Momentum Thickness

Definition

The Momentum Thickness ($\theta$) is the distance that corresponds to the momentum flux deficit in the boundary layer compared to potential flow.

Formula

$\theta = \int_0^\infty \frac{u(y)}{U_e}\left(1 - \frac{u(y)}{U_e}\right) dy$

Relationships

• Related: Boundary Layer, Displacement Thickness