How does low ambient pressure effect on the thickness of the boundary layer for given flow conditions of gas?
In absolute vacuum the thickness of the boundary layer is 0 of course, but it seems that all the boundary layer thickness correlations use the Reynolds number, which doesn’t change much vs pressure for given flow conditions (the kinematic viscosity is roughly independent of pressure).
How can we explain it?
In absolute vacuum the thickness of the boundary layer is 0 of course, but it seems that all the boundary layer thickness correlations use the Reynolds number, which doesn’t change much vs pressure for given flow conditions (the kinematic viscosity is roughly independent of pressure).
How can we explain it?