11. Two scaling laws were used; the Strouhal number was graphed as a function of Reynolds number. 12. This selection of characteristic length can be used to present a distinction between Strouhal number and Reduced Frequency. 13. Strouhal number in comparison with the second version which may be referred to as the " acoustical"14. The acoustical Strouhal number is essentially the "'Helmholtz number "'with the 2 deleted. 15. Close examination of the data in the figure showed a slight negative dependence of Strouhal number on Reynolds number. 16. A semi-empirical equation for the frequency, developed by Curle, when converted to Strouhal number , is 17. The second figure on the right shows results from one study indicating a constant Strouhal number with Reynolds number. 18. The higher frequency Strouhal number is caused by small-scale instabilities from the separation of the shear layer. 19. A somewhat similar parameter is the Strouhal number , in form equal to the reciprocal of the Keulegan Carpenter number. 20. At low Reynolds numbers the Strouhal number rises as inertial effects begin to dominate and then decays slightly at higher numbers.
