| 1. | Then the Euler momentum equation in the steady incompressible case becomes:
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| 2. | The streamwise momentum equation inside the boundary layer is approximately stated as
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| 3. | With the plane wave assumption for the derivatives, the momentum equation becomes
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| 4. | A usual choice of momentum equation for a particle is:
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| 5. | We begin with the incompressible form of the momentum equation.
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| 6. | In vertical coordinates, the momentum equation simplifies to the hydrostatic equilibrium equation.
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| 7. | Now the continuity and momentum equations will be averaged.
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| 8. | Thus we can simplify the vertical momentum equation to the hydrostatic equilibrium equation:
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| 9. | The momentum equation for each phase is less straightforward.
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| 10. | The next step is to plug in the pressure gradient into the momentum equation.
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