Effect of Deterministic Asperity Geometry on Hydrodynamic Lubrication

摘要: This paper presents a numerical study of the effects different shapes deterministic microasperities in sliding surface lubrication when hydrodynamic films are found. Positive (protruding) and negative (recessed) asperities constant height (depth) considered with circular, square, diamond, hexagonal triangular cross-sections. Of particular interest is impact asperity/cavity cross-sectional geometry on friction leakage, which has importance sealing applications. The results indicate that coefficient insensitive to shape, but quite sensitive size cross-section. By contrast, leakage rates found be both shape size, giving smallest rate square largest rate. minimum for all occur at an asperity area fraction 0.2 positive 0.7 asperities. Finally, existence critical where performance curves cross over These cross-over points identified