Essay On Fluid Permeability
Preliminaries All materials exhibit deformation under the action of forces. If the deformation in the material increases continually without limit under the action of shearing forces, however small, the material is called a ‘fluid’. Fluid mechanics is that branch of science which deals with the behavior of the fluids (liquids or gases) at rest as well as in motion. Thus, this branch of science deals with the static, kinematics and dynamic aspects of fluids. The study of fluids at rest is called fluid statics. The study of fluids in motion, where pressure forces are not considered, is called fluid kinematics and if the pressure forces is also considered for the fluids in motion, that branch of science is called fluid dynamics. One …show more content…
Due to application in solid mechanics, transpiration cooling food preservation,, cosmetic industry, blood flow and artificial dialysis, the problem of flow through porous boundaries has received a great deal of attention both in technological as well as in biophysical field when water flows through a passage which is subjected to atmospheric pressure only, the passage is called an open channel. Examples of open channels are rivers, canals, sewers etc. A close pipe partially filled with water may also be called an open channel, because in such a pipe, the pressure above the water surface is atmospheric, since in open channels the pressure at the free surface of water is the same anywhere in the length of the channel (this pressure being atmospheric) flow is not due to difference of pressure along the channel but is due to the difference in potential head caused by the downward slope of the bed of the channel. Natural channels are rivers, streams etc., natural channels do not generally have uniform cross-section or regular shape everywhere. Artificial channels are irrigation canals, drains, etc., cross- sections of artificial channels are uniform everywhere along its length. In case of uniform flow (i) the loss of heat due to friction is equal to the difference in elevation of
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