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Optical fibre probe measurements of bubbly flow in hydraulic jumps

Abstract : This paper describes measurements of void fractions, bubble frequencies and bubble sizes in hydraulic jumps with Froude numbers 2.0, 2.4, 3.7 and 4.8. In each case data were obtained with a dual-tip optical fibre probe at a large number of points throughout the jump. Across the lower part of the flow, dominated by air entrainment into a region of turbulent shear, void fractions follow a Gaussian distribution. In the upper region, dominated by interactions with the free surface, the void fraction follows the form of an error function. The intersection between these two profiles provides a well-defined boundary between the two regions. Comparisons are made with measurements at higher Froude numbers [by Chanson, H., Brattberg, T., 2000. Experimental study of the air–water shear flow in a hydraulic jump. International Journal of Multiphase Flow 26, 583–607] revealing a very large measure of compatibility between the two sets of data.
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Submitted on : Wednesday, March 28, 2018 - 1:41:06 PM
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F Murzyn, Dominique Mouazé, J. R. Chaplin. Optical fibre probe measurements of bubbly flow in hydraulic jumps. International Journal of Multiphase Flow, Elsevier, 2005, 31 (1), pp.141--154. ⟨10.1016/j.ijmultiphaseflow.2004.09.004⟩. ⟨hal-01745601⟩



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