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Bubbles or foam in working oils greatly influence the performance of fluid power systems and may cause major problems. Recently, one of the authors has developed a new device using swirl flow for bubble elimination capable of eliminating bubbles and of decreasing dissolved gases. In this paper, performance of the bubble elimination device is demonstrated by reducing rate of bubble content and of dissolved air in oils. The developed bubble elimination device can solve the problem concerning the air entrainment in fluid power systems.

Bubbles in working fluids have much influence on the performance of fluid power systems. One of the authors has developed a novel device for bubble elimination capable of eliminating bubbles and decreasing dissolved gases using swirl flow. In this paper, performance of bubble removal in oil flow is studied through numerical analysis of the swirl flow in the device. This paper also documents a reduction of oil temperature rise and removal of entrained air from the working fluid in the hydraulic circuit by use of the device. It has been confirmed that the device is effective keeping the oil temperature low in the fluid power system.