A fluid film is repeating profile irregularities and form the regular waves when the fluid film falling on rough surface.
The length of these waves (distance between nearby peak of waves) depends on the distance between nearby profile peaks.
Number of “standing waves” matches number of profile peak under fluid film.
Difference between gravity waves and “standing waves” is that the gravity waves are moving down on the free surface of fluid film.
“Standing waves” are not moving.
Position of peak and valley of “standing waves” coincide with peak and valley of the roughness.
Proposed structured packing has no roughness (height of profile peak smaller than the thickness of fluid film).
On this structured packing standing waves are appearing as a result of corrugation of the packing element.
February 2014
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