Operating Principle of the Bubble Eliminator

1Generation of Swirling (Cyclone) Flow

•Liquid containing bubbles enters the tapered tube through tangentially arranged inlet ports.
•This side-entry injection produces a strong cyclone flow, accelerating the liquid helically along the inner wall of the taper.

2Pressure Drop along the Central Axis

•Centrifugal force pushes the liquid toward the outer wall, so the static pressure near the central axis falls sharply (Bernoulli effect).
•The lowest pressure appears near the downstream end of the tapered tube; after the flow enters the straight tube, viscous drag slows the swirl and the pressure gradually recovers.

3Capture and Coalescence of Bubbles

•Fine bubbles, having lower density, migrate toward the low-pressure core, where they aggregate into a large bubble column.
•Lower viscosity strengthens the swirl, causing faster and greater bubble concentration at the center and improving removal efficiency.

4Discharge (Vent) of Bubbles

•Applying back-pressure downstream of the tapered tube, or momentarily closing the on–off valve of the vent port, forces the central bubble column outward and expels it through the vent line.

5Resulting Effects

•Continuous bubble removal and dissolved-gas reduction suppress cavitation, bulk-modulus changes, lubrication degradation, noise, and temperature rise in hydraulic, lubricating, and food-processing fluid systems.
•Numerical simulations and high-speed visualization experiments quantitatively confirm bubble concentration at the tapered-tube outlet and the resulting removal performance.

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