"Big whorls have bigger whorls that feed upon velocity.
Small whorls have smaller whorls, and so-on 'till viscosity." - Anon
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"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Viscosity can be Newtonian or non-Newtonian. A Newtonian fluid has a linear strain rate vs stress curve. Wikipedia has a pretty good article. Did you think of going there?
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"Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone." - Ayn Rand