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\section{MLT}  \subsection{Convective Flux}  In the ``Mixing Length Theory'' of convection it is assumed that an element of fluid rises in pressure equilibrium and retains its identity while it moves through a radial distance $\Delta r$, after which it mixes with its surroundings, releasing its excess heat energy. The distance $\Delta r$ is called mixing length and is usually denoted as $\lambda$.  The heat transferred by upward moving elements can then be quantified as:  \begin{equation}