• ASHOK KUMAR SINGH

      Articles written in Pramana – Journal of Physics

    • Effect of point/line heat source and Hall current on free convective flow between two vertical walls

      NAVEEN DWIVEDI ASHOK KUMAR SINGH

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      The influence of a point heat source and Hall current on the laminar hydromagnetic free convective flow of an incompressible and electrically conducting viscous liquid between two vertical walls has been studied. A wavelet function is utilised to mathematically formulate the point or line heat source. The incidental equations on the flow have been processed subject to the Boussinesq approximation. A unified analytical solution of basic equations like thermal energy and momentum has been derived by employing Laplace transform technique. The impacts of the pertinent physical parameters, such as Hall parameter, magnetic field and point heat source, on the velocity field are explained graphically. The valuable result from the investigation is that an increase in the length of the point heat source leads to the enhancement of the velocity profiles. Moreover, it is noticeable that an enhancement of Hall current has a direct connection with the primary factor of the volumetric flow rate and skin friction.

    • Hydromagnetic free convection in a vertical channel with induced magnetic field: Open and short circuits

      NAVEEN DWIVEDI ASHOK KUMAR SINGH PALLATH CHANDRAN NIRMAL C SACHETI

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      This theoretical paper deals with a fully developed free convective flow of an incompressible viscous and electrically conducting fluid in an infinitely long rigid vertical channel in the presence of an externally applied magnetic field. By retaining the induced magnetic field, we have carried out a detailed analysis of the field equations and obtained a host of interesting results corresponding to both open-circuit and short-circuit arrangements. The governing PDEs, which under the chosen physical configuration get transformed to a set of ordinary differential equations together with appropriate boundary conditions, have further been subjected to non-dimensionalisation. Using the theory of simultaneous ordinary differential equations, the analytical solutions for velocity, temperature field and induced magnetic field were obtained. These solutions were used to obtain important quantities of engineering interest such as current density, wall skin friction and volumetric flux for both open and short circuits.The effect of Hartmann number on the velocity, induced magnetic field and induced current density were shown quite extensively. Furthermore, the results for the symmetric and asymmetric heating of the vertical walls of the channelfor open- and short-circuit arrangements were compared. It is found that for the open-circuit arrangement, the velocity, induced current density and induced magnetic field are higher than that for the short-circuit arrangement.

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