Sheet cavitation

Traveling cavitation is a type of cavitation in which individual transient cavities or bubbles form in the liquid and move with it as they expand or shrink during their life cycles. To the naked eye traveling cavitation may appear as sheet cavitation. 

Sheet cavitation is also known as fixed, attached, cavity or pocket cavitation. Sheet cavitation is stable in a quasi-steady sense. The liquid vapor interface becomes wavy and breaks down in the closure region of the cavity. Downstream flow, which contains large scale eddies, is dominated by bubble clusters. 

Figure 12. Results of simultaneous SAXS and tensile testing of acrylic sheet materials. (a) Results for the AS material show the formation of crazes during deformation. (b) Results for RTAS-8 show that the deformation processes that induce yielding are dominated by particle cavitation. The contour scattering patterns were obtained at the points indicated on the stress-strain curves.

Some of the problems that foam and entrapped air can cause are the cavitation of pumps creating runnability problems, slowing of the drainage through the sheet, deposit formation in the press and dryer sections and the formation of pinholes in the sheet. 

In 4.28A as the mpld OjSMis, the core together with the product withdraws ftom the cavit ISr iitesrtoll df the arrow. The product can then be simply (Sheeted (in the direct tt Mite shwfarro without meeting any resist-... 

It is expected from experimental research that sheet-cloud cavitation causes most of the sound production by a cavitating ship propellor. Therefore Omta [ 2] analysed the sound production of a spherical bubble cloud analitycally. At MARIN the results of Omta where verified in a water tunnel [3]. In these experiments the sound radiation of a bubble stream, injected into the fluid near a two dimensional hydrofoil, was measured. These bubbles where injected both intermitted and continouosly, in order to distinguish a cloudy bubble stream and a continuous bubble stream. The remarkable result of this research was that no difference between the two, above mentioned, situations was observed. 

---