Abstract
Birchoff and Cagwood1 have described a method for the measurement of velocity distributions in liquids using a sheet of equally spaced rising air bubbles. These are photographed against a dark background, with flash-tube illumination, using the light scattered from the air bubbles; two exposures are recorded on the same plate from two flashes at a known interval apart. Relf2 has used oil drops dispersed in water, illuminated by an arc lamp, to measure fluid velocity. The drops appear as bright points, and thus a time exposure enables the fluid velocity to be found.
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References
Birchoff, G., and Cagwood, J. E., J. App. Phys., 20, 646 (1949).
Relf, E. F., Advis. Comm. Aero., Reports and Memoranda No. 76 (1913).
Goldstein, S., “Modern Developments in Fluid Dynamics”, 1, 304 (Oxf. Univ. Press, 1938).
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CAFFYN, J., UNDERWOOD, R. An Improved Method for the Measurement of the Velocity Profiles in Liquids. Nature 169, 239–240 (1952). https://doi.org/10.1038/169239a0
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DOI: https://doi.org/10.1038/169239a0
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