Unformatted text preview: mpler when studying a problem to first examine it without friction and then add the friction forces later, or only add them where they are significant. Friction in a fluid occurs through viscosity. It acts on a body through shear stress, τ, and is related to a fluid property, µ [kg/m‐s], the viscosity or dynamic viscosity. Note that u is the x‐component of velocity so u and y are orthogonal. µ is a property of the fluid. It generally depends on temperature. For example cold oil has higher viscosity than warm oil There is also a fluid property, ν = µ/ρ [m2/s] For air at STP 1.79 10
/ ∝√ Tables from the inside cover of Munson, Young and Okiishi, “Fundamentals of Fluid Mechanics,” 3rd ed. New York (Wiley & Sons) 1990. An invis...
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