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What is the normal viscous force(stress)?

by Makveger
Tags: forcestress, normal, viscous
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Makveger
#1
Mar8-12, 11:44 PM
P: 17
Hello,

I understand the tangential shear stresses (or forces) acting on a fluid element due to friction between moving fluid layers, but I can't imagine how viscosity might cause a normal force (on a fluid element)....explain please!
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boneh3ad
#2
Mar9-12, 08:44 AM
PF Gold
boneh3ad's Avatar
P: 1,507
Who ever said that it did? Viscosity can only cause normal stresses in a compressible flow where the divergence of the velocity field is nonzero. This is, however, bulk viscosity rather than the typical dynamic viscosity.


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