. Analysis of test data on the performance characteristics of planning and displacement floats for supporting submerged loads. Towing; Pontoons. 27 A HYPOTHESIS FOR THE STRIATION PHENOMENON It Is interesting to observe that the flow over the float while it is still submerged and is being towed in a "cavity" formed in the water, ex- hibits the same type of striations near the points of separation, Figure 21a, as is shown by a sphere or projectile dropped through a free surface. A photograph of a sphere dropped into the transparent-wall tank at the Taylor Model Basin exhibits these str
. Analysis of test data on the performance characteristics of planning and displacement floats for supporting submerged loads. Towing; Pontoons. 27 A HYPOTHESIS FOR THE STRIATION PHENOMENON It Is interesting to observe that the flow over the float while it is still submerged and is being towed in a "cavity" formed in the water, ex- hibits the same type of striations near the points of separation, Figure 21a, as is shown by a sphere or projectile dropped through a free surface. A photograph of a sphere dropped into the transparent-wall tank at the Taylor Model Basin exhibits these striations clearly, as is shown in Figure 25. Similar striations also appeared during the tests of the balsa-wood displace- ment float; see Figure Figure 25 - Photograph of Aluminum Sphere Dropped into the Transparent-Wall Tank at the Taylor Model Basin The entraince velocity was approximately 29 feet per second. It has been suggested that the striations on a sphere dropped into water are the result of the formation of cavities about minute nuclei on or near the surface of the sphere. However, the very even spacing of the stria- tions on the planing float, as well as on the sphere shown in Figure 25, sug- gests that a phenomenon other than that due simply to a random distribution of nuclei is more likely to be the cause of the configuration. Although the ~ condition of the surface of the experimental specimen is undoubtedly an im- portant variable in the flow configuration, as evidenced by many sphere drops. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Eisenberg, Phillip; David W. Taylor Model Basin. Washington, D. C. : Dept. of the Navy, David Taylor Model Basin
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