A number of factors that influence the magnitude of erosion include geometry, material of the impacting surface, impact angle, particle size and shape, particle velocity, flow condition and fluid properties. Among the various factors, particle size and velocity has been considered to be most important parameter that causes erosion. Particle size and velocity are influenced by surrounding flow velocities and carrying fluid properties. Higher erosion rates has been observed in gas solid flow in geometry where the flow direction changes rapidly such as elbow, tee, valves, etc due to local turbulence and unsteady flow behaviors. This paper presents the results of a Computational fluid dynamics (CFD) simulation of dilute gas-solid flow through a 90 degree elbow due to dynamics behavior of entrained solid particles in the flow. The effect of particle size and the corresponding location of erosion were investigated for 50, 100, 150, 200, 250 and 300 μm sand particles for three different flow velocities (15, 30 and 45 m/sec). The magnitude and location of erosion presented in the paper can be used to determine the areas susceptible to maximum erosive wear in the geometry along with corresponding rate of metal loss in these areas.

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