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\frac{\partial (\rho_m A)}{\partial t} + \frac{\partial}{\partial l} \big( A \, sum_\alpha \rho_m\alpha \, u_m\alpha \big) = 0 |
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\frac{dp}{dl} = \rho_m \, g \, \sin \theta - \rho \, u_m \, \frac{du_m}{dl} - \frac{ f_m \, \rho_m \, u_m^2 \, }{2 d} |
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