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Matteo Cantiello edited Convective Velocities.tex
over 9 years ago
Commit id: c7112058b8c3aec0242164301fcde08d605b5d43
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\begin{equation}
\bar{v}^2 = - \frac{1}{8} g (\Delta \rho (\lambda)/\rho) \lambda.
\end{equation}
Relating $\Delta \rho$ and $\Delta T$ requires the equation of state for the gas $\rho = \rho (\mu, T,
\P)$. In general we \P)$, which in differential form can
be written as
\begin{equation}
\D\rho = \bigg(\frac{\partial \rho}{\partial \mu} \bigg)_{\P,T} \D\mu + \bigg(\frac{\partial \rho}{\partial T} \bigg)_{\P,\mu} \D T + \bigg(\frac{\partial \rho}{\partial \P} \bigg)_{\mu,T}
\D\P,
\end{equation}
or
\begin{equation}
\D\rho = \frac{\rho}{\mu}\bigg(\frac{\partial \ln \rho}{\partial \ln \mu} \bigg)_{\P,T} \D\mu + \frac{\rho}{T} \bigg(\frac{\partial \ln \rho}{\partial \ln T} \bigg)_{\P,\mu} \D T + \frac{\rho}{\P} \bigg(\frac{\partial \ln \rho}{\partial \ln \P} \bigg)_{\mu,T} \D\P
\end{equation}
write, assuming again pressure equilibr