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Experimental measurements of bulk modulus of two types of hydraulic oil at pressures to 140MPa and temperatures to 180°C
Shudong Yang, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, China
Bulk modulus of hydraulic oil represents the resistance of hydraulic oil to compression
and is the reciprocal of compressibility. The bulk modulus is a basic thermodynamic
property of hydraulic oil that has a very important influence on work efficiency and
dynamic characteristics of hydraulic systems, especially for the hydraulic systems at
ultra-high pressure or ultra-high temperature. In this study, a bulk modulus
experimental equipment for hydraulic oil was designed and manufactured, two types of
hydraulic oil were selected and its isothermal secant bulk modulus were measured at
pressures to 140MPa and temperatures of 20~180°C. Compared the experimental
results with the calculated results from the prediction equations of liquid bulk modulus
that proposed by Klaus, Hayward, and Song, it is found that the experimental results
are not completely identical with the calculated results.