Julia Zou (asker) Feb 21, 2008:

hc_ha, thank you very much for the links your provided! They are very helpful!

lhcm Feb 21, 2008:

Re: water blasting and free jet
The present invention is substantially different for all current technologies as it is specifically designed to take advantage of the unique conditions present in a high pressure nozzle and the resulting high velocity **free jet** which cause water to behave for very short periods of time as a non-Newtonian fluid.
http://209.85.173.104/search?q=cache:5pJPeBd8SFYJ:www.freepa...

Re: free jet and confined jet
(1). If the jet is fully submerged under the water, it is called submerged jet. In this case, it is not a surface jet, and there is no free surface effect. (2). The jet is confined, if there are walls nearby. This will limit the motion of the fluid. The jet without any walls nearby to limit its motion is called "free jet". Normally, a jet is a free jet. A confined jet can create complex flow recirculation. (3). If there is a wall in front of the jet, it is called impinging jet, because the jet will hit the wall. This is normally done on purpose, for example to heat, or cool the wall.
http://209.85.173.104/search?q=cache:nZPmmDQo5wYJ:www.cfd-on...


The particles beam is produced via a new technique called “Pulsed Microplasma Cluster Source” (PMCS) [8], consisting in*** blasting a cathode with a highly confined jet***, which removes atoms of the desired metal (in this case Titanium), subsequently condensed into clusters of dioxide and deposed on the substrate.
http://www.ieiit.cnr.it/~muselli/papers/imcs06.pdf

The results also indicated that a confined jet with a very slow coflow without recirculation can asymptotically approach the conditions of a free jet.
http://adsabs.harvard.edu/abs/1989PhDT........39H

lhcm Feb 20, 2008:

Alucrom has a very large number of equipment with all necessary sorts needed for surface treatment
of steel structure booth in paint shops and on site.
All our paint shops have separated in-built halls for painting and grit blasting all with full heating,ventilation and lightning. This we see as a must to be able to obtain the best possible conditions to achieve a good quality, satisfactory working conditions and external environment conditions.
The blasting chambers for grit blasting are built with recycling systems for blasting grit, including dust separation. This layout makes us able to work in a rational way with steel grit as abrasive.It also reduces the total quantity of waste when the material is recycled up to 20 times. Of course there are made regular analyses of the content of grease/oil and also the fractions of the material are sized up.

lhcm Feb 20, 2008:

Hydroblasting will not produce a surface profile. The surface profile exposed after hydroblasting is a product of earlier surface preparation work, or corrosion. ***The advantages of hydroblasting are that there is no ignition during the blasting process and that the surface will be free from grease and chlorides/salts, which will give the coating system a longer lifetime.*** The method is also environmentally friendly, as the disposal of spent abrasives is eliminated. Alucrom will assist customers in specifying the right surface preparation and the correct coating system for hydroblasted surfaces.