As the flow speed increases ( Reynolds number, Re ) the frequency slowly climbs ( nearly constant Strouhal number, St ) but then the frequency jumps up abruptly to a higher stage.
42.
The Strouhal number gives the vortex shedding frequency resulting from placing an object in a steady flow, so it describes the flow unsteadiness as a result of an instability of the flow downstream of the object.
43.
The frequencies were Strouhal number scaled with " U " and the sound levels were scaled with the dipole sound power rule of " U " 6 over a speed range of 3 to 1.
44.
If the measurement bandwidth is broad and the measurement distance is out of the near field, there are two dynamic factors ( Strouhal number and dimensionless force ), that can cause the exponent to be less than six.
45.
This dimensionless parameter " St " is known as the Strouhal number and is named after the Czech physicist, Vincenc Strouhal ( 1850 1922 ) who first investigated the steady humming or singing of telegraph wires in 1878.
46.
Although the jet speed " U " can vary, the fluid mechanical Strouhal number is relatively constant and normally operates in Stage I . When there is phase coherent gain of the two aspects, they operate as Class III monopole sources.
47.
It was found that the feedback was Class III and the Strouhal numbers ranging from 0.3 to 0.4 were associated with a single vortex pattern ( Stage I ) across the gap while Strouhal numbers ranging from 0.6 to 0.9 were associated with two vortices across the gap ( Stage II ).
48.
It was found that the feedback was Class III and the Strouhal numbers ranging from 0.3 to 0.4 were associated with a single vortex pattern ( Stage I ) across the gap while Strouhal numbers ranging from 0.6 to 0.9 were associated with two vortices across the gap ( Stage II ).
49.
For this case, the flow speed, in terms of Reynolds number, was graphed against the disturbance frequency, in terms of the Strouhal number for a variety of disturbance amplitudes to reveal the region of instability as shown in the figure on the left . The value of " D " in the figure represents the ratio of the lateral disturbance displacement to the nozzle width; the disturbances were minute.
50.
It is a transcendental equation where " A c " is the cross sectional area of a cylindrical cavity of depth " L " . " A o " is the area of the circular orifice of depth " L o ", " ? e " is the exterior end correction, " ? i " is the interior end correction, and " kL " is the Helmholtz number ( acoustical Strouhal number with 2 added ).
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