Title of article :
Optical fibre probe measurements of bubbly flow in hydraulic jumps
Author/Authors :
Murzyn، نويسنده , , F. and Mouaze، نويسنده , , D. and Chaplin، نويسنده , , J.R.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
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.
Keywords :
Two-phase flow , Hydraulic jump , Void fraction , Bubble frequency , Sauter mean diameter , Optical fibre probe , Dual-tip probe
Journal title :
International Journal of Multiphase Flow
Journal title :
International Journal of Multiphase Flow