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Optimal spacings for channels with Hagen-Poiseuille fluid-flow and mass transfer - the role of the Bejan number

This work is a continuation of the recent studies [1, 2], revealing that the
 unique form of the Bejan number is robust (unchangeable) and appears
 independently in all Hagen-Poiseuille fluid-flows with heat or mass transfer
 by convection. The other dimensionless groups, derived from the First law of
 thermodynamics (related to the convection heat or mass transfer), and named
 Bejan numbers are combinations of the unique Bejan number with Prandtl or
 Schmidt numbers, respectively, and ratios of geometrical parameters of the
 system. In this paper we continue developing this idea through presenting
 new examples of problems in the field of convection mass transfer in pure
 laminar duct flows.