M2. The effect of magnetic parameter M2 on the entropy generation
number is displayed in Fig. 9. This figure shows that
the entropy generation is slightly increases with magnetic
parameter M2. The magnetic parameter M2 is not too much
dominating on entropy generation. A large variation of M2
causes a small variation in the rate of entropy generation.
Fig. 10 show that the entropy generation number NS increases
near the plate g =0 and it decreases near the plate g= 1 with
an increase in Reynolds number Re. It is revealed from Fig. 11
that the entropy generation number NS increases in the region
0 6 g 6 0.7 and it decreases in the region 0.7< g 6 1 with an
increase in Brinkmann number Br. This is physically true since
Br is the coefficient of the viscous and Joule dissipations in the
energy equation (see Eq. (6)) and its increase raises the fluid
temperature via the increase in viscous and Joule dissipations.
As the fluid temperature increases, temperature gradient