Abstract
An optical interferometric technique has been used to determine the 3-D shape of cavitation erosion pits. The method which is particularly suitable to the determination of pit diameter and pit depth is used for a statistical analysis of cavitation erosion pits. We analyzed numerous samples which were eroded at various velocities with two different fluids (mercury and water) on two geometrically similar venturi test sections of different length scales. General properties of histograms of pit size are pointed out. The influence of flow velocity on pitting rates corresponding to limited ranges of pit size is discussed. The contribution of each pit diameter to the total eroded surface is analyzed. Some results are given on pit depths and pit volumes.
Highlights
In cavitation erosion studies, several techniques may be used to quantify the damage on a material as pit counting (Stine bring, 1976), measurement of mean depth of deformation (Kato, 1975), or weight loss
5 Influence of Flow Velocity In the present section, we examine the dependence of pitting rate with flow velocity
This paper presents an analysis of histograms in size of erosion pits
Summary
A Statistical Analysis of Cavitation Erosion Pits. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. An optical interferometric technique has been used to determine the 3-D shape of cavitation erosion pits. The method which is particularlysuitable to the determination of pit diameter and pit depth is used for a statistical analysis of cavitation erosion pits. The contribution of each pit diameter to the total eroded surface is analyzed. M. Michel lnstitut de Mecanique de Grenoble, Grenoble, France
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