Spreading of Aqueous Surfactant Solutions over Porous Layers

1 SPREADING OF AQUEOUS SURFACTANT SOLUTIONS OVER POROUS LAYERS 

Appropriate scales were used with a plot of the dimensionless radii of the drop base, of the wetted area inside the porous substrate, and the dynamic contact angle on the dimensionless time. 

In Chapter 4 the spreading of liquid drops over thin porous layers saturated with the same hquid (Section 4.1) or dry (Section 4.1) was investigated in the case of complete wetting. Brinkman s equations were used for the description of the liquid flow inside the porous substrate. 

In this section we take up the same problem in the case where a drop spreads over a dry porous layer as in partial wetting. Spreading of a big drop (but still small enough to neglect the gravity action) of aqueous SDS solutions over thin porous layers (nitrocellulose membrane) is considered in the following text. 

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