The bulk modulus of hydraulic fluid is dependent on the quantity of entrained gas in the fluid. In this paper, an effective fluid bulk modulus model that captures dynamic gas absorption during pressure transients is derived from the overall mass transfer theory. Optical measurement of a microgas bubble volume is used to determine the interfacial mass transport. Compared to traditional models, the proposed model is able to capture the 10% gap in the pressure profile between the first and second cycles, when simulating multiple compression cycles of an oil sample with 0.65% entrained gas by volume at 8 MPa.
Modeling and Experimental Studies on the Absorption of Entrained Gas and the Influence on Fluid Compressibility
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received August 26, 2016; final manuscript received April 5, 2017; published online July 10, 2017. Assoc. Editor: Mark R. Duignan.
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Tian, H., and Van de Ven, J. D. (July 10, 2017). "Modeling and Experimental Studies on the Absorption of Entrained Gas and the Influence on Fluid Compressibility." ASME. J. Fluids Eng. October 2017; 139(10): 101301. https://doi.org/10.1115/1.4036711
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