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发表于 2005-7-12 01:38:39
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[请说说广义牛顿流体的定义
A Generalized Newtonian Fluid is an idealized fluid for which the shear stress, τ, is a function of shear rate at the particular time, but not dependent upon the history of deformation.
τ = F(du/dy)
where: ∂du/dy is the shear rate or the velocity gradient perpendicular to the plane of shear (SI unit s-1).
The quantity
Mu(Effective) = τ /(du/dy)
represents an apparent or effective viscosity as a function of the shear rate (SI unit Pa•s).
The most commonly used types of Generalized Newtonian Fluids are:
Power-law fluid
Cross fluid
Carreau fluid
Moldflow second order fluid
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