Large-eddy simulation of flow over an open cavity corresponding to the experimental setup of Liu and Katz [1] is performed. The flow Reynolds number based on the cavity length and the free stream velocity is 170,000. The filtered, incompressible Navier-Stokes equations are solved using a co-located grid finite-volume solver with the dynamic Smagorinsky model for subgrid scale closure. The compu...

During the deep reactive ion etching process, the sidewalls of a silicon mold feature rough wavy structures, which can be transferred onto a polydimethylsiloxane (PDMS) microchannel through the soft lithography technique. In this article, we utilized the wavy structures of PDMS microchannel sidewalls to initiate and cavitate bubbles in the presence of acoustic waves. Through bubble cavitation, ...

doi: 10.1111/j.1399-3054.2006.00644.x Previous studies indicate that conifers are vulnerable to cavitation induced by drought but in many cases, not by freezing. Rarely have vulnerability to drought and freezing stress been studied together, even though both influence plant physiology and the abundance and distribution of plants in many regions of the world. We studied vulnerability to droughta...

The physics and mechanism of sheet/cloud cavitation in a convergent–divergent channel are investigated using synchronized dynamic surface pressure measurement high-speed imaging water tunnel to probe the cavity shedding mechanism. Experiments conducted at fixed Reynolds number Re = 7.8 × 10 5 for different values σ between 1.20 0.65, ranging from intermittent inception cavitation, sheet quasi-p...

Digital photography of cavitation in narrow gap flows, e.g., lubrication films journal bearings or squeeze film dampers, demands a high time-resolution and solution to approaching the particular spatial restrictions. Typically, thickness is range few microns characteristic time for vapor bubble generation collapse about one millisecond, respectively. The authors have developed Journal Bearing M...

This short review provides the current state-of-the-art of in situ coupling of ultrasound to chemical deposition methods. A synergetic action of the ultrasound and light radiation or electrical fields may result in new powerful methodologies, and these include sonophotodeposition and sonoelectrodeposition processes. The effect of ultrasound is explained on the base of different physical mechani...

Diaphragm pumps often experience cavitation and subsequent fluid flow oscillation when delivering an organic in small/micro scale Rankine cycle (ORC). The behaviour of diaphragm has rarely been investigated for fluids so far. Three-dimensional, unsteady cavitating flows R245fa a pump were simulated with ANSYS 2019R2 CFX suction stroke terms the k -? turbulence model, ZGB rigid body motion model...

Globe valves are one of the oldest types of valve used for throttling applications for all sizes due to better controllability and wider range. One of the major limitations associated with the use globe valves in liquid application is cavitation and it takes place both in part open and in fully open conditions due to varied reasons. There are different designs of globe valves available but for ...

Design and manufacturing technologies have promoted the use of composites in hydrodynamic lifting surfaces. Composites, even with state-of-the-art coatings, are susceptible to cavitation erosion damage. This work aims design a cavitation-free composite surface maximize efficiency while ensuring structural integrity. We optimize canonical hydrofoil using gradient-based optimization framework tha...