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Momentum equation for the 1D trajectory stationary incompressible Inviscid fluid flow with no contact forces (a partial case of Euler equation ):

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\frac{p(l)}{\rho} +  \frac{u^2}{2} -  g \cdot l \cdot \cos \theta   = \rm const

where

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bodyz(l)

elevation along along the 1D flow trajectory 

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bodyl

measured length  along the 1D flow measured length along the trajectory 

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body\theta

trajectory inclination

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body\rho

Fluid density

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bodyu=u(l)

fluid velocity along the trajectory

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bodyp=p(l)

fluid pressure along the trajectory

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