www.ireng.org Flowing medium Erosion
Type of erosion / Start condition
Thermal erosion Jet wear (erosion)
Hydro-abrasive wear Flushing wear
Abrasive corrosion Droplet impact
Flow-cavitation (Oscillation-cavitation)
Combined wear Erosion, Cavitation, Corrosion (wear & tear)
Table 1 Q Q Q Q Q Q Gas Q Q Q Q
Q Q
Q (Q)
Q Q
Liquid Neutral Corrosive
Solid particles (abrasive)
Droplets Ablative destruction
Depressions, Undulations, Penetrations
Undulations, Depressions, Wash-outs
Undulations, Depressions
Hole-formation, Flow-patterns
Roughening, Penetration Moving medium Characteristic
Technical Paper Appearance,
Process, End result
hitting the surface, e.g. at gravitational tangential flow in a hopper the degree is low because there will be less movement in the surface layer.
The typical wear patterns appear due to the angle of impingement, especially the kind of the flow regime, resulting in pits, troughs, shouldering undulations and other forms of wash-outs.
5.3 Friction wear
Friction
Angular Impact
Jet wear Depending on the angle of impact distinction can be made between:
Type of Wear
Friction Wear
Angular Jet Wear
Jet Wear
Movement or type of Impingement
Friction / Polishing
Between friction and vertical
Almost Vertical
Impingement Angle
α ~ 0 0 > α > 90 α about 90
Impact Load
Friction
Friction & Impact
Impact
The shape of particles plays an important role when the ratio Habr large, coarse grains are much more abrasive than rounded ones.
/Hmat is
Typical example of Vortex wear in a gas outlet of a swirl tube separator (Note: the wavy shaped surface due to the oscillating vortex)
March 2019 Issue ENGINEER THE REFRACTORIES 19
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