Abstract
To study the effects of bubbles (or cavities) collapse on a solid surface, a rotating disk device was used here to create bubbles (or bubbles) in water. In the apparatus, these bubbles are led to collapse on the surface of carbon steel (commonly used in structures and machine impellers), and so related to higher costs for the hydraulic machines industry when damaged by such phenomenon, for example. After that, the specimens are observed with the aid of a scanning electronic microscope, where the damages on the specimens are analyzed showing pits and approximate circular areas on their surfaces. An explanation is presented here, based on collapse simulations (for qualitative purposes) and their result using images of the specimens after the collapses to visualize the damages caused by prints on their surface. The pits are certainly made by liquid micro-jet impingement while the areas, showing some aspects of burning, are credited to the high temperature impaction of the bubble contents in the final stages of its collapse.
Highlights
IntroductionWhen water vapor and air bubbles (or cavities) collapse near solid surfaces, damage may occur [1]
When water vapor and air bubbles collapse near solid surfaces, damage may occur [1]
To study the effects of bubbles collapse on a solid surface, a rotating disk device was used here to create bubbles in water. These bubbles are led to collapse on the surface of carbon steel, and so related to higher costs for the hydraulic machines industry when damaged by such phenomenon, for example
Summary
When water vapor and air bubbles (or cavities) collapse near solid surfaces, damage may occur [1]. The cavitation phenomenon, that is, the formation, growth and collapse of air and vapor bubbles in liquids is, as well known, responsible for damage in metallic and non-metallic solid structures operating in liquid mediums, remarkably (but not limited to) the water. Such damages are responsible for greater costs to the machine hydraulics and rockets industry, since the process may occurs to rocket fuels as well. An already known damage mechanisms is mostly by liquid micro-jets impingement on a solid surface.
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