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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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