Cavitation is harmful to water turbines and may cause operation delays of several weeks. The real-time detection of cavitation risk is increasingly important, and even narrow cavitation-free power ranges can be utilised in load optimisation. Higher derivative signals x and x calculated from acceleration signals are very suitable for detecting impacts. This paper introduces a generalised moment ...

The effects of cavitation on vortex dynamics in a submerged, two-dimensional, planar laminar forced jet were studied numerically. A locally homogeneous cavitation model that accounts for nonlinear bubble dynamics and bubble/bubble interactions within spherical bubble clusters was employed. The effects of varying key  ow and cavitation model parameters on  ow/cavitation interactions were inves...

BACKGROUND AND AIMS Extreme water stress episodes induce tree mortality, but the physiological mechanisms causing tree death are still poorly understood. This study tests the hypothesis that a potted tree's ability to survive extreme monotonic water stress is determined by the cavitation resistance of its xylem tissue. METHODS Two species were selected with contrasting cavitation resistance (...

In the therapeutic ultrasound field, the cavitation frequently forms a bubble cloud that consists of many microbubbles. A method to control the violent collapse of cloud cavitation is being developed. It is comprised of two frequency ultrasound. The first is a higher frequency ultrasound waveform that makes cloud cavitation at the surface of the object. The second is a lower frequency waveform ...

Introduction: Acoustic transient cavitation is the primary mechanism of sonochemical reaction and has potential use for tumor treatment. In this study, the in vivo anti-tumor effect of simultaneous dual-frequency ultrasound at low-level intensity (ISATA < 6 W/cm2) was investigated in a spontaneous murine model of breast adenocarcinoma in Balb/c mice. Materials and Methods: Forty tumor bearing m...

To gain insight into the large toughness variability observed between metallic glasses (MGs), we examine the origin of fracture toughness through bending experiments and molecular dynamics (MD) simulations for two binary MGs: Pd82Si18 and Cu46Zr54 The bending experiments show that Pd82Si18 is considerably tougher than Cu46Zr54, and the higher toughness of Pd82Si18 is attributed to an ability to...

As one of the important factors affecting stability slide valves, analysis and research flow force are great significance. In recent years, more experts scholars have conducted in this field, attempting to find methods reduce or utilize hydraulic spool valves. Flow includes steady-state transient force, with having most significant impact on The influencing complex diverse, including cavitation...

One of the causes of the breakdown of the mechanical heart valves (MHVs) is cavitation. A reliable in vitro test method to evaluate the cavitation potential has to be developed for the patients’ safety. It is the bubble implosion that damages the materials, thus observing the cavity implosion behavior is essential. According to sonoluminescence, the collapsing cavitation bubbles emit the faint ...

The temporal and spatial dynamics of cavitation bubble cloud growth and collapse in extracorporeal shock wave lithotripsy (ESWL) is studied experimentally. The first objective is obtaining reproducible cloud patterns experimentally and comparing them with FDTDcalculations. Second, we describe a method to modify the cavitation pattern by timing two consecutive pressure waves at variable delays. ...

The phenomenon of cavitation was investigated in an Enac-Osada ultrasonic unit using a #15 CaviEndo file 25-mm long. The observed cavitation was incorporated in a subsequent study which investigated the effects of cavitation on debridement, One group of 10 teeth was subjected to the cavitating file while a second group served as a control. Scanning electron microscopic observations revealed tha...