Principle of Separation

The name of the method designates the principal mechanism governing the separation: hydrodynamic phenomena appearing in fluids flowing through porous media or in capillaries. The separation in HC is performed in a carrier liquid flowing either through the void volume of a packed column or inside an open capillary of small diameter. The separated particles are carried by the flow with a velocity higher than the average velocity of the carrier liquid due to the tendency of the particles to concentrate in a radial position where the streamline velocity is higher compared with the average velocity of the liquid. Such a radial position corresponds to an energy minimum of the particles migrating within the field of shear forces. The driving forces which cause the radial flux of the separated particles can be of very diverse character. Another phenomenon participating in the separation processes can be the steric exclusion of the particles from a part of the volume within which the carrier liquid can flow near the column packing surface or near the wall of an open capillary. The velocity of the carrier liquid decreases to zero toward these surfaces and only small separated particles which can approach the surface of the column packing or capillary wall can elute with slow velocity in the vicinity of these surfaces. This situation is demonstrated in Figure 11 for a model case of the HC carried out in an open capillary.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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