34 research outputs found
Study of flow past an exponentially accelerated isothermal vertical plate in the presence of chemical reaction
Theoretical study of unsteady flow past an exponentially accelerated infinite isothermal vertical plate with variable mass diffusion has been presented in the presence of homogeneous chemical reaction of first order. The plate temperature is raised to Tw and species concentration level near the plate is made to rise linearly with time. The dimensionless governing equations are solved using Laplace-transform technique. The velocity profiles are studied for different physical parameters like chemical reaction parameter, thermal Grashof number, mass Grashof number, a and time. It is observed that the velocity increases with increasing values of a or t. But the trend is just reversed with respect to K
Hydromagnetic Flow Past an Exponentially Accelerated Isothermal Vertical Plate with Uniform Mass Diffusion in the Presence of Chemical Reaction of first Order
An exact solution of an unsteady flow past an exponentially accelerated infinite isothermal vertical plate with uniform mass diffusion in the presence of a transverse magnetic field has been studied. The plate temperature is raised to Tw and the species concentration level near the plate is also made to rise Cʹw . The dimensionless governing equations are solved using the Laplace-transform technique. The velocity, temperature and concentration profiles are studied for different physical parameters such as the magnetic field parameter, chemical reaction parameter, thermal Grashof number, mass Grashof number, Schmidt number, time and a. It is observed that the velocity decreases with increasing the magnetic field parameter
Propagation of magnetoacoustic surface waves along static plasma slab surrounded by moving plasma and neutral gas
The existence and propagation of fast and slow
magnetoacoustic surface waves (MASW) is investigated in our work by taking a
theoretical model of a static plasma slab as the middle layer with a moving
plasma region at the top and neutral gas medium as the bottom layer.
Applying linear MHD, the dispersion relation is obtained and the propagation
of magnetoacoustic surface waves, in the compressional limit for steady flow
and for different values of dimensionless wave numbers, is analyzed. Steady
flow of plasma along a structured atmosphere may cause enhancement of
existing surface modes, disappearance of some modes and generation of new
surface wave modes. The possible regions for the propagation of fast and
slow surface and body waves for different mass density ratios and magnetic
field ratios and with a small flow velocity are studied. Our discussion may
help in analyzing more complicated cases