The paper describes the results of numerical study of flow in the exhaust jet of turbofan engine CFM 56-3. Influence of computational domain decomposition, grid refinement and flow model on the jet flow field is discussed. Special attention is payed to simulation of nucleation and condensation processes in the exhaust jet. Growth of water clusters in the jet and cluster distribution in size are...

The increasing use of high-pressure water jets in the industry for machining materials yields numerous studies aiming at the optimization of this technology. Since the experimental study of pure or abrasive water jet cutting is complex to carry out, the numerical simulation of this process stands as an attractive alternative. Such a simulation relies on the coupling of numerical tools devoted o...

Article history: Received: 09.06.2015. Received in revised form: 01.10.2015. Accepted: 08.10.2015. Liquid nitrogen is expected to be used as a jet medium in petroleum engineering because of its cryogenic and non-polluting characteristics. To identify the velocity distribution characteristics of liquid nitrogen jet, a computational fluid dynamics model was built by coupling the equations for nit...

An experimental investigation has been carried out to study the cooling of a hot horizontal Stainless Steel surface of 3mm thickness, which has 800±10°C initial temperature. A round water jet of 22 ± 1C temperature was injected over the hot surface through straight tube type nozzles of 2.5-4.8mm diameter and 250mm length. The experiments were performed for the jet exit to target surface spacing...

BACKGROUND AND OBJECTIVES Hydro-Jet technology has long been used for cutting various materials like metal and wood in the industrial field. In the medical field, this technology has been applied successfully for selective cutting of the parenchyma of the liver. However, to our knowledge, no data exist on the use of the Hydro-Jet technique for laparoscopic cholecystectomy. The purpose of this s...

The topic of water jet orifices efficiency and effectiveness evaluation has been considered in this paper. The performed analysis is based on the evaluation of the discharge, velocity and contraction coefficients for different water orifices. In order to overcome the difficulty to measure the water velocity at the orifice exit, which can reach 900 m/s in case of pure water jet applications (wit...

In the paper, the enhanced measurements of the laser micro-jet processing are discussed. In fact, within pure water breakdown threshold of laser, the less focal which focused with the appropriate focusing lens and the small nozzle of water chamber enhance the laser power density ,at the same time, the laser beam transport in the wave guided water with the proper total reflection angle. The las...

127 Autologous fat grafts have been used to treat tissue deficiencies for over 100 years.1 They have been considered the ideal softtissue filler by most investigators, because they are inexpensive, abundant, and easy to obtain.2 However, the potential high absorption rate (25 to 90 percent) of grafted fat, which may be attributable to damage to the grafts caused by tissue harvesting and graftin...

1. Introduction Implosion of surface waves and the resulting formation of a central vertical water jet happen often in nature; they also provide an important analogy for many physical phenomena. For example, when a heavy solid object impacts on a fluid surface, e.g. such as a meteoroid hitting the planet's ocean, a crater is created, which subsequently begins to pinch radially due to the pressu...

Increasing experience with major hepatic resections has stimulated the development of improved resectional techniques and tools. A new high velocity water jet dissector is reported which offers significant advances over previously developed ultrasonic and low pressure water jet machines. It has been successfully used in 8 major hepatic resections with minimal blood loss, excellent visibility an...