Dear Derrik Ling,
In the review paper I referred you to I also mention packed columns.
see "Dynamics and control of distillation columns - A
tutorial introduction", Trans IChemE (UK), Vol. 75, Part A, Sept. 1997, 539-562
(Presented at Distillation and Absorbtion 97, Maastricht, Netherlands, 8-10 Sept. 1997).
Most people model packed columns using a stage model, i.e. similar to
a trayed column.
There IS holdup in a packed column although it is somwehat less than
a trayed column.
In summary, there are some differences between packed and trayed,
but not that significant.
Best regards,
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Sigurd Skogestad, Professor and Head of Department Phone: +47-7359-4154
Department of Chemical Engineering Home: +47-7393-6855
Norwegian Univ. of Science and Technology (NTNU) Fax: +47-7359-4080
N-7491 Trondheim email: sigurd.skogestad@chembio.ntnu.no
Norway www.chembio.ntnu.no/users/skoge
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