Between Dec 19, 2024 and Jan 2, 2025, datasets can be submitted to DRUM but will not be processed until after the break. Staff will not be available to answer email during this period, and will not be able to provide DOIs until after Jan 2. If you are in need of a DOI during this period, consider Dryad or OpenICPSR. Submission responses to the UDC may also be delayed during this time.

Browsing by Author "Tsai, F. Y."

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Experimental Investigation of Taylor Instability Using Non-Newtonian Fluids
    (St. Anthony Falls Laboratory, 1966-06) Song, C. S.; Tsai, F. Y.
    The critical Taylor numbers for five different non-Newtonian solutions were determined experimentally by visual observation using the hydrogen bubble technique. Although three different gap sizes were used, only the data for the smallest size can be considered satisfactorily accurate. Smaller hydrogen bubbles than those used in this experiment are necessary for more aocurate determination. Contrary to a finding by others, the present experiment indicates that the critical Taylor number is decreased as the concentration is increased. The shear on the outer cylinder due to rotation of the inner cylinder was also measured for an intermediate range of Reynolds number, i.e. laminar flow at superoritical Taylor number. Substantial reductions of frictional drag coefficient Were achieved at higher additive concentrations When the comparison was based on equal Reynolds number.
  • Thumbnail Image
    Item
    Unsteady, Symmetrical, supercavitating Flows Past a Thin Wedge in a Solid Wall Channel
    (St. Anthony Falls Hydraulic Laboratory, 1962-06) Song, C. S.; Tsai, F. Y.
    Problems of symmetrical two-dimensional supercavitating flow about a thin wedge in a finite fluid with two parallel solid boundaries are solved by means of a linearized method utilizing the complex acceleration potential. The solution contains no singularity and, as a result, pressure is finite everywhere. It is shown that the term indicating the effect of cavity pressure change on the drag which existed in the case of the flows with free boundaries is identical to zero when the boundaries are solid. It is also concluded that, in steady flow cases, the accuracy of the solutions using the linearized method is comparable to that using the linearized velocity potential method. In fact, the two methods give identical solutions cavities are infinitely long.