The accuracy of the numerical simulation in the prediction of cavita-tion in cryogenic fluids is of critical importance for the efficient design and performance of turbopumps in rocket propulsion systems. One of the main challenges remains the efficiency in modeling the physics, handling the multi-scale properties and developing robust numerical methodologies. Such flows involve thermodynamic p...

In this paper, a new non-contact ultrasonic abrasive finishing mechanism is designed and fabricated. This mechanism combines the function of ultrasonic vibrations and the magnetic abrasive finishing (MAF) process. A permanent magnet which is mounted on a horn has been used as the processing tool. This polishing tool is vibrated at an ultrasonic frequency with piezo-electric actuators. Ultrasoni...

Background: Chest x-ray has an important role in the diagnosis of tuberculosis (TB). The aim of this study was to determine the radiological changes in patients with smear positive pulmonary tuberculosis.Methods: In this study, 325 patients with smear positive pulmonary TB was enrolled. The affected lobe or lobes of the left or right lung were recorded. The types of involvement were categorized...

Pumping stations play an important role in agriculture development projects. Performance of the pumping stations should satisfy water requirements, and management. There are many problems face these pumping stations affecting their reliability and stability. Hydraulic problems are the most important item in the field of pumping station operation and design. Motivation of this research was prese...

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...

Numerical simulations are used to evaluate the damage potential of the shock-induced collapse of a pre-existing gas bubble near a rigid surface. In the context of shock wave lithotripsy, a medical procedure where focused shock waves are used to pulverize kidney stones, shock-induced bubble collapse represents a potential mechanism by which the shock energy directed at the stone may be amplified...

Through energy conservation and transformation perspectives, we numerically investigated the physical mechanism of cavitation generation surrounding two-dimensional NACA 0015 hydrofoil using mass-transfer model modified-RNG k-epsilon model. Cavitation is triggered by strong turbulent kinetic (TKE) with pressure below saturation pressure. However, development absorbs TKE as phase-change decrease...

We numerically investigate the effect of non-condensable gas inside a vapor bubble on dynamics, collapse pressure and impact spherical aspherical collapses. Free has damping that can weaken wave enhance rebound. To estimate this numerically, we derive validate multi-component model for bubbles containing gas. For cavitating liquid gas, employ homogeneous mixture with coupled equation state all ...

The use of power ultrasound refers to the application of sound that is just above the range of human hearing. Under these conditions, an acoustic wave is able to create very high levels of turbulence within an aqueous solution, through the generation of transient cavitation, the growth and violent collapse of microbubbles. Many scientists will be aware of the use of ultrasonic cell disruptors a...

Recent applications of ultrasound to the production of nanostructured materials are reviewed. Sonochemistry permits the production of novel materials or provides a route to known materials without the need for high bulk temperatures, pressures, or long reaction times. Both chemical and physical phenomena associated with high-intensity ultrasound are responsible for the production or modificatio...