Dear Researcher,

There is a porous film acting as a barrier between a high-pressure section (right side) and a low-pressure (vacuum, left side) section. Molecules can pass through the porous film, compromising the vacuum, which necessitates the continuous operation of the vacuum pump.

If there are patterns on the left side of this film, how would these patterns affect the hydrodynamic flow on the vacuum side compared to a flat surface?

Any theory is welcome.

Best regards