Cavitation due to an impacting sphere
نویسندگان
چکیده
Cavitation associated with the impact of a sphere on a flat surface is investigated using high-speed photography. The sphere, of diameter 15 or 45 mm and made from Ertacetal or stainless steel, was fully submerged and accelerated using a spring-loaded mechanism to achieve Reynolds numbers based on impact velocity and sphere radius of up to 7.2×10. The static pressure and impact velocity were varied to achieve cavitation numbers ranging from 8.9 to 120.9. High-speed photography of the impacting sphere and induced cavitation bubble was filmed at 105-140 kHz. A log law relationship was found between the non-dimensional maximum bubble radius and the cavitation number. The relationship was modulated by the material properties. Interaction between the sphere and the bubble was also noted.
منابع مشابه
Cavitation in a lubrication flow between a moving sphere and a boundary.
A heavy sphere is free to move inside a rotating horizontal cylinder filled with viscous liquid. The steady motion is essentially Stokesian, and the sphere rotates at a fixed location with a lubrication layer between the ball and the wall. The symmetry of the flow field suggests there will be no force to balance the normal component of the ball's weight. However, we show that a normal force can...
متن کاملModeling the Fracture of a Sandwich Structure due to Cavitation in a Ductile Adhesive Layer
The strength and durability of adhesively bonded sandwich structures often depend on the mechanisms of fracture, which in turn depend on the properties of the adhesive and the microstructures of the interface. When the thin adhesive layer is ductile, cavitation either within the layer or along the interface is often the dominant failure mechanism. In the present paper, fracture due to cavity gr...
متن کاملNumerical Solution for Gate Induced Vibration Due to Under Flow Cavitation
Among the many force s to which hydraulic structures are exposed to, the forces induced by cavitation incident are of typical hydrodynamic unknown forces. The aim of this study is to define these forces as coupled fluid-structure interaction under two dynamic effects. The first dynamic effect which incorporates facilities for dealing with cavitation fluid is based on the appearance and bursting...
متن کاملViscous effects on the position of cavitation separation from smooth bodies
Flow visualization by the schlieren technique in the neighbourhood of a fully developed cavity on two axisymmetric headforms has shown the existence of laminar boundary-layer separation upstream of cavitation separation, and the distance between the two separations to be strongly dependent on Reynolds number. Based on present results, a semi-empirical method is developed to predict the position...
متن کاملCavitation Process and the Performance of Some Ferrous and Non-Ferrous Alloys
"> In this research an extensive literature search into the mechanism of cavitation dynamics and its consequences was conducted. A cavitation venturie rig was designed <span style="font-size: 10pt; col...
متن کامل