A very thin layer of fluid, in the immediate vicinity of a solid boundary surface, where the velocity of the flowing fluid increases gradually from zero at the boundary surface to the velocity of the main stream is known as boundary layer.
It is to be noted that the higher the Reynolds number (or smaller the viscosity), the thinner is the boundary layer. Within the boundary layer, the flow can either be laminar or turbulent. The concept of boundary layer helps in significantly simplifying the theoretical treatment of flows with high Reynolds number.
It is to be noted that the higher the Reynolds number (or smaller the viscosity), the thinner is the boundary layer. Within the boundary layer, the flow can either be laminar or turbulent. The concept of boundary layer helps in significantly simplifying the theoretical treatment of flows with high Reynolds number.
nice information....
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ReplyDeleteTurbulent jet flows are also part of a boundary-layer theory: http://thermofluidsstudentarticles.files.wordpress.com/2014/02/temperature-field-of-nonisothermal-turbulent-jet1.pdf
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