The Utilization of Specially Tailored Air Bubbles as Static Pressure Sensors in a Jet

Creators: Ooi, K. K.; Acosta, A. J.

Abstract

It is shown that air bubbles of a certain size may be used to measure the fluctuating pressure in a liquid jet. The conditions under which these bubbles accurately reflect the local static pressures are described in detail; the volume shape of the bubbles was determined by holography for a 3.17mm jet and the change in volume is interpreted as a result of the fluctuating pressure. The experimental results revealed that at any one instant, a wide spectrum of static pressure fluctuation intensities exist in the jet. It was also found that the probability distribution of these intensities has a slightly skewed bell shape distribution and that the fluctuating static pressure peaked at a higher positive value than a negative one.

Additional Information

Contributed by the Fluids Engineering Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS and presnted at the Fluids Engineering Conference, Houston, Texas, June 20-22, 1983. Manuscript received by the Fluids Engineering Division, August 24, 1983. Paper No. 83-FE-34. The authors would like to take this opportunity to thank Professor Sabersky and Dr. Oldenziel for providing many useful suggestions and comments. Dr. J. Katz is deserving of special mention for his valuable assistance on the holographic work. The authors are grateful to Susan Berkley for her help in organizing the manuscript. This work was supported by Naval Sea System Command General Hydromechanics Research Program administered by the David Taylor Naval Research and Development Center under Contract No. N00014-75-C-0378, which was greatly appreciated.

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