Displacement-ventilation interface height
= Displacement-ventilation interface height
{title2=$h$}
At steady state, the displacement-ventilation interface lies where the total plume <volume flux> equals the imposed ventilation flux. For one triangular-profile <wall line plume> with kinematic <buoyancy flux> $B_0$, entrainment coefficient $\alpha$, and ventilation flux $A$ per unit span,
$$
h=\left(\frac{2}{3\alpha}\right)^{2/3}\frac{A}{B_0^{1/3}}.
$$