4. Entropy generation
All thermal systems confront with entropy generation. Entropy
generation is squarely associated with thermodynamic irreversibility.
It is imperative to determine the rate of entropy
generation in a system, in order to optimize energy for efficient
operation in the system. The convection process in a channel is
inherently irreversible and this causes continuous entropy generation.
Woods [41] gave the local volumetric rate of entropy
generation for a viscous incompressible conducting fluid in
the presence of magnetic field as follows: