Abstract
The author describes experiments for the treatment of water with helium, argon and nitrogen at pressures of 1 to 80 atm abs. The greater kinetic energy possessed by gases at elevated pressures causes considerable deformation of the bubbles and more rapid disintegration of the gas stream into bubbles than in gassing at normal pressure. Striking discontinuities are observed, viz., a sudden rise in bubble frequency occurs at increased gas rates. Photographs show the bubble shapes and bubble ascent in various ranges of pressure, varying between introduction of the gas as single bubbles and as a coherent stream at high rates of throughput.
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