Determination of Plug Flow
For flows in pipes, if flow is turbulent then the laminar sublayer caused by the pipe wall is so thin that it is negligible. Plug flow will be achieved if the sublayer thickness is much less than the pipe diameter (< where f is the Darcy friction factor (from the above equation or the Moody Chart), is the sublayer thickness, D is the pipe diameter, is the density, u* is the friction velocity (not an actual velocity of the fluid), is the shear on the wall, and is the pressure loss down the length L of the pipe. is the relative roughness of the pipe. In this regime the pressure drop is a result of inertia-dominated turbulent shear stress rather than viscosity-dominated laminar shear stress.
Read more about this topic: Plug Flow
Famous quotes containing the words determination of and/or flow:
“... the living, vital truth of social and economic well-being will become a reality only through the zeal, courage, the non-compromising determination of intelligent minorities, and not through the mass.”
—Emma Goldman (1869–1940)
“I candidly confess that I have ever looked on Cuba as the most interesting addition which could ever be made to our system of States. The control which, with Florida, this island would give us over the Gulf of Mexico, and the countries and isthmus bordering on it, as well as all those whose waters flow into it, would fill up the measure of our political well-being.”
—Thomas Jefferson (1743–1826)