THE HYDROGEN-BUBBLE, FLOW-VISUALIZATION TECHNIQUE.
DAVID TAYLOR MODEL BASIN WASHINGTON D C HYDROMECHANICS LAB
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The hydrogen-bubble visualization technique was adapted to a 12-inch variable-pressure water tunnel. An outline of this adaption and the operation of the technique are described. Photographic techniques and analyses applied to the resulting films are discussed. Sources of error are delineated, particularly with regard to the deceptive streakline patterns that can be formed and especially the results of exceeding the velocity limitation imposed by the shedding phenomena taking place behind the platinum wires. Errors caused by compression andor stretching of bubble lines along their length are discussed, and procedures are given for recognizing this type of error. In additon, cathode -wire configurations are described by which both longitudinal and transverse velocity profiles can be obtained in steady or unsteady water flows. Various cathode-wire configurations are described through which qualitative aspects of the flow about bodies as stagnation and separation point motions are depicted. Author
- Test Facilities, Equipment and Methods
- Fluid Mechanics