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Convection of Radiating Gas in a Vertical Channel through Porous Media

World Journal of Mechanics 2011年第6期1卷 275-282页

作者： Mrinal jana Sovan Lal Maji Sanatan Das rabindranath jana 不详

The free convection flow of radiating gas between two vertical thermally conducting walls through porous medium in the presence of a uniform gravitational field has been studied. Closed form solutions for the velocity and temperature have been obtained in the optically thin limit case when the wall temperatures are varying linearly with the vertical distance. It is observed that the fluid velocity increases and the temperature difference between the walls and the fluid decreases with an increase in the radiation parameter. It is also observed that both the fluid velocity and temperature in the flow field increase with an increase in the porosity parameter. It is found that the fluid velocity decreases while the temperature increases with an increase in the thermal conductance of the walls. Further, it is found that radiation causes to decrease the rate of heat transfer to the fluid, thereby reducing the effect of natural convection.

关键词： Radiation Porous Medium Heat Transfer and Thermal Conductance

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Effects of Hall Current and Ion-Slip on Unsteady MHD Couette Flow

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Open Journal of Fluid Dynamics 2012年第1期2卷 1-13页

作者： Nirmal Ghara Sovan Lal Maji Sanatan Das rabindranath jana Swapan Kumar Ghosh Department of Applied Mathematics Vidyasagar University Midnapore India Department of Mathematics Narajole Raj College Narajole India

The unsteady MHD Couette flow of an incompressible viscous electrically conducting fluid between two infinite non- conducting horizontal porous plates under the boundary layer approximations has been studied with the consideration of both Hall currents and ion-slip. An analytical solution of the governing equations describing the flow is obtained by the Laplace transform method. It is seen that the primary velocity decreases while the magnitude of secondary velocity increases with increase in Hall parameter. It is also seen that both the primary velocity and the magnitude of secondary velocity decrease with increase in ion-slip parameter. It is observed that a thin boundary layer is formed near the stationary plate for large values of squared Hartmann number and Reynolds number. The thickness of this boundary layer increases with increase in either Hall parameter or ion-slip parameter.

关键词： MHD Couette Flow Porous Plate Hall Current Ion-Slip Hartmann Number and Reynolds Number

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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

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Convection of Radiating Gas in a Vertical Channel through Porous Media

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World Journal of Mechanics（力学国际期刊） 2011年第6期

作者： Mrinal jana Sovan Lal Maji Sanatan Das rabindranath jana

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Effects of Hall Current and Ion-Slip on Unsteady MHD Couette Flow

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Open Journal of Fluid Dynamics（流体动力学） 2012年第1期

作者： Nirmal Ghara Sovan Lal Maji Sanatan Das rabindranath jana Swapan Kumar Ghosh

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

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World Journal of Mechanics（力学国际期刊） 2011年第2期

作者： rabindranath jana1 Mrinal Maji1 Sanatan Das1 Sovan Lal Maji1 Swapan Kumar Ghosh2

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