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.

Issue Section:
Multiphase Flows
Keywords:
Compressible flows, Fluid transients, Gas-liquid, Measurement techniques, Fluid mechanics
Topics:
Absorption, Bubbles, Compression, Fluids, Mass transfer, Pressure, Bulk modulus, Compressibility, Temperature

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