Fluid Jet Technology Research Articles

Design of Alternating Current Abrasive Magnetic Fluid Jet Generator Based on Permanent Magnet

During the test of DC(direct current) abrasive magnetic fluid technology,many bubbles and noises were generated near the graphite electrode , and the yellow green liquid was produced, which affected the further test.Through the study of graphite electrode, it was found that NaCl solution magnetic fluid produced hydrogen and chlorine gas after electrolysis. At the same time, chlorine gas dissolved in water to form yellow green liquid.The magnetic field of neodymium boron permanent magnet was equivalent to a mechanical stirring, which inhibited the production of chlorine gas.According to the difference of impressed current system, the abrasive magnetic fluid jet technology was divided into DC and AC(alternating current) .There was no electrode in AC abrasive magnetic fluid jet technology, so no gas or noise would be produced.The rotating magic ring permanent magnet produced alternating magnetic field, acting on the abrasive magnetic fluid to form an induced current.Under the action of the magnetic field, the electromagnetic force was applied to move along the circumferential direction to promote the motion of the abrasive magnetic fluid.

Research of Abrasive Suspension Magnetic Fluid Jet Technology

Through analyzing the existing abrasive jet technology, and discussing the MHD technology principle and its advantages, this paper proposes a new method of abrasive suspension magnetic fluid jet technology. The experimental device validates that conductive fluid can produce a boost effect Conductive fluid can produce a boost effect. This paper points out the key technologies involved in the new technology of the magnetic fluid jet of the suspended abrasive, and expounds the research status of the key technology and the main technical problems, and provides a new research direction for the development of abrasive jet.

Water jet for early treatment of chemical burn

The first necessity in the initial management of burn to remove from the wound the agent of burn and also any contaminants, clothes or foreign bodies. This is particularly important in chemical burns, because the agent may penetrate deeply into the skin and cause ongoing tissue destruction unless it is immediately and completely removed by washing or irrigation using saline or water. It is well known that irrigation with water is the most effective way both to neutralise and to remove chemical agents; however, some compounds may penetrate the epidermis and may remain after irrigation, so that tissue damage progresses. Complete removal of necrotic skin and tissue as soon as possible is the next step in burn treatment. This accelerates wound healing with or without dermal substitutes, particularly in superficial injuries. Debridement ideally removes all necrotic tissue in a single procedure, leaving behind viable undamaged tissue. This improves the quality of healing in firstand second-degree burns, and minimises the need for further wound revisions. The water jet system, based on fluid jet technology, has been advocated as an alternative to standard surgical excisional techniques for burn, The water jet is capable of adequately debriding superficial and partial-thickness wounds [1–4]. In this article we report on the use of water jet hydrosurgery in the early treatment of a hydrochloric acid burn.

Debridement of burn wounds with a water jet surgical tool

A new instrument, the Versajet™ system, based on fluid jet technology has recently been advocated as an alternative to standard surgical excisional technique for burn wounds. In this paper we describe our experience with this tool, the technique employed as well as its clinical feasability for debriding partial thickness burn wounds. Seventeen patients were evaluated for clinical efficacy of debridement of their burn wounds using the Versajet™ system. Burn wound areas of between 0.5 and 5% total body surface (TBSA) involving the face, arm, hand, leg and foot underwent debridement using the Versajet™ system. The Versajet™ system was able to sufficiently debride superficial partial thickness and mid-dermal partial thickness wounds for subsequent placement of Biobrane. Deeper partial thickness wounds could be excised for successful autografting. The Versajet™ system demonstrated some particular advantage in the surgical treatment of superficial to mid-partial thickness burns in areas like the face, hand and foot which can often be difficult to reach and contour with conventional modalities.

The debridement of hard to heal leg ulcers by means of a new device based on Fluidjet technology

Debridement plays an essential role in the wound-bed preparation of necrotic and sloughy ulcers, being a mandatory step to achieve a well-debrided bed, proceeding towards healing. This study reports our experience with Versajet [Versajet Hydrosurgery System (Smith & Nephew, Hull, UK)], a new device for the debridement of exudating ulcers, based on Fluidjet technology, which excises and aspirates the unwanted tissue by using the Venturi effect. In a 10-month time period, a total of 68 patients, out of a setting of 167 patients, hospitalised as affected by chronic, hard-to-heal leg ulcers, stuck in the inflammatory phase, were treated with Versajet. Based on ulcer characteristics and clinical conditions, the remaining 99 patients underwent traditional debridement with moist dressings (controls). In the majority of Versajet-treated cases (46), an adequately debrided wound bed was achieved with one operative procedure; two and three procedures were required in 17 and 5 patients, respectively. Almost all the procedures were performed in the ward at the patient's bedside. This procedure is quick (mean time per treatment is about 5 minutes); when compared with a traditional treatment with moist dressings, Versajet considerably shortens the in-hospital stay and promotes a quicker healing process. When used by an experienced surgeon, Versajet allows a selective debridement, as it makes it possible to remove only the tissue centred in the working end and spare the healthy tissue. Debriding with Versajet is highly effective in reducing the bacterial load of the ulcer bed. The pain caused by Versajet is well tolerated, especially when set for gentle debridement. If multiple treatments are required, the combined use with moist dressings is synergistic, as the dressings soften the necrotic tissue, thus facilitating the following Versajet debridement. The results indicate that Versajet offers more precision than standard mechanical debridement and, at high settings, offers an alternative to surgical debridement.

The debridement of hard to heal leg ulcers by means of a new device based on Fluidjet technology

The debridement of hard to heal leg ulcers by means of a new device based on Fluidjet technology

Wet comminution of raw salt using high-pressure fluid jet technology

Based on the impact mechanism and fluid wedge effect of the high-pressure fluid jet, a new approach to raw salt comminution has been worked out. The fluid jet comminution process has a unique characteristic of providing a fine appearance for the product particle as well as a high washing efficiency. Dissolution of raw salt and loss of product are avoided owing to saturated sodium chloride solution used as high-pressure medium. Compared with mechanical comminution, the product processed by this technique has higher quality and better appearance. The working condition is also improved since the comminution is operated under wet conditions. Also, this approach has the potential to be used to comminute the thermally sensitive, inflammable and explosive materials.

Findings of Fluid Jet Technology

Findings of Fluid Jet Technology