolution of dimensionless velocity, temperature and concentration distributions is studied graphically. Increasing magnetic field (M) is found to significantly inhibit the radial (f) and tangential (g) velocities, but to accentuate the axial velocity field (h);furthermore temperature (θ) and concentration (φ) are both enhanced with increasing M. Increasing Soret number (Sr) acts to boost the dimensionless concentration (φ). Temperatures are significantly elevated in the boundary layer regime with a rise in Eckert number (Ec). Excellent correlation between the DTM-Padé technique and numerical (shooting) solutions is achieved. The model has important applications in industrial energy systems, process mechanical engineering, electromagnetic materials processing and electro-conductive chemical transport processes.

关键词： Differential Transform Method Padé Approximants Thermal-Diffusion Heat Transfer Soret Effect Boundary-Layers Hydromagnetics Slip Dissipation Electromagnetic Processing of Materials