Coating by capillary transport through porous media

A coating device which works with the help of a porous medium is considered . The fluid of interest is a surfactant solution which passes a porous medi um before it is deposited on a solid substrate. A hydrostatic model Sor the process is proposed which assumes the validity of DARCY's law as well as a n approach for slot coaters developed by Higgins and Scriven (1980). Emphas is will also be placed on the experimental determination of the porous medi a permeability and porosity. Moreover the model is compared with experiment al results.