|Mar30-08, 01:32 PM||#1|
Stokes Law, Viscosity. (very simple)
I'm trying to find the viscosity of some glycerol that we dropped various steel balls down using the equation:
V = [2r^2 (p – σ) g] / 9η
I put in these values:
p = 7800 kg m-3
σ = 1200 kg m-3
g = 9.8 m s-2
And ended up with the equation. η = 129360r^2 / 9V
My problem is that I thought viscosity is a constant. When I put my values in the viscosity decreases as radius decreases.
|Mar30-08, 01:46 PM||#2|
Viscosity is constant for constant temperature, but the coefficient of drag is dependent on size.
There is momentum exchange normally as well as by shear (viscous effects).
|Mar30-08, 01:52 PM||#3|
Ok thanks, so i must've made a mistake somewhere...
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