Abstract
A mathematical model is presented for numerical simulation of the fluid transients in the return line during the decompression operation of any hydraulic system. Particular attention has been paid to clarification of the influence of gas diffusion on the fluid transients because part of the separation cavity consists of a gas-liquid two-phase flow containing a number of minute gas (air) bubbles in such a system. Experiments, using sump oil and deaerated oil as a test fluid, showed that the generation mechanism of the separation cavity and the fluid transients are significantly affected by the gas diffusion. Values calculated from the proposed bubble-diffusion model, which takes into consideration the effects of gas diffusion as well as the amount of gas bubbles released from the liquid flowing out of the valve before column separation occurs, a change of state of gas and the surface tension applied to the gas bubble, agreed well with the measured values over a wide range of tests.
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