First, the mass-transfer PDE is substituted into the solute transport equation. Now the mass transfer PDE is an explicit forward difference equation for the immobile phase, which is coupled to the expression for the mobile phase. Transport conditions tested have been both radial and 1-D linear.
Mass transfer is assumed to be linear and first-order.
All tests have shown matches to several digits of accuracy. None of these tests have been published. The field delimiters are G10.0. The field delimiters in all cases are 4G15.0. Currently, this routine prints to a file called 'ch.out'.