Kavitation (dannelse af gashulrum i væske) er et fænomen, der kan opstå, hvis en skrue, propel eller lignende drejer for hurtigt, således at det omgivende vand ikke kan følge skruens form. Dette resulterer i, at vandet slipper skruen og i princippet danner gasbobler. Dette kaldes kavitation og det resulterer i tabt energi, støj rystelser og nogle gange synlig sonoluminescens.
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Kavitering kan skade skruen grundet de dannede rystelser, når dele af skruen hamrer ind i væsken igen – eller grundet boble-implosionsstøj. Dette kalder man kavitations-slid.
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