Abstract:
In this study, the entropy generation for steady, compressible gas
flow inside two-dimensional rectangular microchannel at slip flow regime
with constant walls temperature under the influence of magnetic field was
analytically investigated. The obtained velocity and temperature distributions
were used in this study. The influences of changing several parameters, such as,
Knudsen number, Brinkman number, Hartmann number, aspect ratio, electric
field to magnetic field ratio and pressure ratio were investigated. A finite
volume method was used for numerical validation. The obtained results showed
that the total entropy generation decreases in the direction toward the wall of
the microchannel and increases along the flow direction. The total entropy
generation increases as Knudsen number, aspect ratio, electric to magnetic field
ratio, pressure ratio and Brinkman number increases. Entropy generation due to
the magnetic field effect had the maximum value except the region near the
walls of the microchannel. Entropy generation due to the friction effect was
low along the centreline and increase toward the walls, while entropy
generation due to the heat transfer effect was very low as compared to the
friction effect and magnetic effect.