Making the same approximations as in the previous case for
,but
making no assumption about the relative size of Kf and the aspect
ratio, we find that DEM gives
(K^*-K_fK_m-K_f) (K_mK^*)^11+b = (1-)^11+b, which can be rewritten in the form
(1K_f-1K^*)
(K^*K_m)^b1+b =
(1K_f-1K_m)(1-)^11+b.
It is now easy to check that (DEMKr32) reduces to (DEMKr11)
when
and that (DEMKr32) reduces to (DEMKr21)
when
.