Newtonian Friction Law

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Newtonian Friction Law

The statement that the tangential force (i.e., the force in the direction of the flow) per unit area acting at an arbitrary level within a fluid contained between two rigid horizontal plates, one of which is motionless and the other of which is in steady motion, is proportional to the shear of the fluid motion

at that level. Mathematically, the law is given by
Τ = μ( Missing Image:img src="SP7_n_files/partderiv.gif"u / Missing Image:img src="SP7_n_files/partderiv.gif"z)

where Τ is the tangential force per unit area, usually called the shearing stress; μ is a constant of proportionally called the dynamic viscosity; and Missing Image:img src="SP7_n_files/partderiv.gif"u/Missing Image:img src="SP7_n_files/partderiv.gif"z is the shear of the fluid flow normal to the resting plate. Also called Newton formula for the stress. [[/a>|/a> ]]


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use