Laser anemometry techniques have been employed to measure gas velocities in annular two-phase flow. Mean velocities and Reynold’s stresses in the gas appear to be similar to those in corresponding rough pipes. However, turbulence intensities are higher than the values corresponding to flow over a wall with a roughness equivalent to the film interface.
Detailed Measurements of Vertical Annular Two-Phase Flow—Part II: Gas Core Turbulence
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Azzopardi, B. J., and Teixeira, J. C. F. (December 1, 1994). "Detailed Measurements of Vertical Annular Two-Phase Flow—Part II: Gas Core Turbulence." ASME. J. Fluids Eng. December 1994; 116(4): 796–800. https://doi.org/10.1115/1.2911852
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