Markus Resch, Rudolf Scheidl,
"A Model for Fluid Stiction of Quickly Separating Circular Plates"
, in Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering S., Vol. 228, Nummer 9, Seite(n) 1540-1556, 2014, ISSN: 2041-2983
Original Titel:
A Model for Fluid Stiction of Quickly Separating Circular Plates
Sprache des Titels:
Englisch
Original Kurzfassung:
Fluid stiction is a force which is created by the average pressure difference
between a fluid filled, narrow, quickly opening gap and the surrounding pressure. It plays a
negative role in compressor valve technology and in fast switching valves, since it hinders
an immediate response of the valves to a changing driving force situation. In this paper the
axisymmetric fluid stiction problem is studied by analytical mathematical models and
experiments performed on a specific test rig. The study shows that the stiction force in
narrow gaps is dominated by the viscous flow as described by the Reynolds equation for
lubricating gaps and by cavitation which occurs in a centre region if the gap opening speed
exceeds a critical value. The cavitation zone first extends and then shrinks and, finally,
gives rise to complex oscillation phenomena due to the impact of the fluid when the
cavitation zone collapses. It was found experimentally that fluids can create negative
pressure for very short time. Measures to limit the stiction force are a large initial gap
height or additional fluid supply channels from the surrounding to the gap.
Sprache der Kurzfassung:
Englisch
Journal:
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering S.