ABSTRACT
In this appendix, we present a heuristic approach with which to obtain the following formula: Z
v n d = Z
r (v) dV: (A.1)
The interested reader may also consult a formal proof in [185].
Now, let us consider a uniform steady uid velocity eld vi, through a rectilinear horizontal channel with rectangular cross-section, originating a volume ux V and a mass ux M , crossing a planar surface S with area A(S). (See Figure A.1.)
Figure A.1: Uniform liquid mass ow.
