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research-article

Modeling and Experimental Studies on the Absorption of Entrained Gas and the Influence on Fluid Compressibility

[+] Author and Article Information
Hao Tian

University of Minnesota, Minneapolis, MN 55455
tianx156@umn.edu

James D. Van de Ven

Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455
vandeven@umn.edu

1Corresponding author.

ASME doi:10.1115/1.4036711 History: Received August 26, 2016; Revised April 05, 2017

Abstract

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 micro gas 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.

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