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Corresponding Author

Hosien, mohamed

Subject Area

Mechanical Power Engineering

Article Type

Original Study

Abstract

The main purpose of this paper is to investigate the effect of throat velocity on cavitation erosion rate in steady –state period and examine the existence of power law between the erosion rate and the flow velocity and evaluates the velocity exponents. Weight loss rate tests were conducted in a cavitation water tunnel in velocity range 24-42.5 m/s at constant cavitation number for three different shapes of cavitation inducer and various inducer sizes ranging from 15 to 27 mm. The erosion of 99 percent pure aluminum was determined using a sidewall specimen for the three inducers and using the cylinder itself as specimen. For all specimens and operating conditions, weight loss rate was found to be strongly dependent on the flow velocity and the weight loss rate varied with some power of the velocity (WLR∝U^e) . The velocity exponents obtained in the present work ranged from 3 to 12.62 depending on the source shape and size and the place of erosion. The experimental results indicated that the velocity exponent was proportional to the size of the inducer raised to two characteristic exponents: in the size range 15-20 mm was of order 0.47 but for size of 20-27 mm the exponent was about 1.85 for all sidewall erosion specimens. The two exponents were independent of the geometry of the inducer. However, for erosion of cylinder itself as a specimen the two exponents were 0.15 for size 15-20 mm and 2.67 for size 20-26 mm

Keywords

Cavitation; Erosion; Velocity exponent; Cavitation number; weight loss

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