If a hydraulic system is designed to operate with a homogeneous liquid, additionalvapor structures due to cavitation can be interpreted, by analogy with the caseof mechanical systems, as mechanical clearances. The vapor structures are oftenunstable, and when they reach a region of increased pressure, they often violentlycollapse since the internal pressure hardly varies and remains close to the vaporpressure. The collapse can be considered analogous to shocks in mechanicalsystems by which clearances between neighboring pieces disappear
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