Do cryoglobulins exhibit thixotropy? It might be an interesting way of
utilising a viscometer.
However returning to the original attempted solution to the problem. It
should be noted that relating change of viscosity with temperature is
not as simple as it seems. One of the best approximations of the
relationship of viscosity to temperature was by Andrade (b 1887) whose
expression was:
nv^1/3 = Ae^b/vT
Where:
A and b are constants
v is the specific volume at absolute temperature T
n (Greek eta), is the viscosity, but not the kinematic viscosity
however.
e (usually Greek small epsilon) stands for something I can't remember as
my lecture notes have become illegible!!
I can remember, however, that this equation did not work for water!!
Beware of viscosity, it used to sort out the men from the boys in
Physics and Chemical Engineering. It certainly sorted me out! I just
love the way it is used and measured so casually, even in Haematology.
--
Dr Henry Chandler
St George's
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