Solution

Past exam of the mathematics course of the University of Cambridge / 2002 / iii / Paper 46 / 2 / ii / Solution

{title2=$\mu=4c/(9\kappa)$}

Combining $F=c\Omega^2z/\kappa$ with viscous heating $dF/dz=(9/4)\mu\Omega^2$ gives a height-independent <dynamic viscosity> $\mu=4c/(9\kappa)$ under constant <opacity>. This exact limiting relation differs from an approximate vertically averaged <alpha disk> closure.

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 Incoming links: Constant viscosity in radiation-supported vertical balance