Give that
Nu = Nusselt number,
Re = Reynolds number,
Pr = Prandtl number,
Sh = Sherwood number,
Sc = Schmidt number, and
Gr = Grashoff number, the functional relationship for free convective mass transfer is given as :
(a) Nu = f (Gr, Pr)
(b) Sh = f (Sc, Gr)
(c) Nu = f (Re, Pr)
(d) Sh = f (Re, Sc).