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Drainage and imbibition

Video: Visualization experiment, drainage and imbibition (1:40 min)
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The circular rubber pieces (1 mm thick with a diameter of 1-2 cm) are placed between two horizontal glass plates and dye-stained water is injected with a medical syringe (the needle is visible at the bottom of the picture). You are looking vertically down onto the upper glass plate.This setup simulates a soil solution in the pore space between the particles. By decreasing the pressure in the water phase pw , the meniscii are being curved more strongly. Adding water, on the other hand, may lead to trapped air.

Here, it could almost completely escape because the particles are all almost of the same size.

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