Pressure determination of the water baffle shift in the capillary

摘要

The ability of soils to pass water characterizes water permeability, which is an important characteristic, depending on the type of soil, porosity and pore size distribution. It is estimated using the filtration coefficient k. To have information on the value of water permeability is necessary when creating irrigation systems, reservoirs, canals, dams and many other cases. Water permeability allows calculating water losses from these structures. The use of such technique as the creation of multi-layer thin-layer shields is effective to prevent the loss of water during its filtration from irrigating canals. Dissimilar materials, which leak in case of single laying-down,'can dramatically decrease the loss of water being multiply used. The pore sizes in the soils vary greatly, which leads to the appearance of 'Jarman's chains' - alternating thin holes with thickenings. Water is trapped in the narrowest places of the capillary and is located in separate areas. Therefore, this kind of capillaries can be a gas-waterproof screen. The menisci layers formed at the contact, which exert considerable resistance to water filtration. Entrapped air bubbles are surrounded by water baffles. The article, according to the theory of the capillary potential (potential is considered as work on transferring a unit of mass of liquid from a capillary into a free liquid at the same temperature and at the same altitude level). The theory allow study the pressure that needs to be used to such a baffle to make it move.