ABSTRACT
This chapter considers the kinetics of spreading over porous substrates. It investigates the kinetics of the spreading of small liquid drops over thin porous layers saturated with the same liquid. The chapter discusses the spreading of silicone oil drops over various dry microfiltration membranes. It also considers a spreading of “big” drops over a thin porous substrate but still the droplet size is small enough to neglect the gravity action. The spreading of liquids over solid surfaces is one of the fundamental processes with a number of applications such as coating, printing, and painting. Two charged couple device cameras and two tape recorders are used for storing of the sequences of spreading. Spreading of small drops of blood, which is a non-Newtonian liquid but completely wets the porous substrate, over a dry porous layer is investigated from both theoretical and experimental points of view.
