Just as a soggy paper straw is prone to yielding under the applied suction of a thirsty drinker, the xylem tracheids in leaves seem prone to collapse as water potential declines, impeding their function. Here we describe the collapse, under tension, of lignified cells peripheral to the leaf vein of a broad-leaved rainforest conifer, Podocarpus grayi de Laub. Leaves of Podocarpus are characteriz...

Jetting mechanisms in cavitation bubbles play a crucial role the destructive forces of cavitation. Depending on application, these can have desirable effects like medical treatments or catastrophic erosion ship propellers. Still today, thorough understanding all details complex bubble collapse scenarios is lacking. Hence, this work, we numerically investigate jetting for air pairs water followi...

High-speed video imaging was used to study the dynamic behavior of cavitation bubbles induced by a continuous wave (CW) laser into highly absorbing water droplets containing copper nitrate (CuNO4). The droplet lays horizontally on a glass surface and the laser beam (λ=975 nm) propagates vertically from underneath, across the glass and into the droplet. This beam is focused z=400 μm above the gl...

The Rayleigh collapse time is the it would take to shrink an empty spherical bubble in infinite liquid domain zero size, which a function of ambient pressure and initial radius. If solid boundary located vicinity shrinking or collapsing bubble, then flow hindered, such that prolonged. This can be quantified with prolongation factor $k$ . Here, we provide for intermediate smallest wall stand-off...

In this paper the Potsdam Propeller Test Case is numerically investigated in oblique inflow conditions. We consider three different topics: open water performance curves, cavitation observations, and pressure pulses induced by propeller to ceiling of tunnel. flow case, not uniform from perspective propeller, which results dependency blade loading on rate frequency. The numerical simulations wer...

Abstract Sonochemistry studies chemical and physical effects in liquids submitted to power ultrasound. These arise not from a direct interaction of molecules with sound waves, but rather the acoustic cavitation: nucleation, growth, implosive collapse microbubbles The violent implosion bubbles leads formation chemically reactive species. In principle, each cavitation bubble can be considered as ...

Cavitation erosion often occurs on the surface of many underwater applications, which can cause severe damage to materials and reduce their performance. Since is impact pressure induced by collapse an individual cavitation bubble near wall, make a better prediction prevent potential, in this paper, we carry out systematic investigations characteristics direct numerical simulation using vapor mo...

The objective of this study is to investigate the collapsing behavior cavitation, which leads erosion material. An experimental examination was conducted in a channel with semi-circular cylinder obstacle, serves as “vortex cavity” generator. Cavitation achieved by employing range pressure differences over test section and high-speed camera used observe cavitation behavior. flow field behind inv...

Blast induced traumatic brain injury (bTBI) has been a prevalent in recent conflicts. Post-mortem studies have shown damage the tissue close to cerebrospinal fluid (CSF) bTBI cases compared non-blast TBI cases. CSF cavitation is potential mechanism for this brain/CSF interface injury. In study, our aim was explore possibility and of blast cavitation. We first developed one-dimensional simplifie...

In this study, the cavitation effect induced by two charges in underwater explosions near free surfaces is numerical researched dimensional compressible multiphase fluids based on a four-equation system with phase transition model. The occurrence of generation, development, and collapse two-charge can be captured directly. detailed density, pressure, vapor volume fraction contours during intera...