User:Life Ice Jet/Ice Jet
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Ice Jet Many industrial processes and specifically the AWJ machining, produce waste that is in the form of sludge in which waste material is mixed with water. The quantity of abrasive material produced in the waste is huge in the comparison to the quantity of residuals of workpiece material. Handling of this sludge is usually not critical since abrasive material is non-toxic, but in some applications the workpiece residuals can be harmful to the environment.
One of possible solutions is to substitute abrasive particles in AWJ with ice crystals and thus get rid of the majority of material in the waste sludge. The idea of Ice Jet was already tested as several authors reported (reference) but several issues are left to be solved. In the year 2010 a LIFE+ project with acronym IceJet started to overcome some of this issues.
Ice particles in the high speed waterjet can be generated based on two different principles. By the first principle water jet can be either partially frozen by addition of liquid nitrogen at -196ºC into the mixing chamber and so partially freeze some part of water droplets surrounding the high speed water jet. By the second principle ice particles are generated a priory outside of the mixing chamber and than injected in the water jet nearly as conventional abrasive. In both cases it is important to consider the temperature of ice particles, since mechanical properties (e.g. hardness) of ice particles and consequently machining ability is temperature dependent. Generally machining ability of ice particles increases with decreasing temperature.