The porosity, permeability and restructuring of heterogeneous filter cakes
journal contribution
posted on 2010-09-09, 08:35authored byKuhan Chellappah, Steve Tarleton, Richard J. Wakeman
The constant pressure filtration characteristics of cellulose fibers, titania (rutile) and mixtures of the two were studied using an automated filtration apparatus. With filtrations at 450 kPa, the average permeability (kav) for pure fiber and rutile were approximately 3.2 × 10–17 and 1.3 × 10–16 m2, respectively, with the variation of kav with fiber fraction showing a maximum. Similar trends were observed at filtration pressures of 150 and 600 kPa. The porosities (ϵav) of filter cakes formed from pure fiber and rutile suspensions were approximately 0.75 and 0.6, respectively. Interparticle penetration and additive porosity models were applied to the porosity data, and the additive porosity model appeared to better represent the experimental data. Also, the results obtained suggest that abrupt transitions in cake structure occur part way through some filtrations, resulting in anomalous filtration behavior.
History
School
Aeronautical, Automotive, Chemical and Materials Engineering
Department
Chemical Engineering
Citation
CHELLAPPAH, K., TARLETON, E.S. and WAKEMAN, R.J., 2010. The porosity, permameability and restructuring of heterogeneous filter cakes. Chemical Engineering and Technology, 33 (8), pp.1283-1289.