Institute of Problems of Mechanical Engineering RAS (Russia); REC «Mekhanobr-Tekhnika» (Russia):

Blekhman L. I., Leading Researcher, Ph. D. in Technical Sciences, liblekhman@yandex.ru

Under consideration is a solid body vibrating in liquid adjacent to a impermeable wall perpendicularly to its plane. It is shown that in this case arises a peculiar buoyancy force directed in perpendicular to the wall and rapidly increasing with approach of the body to the wall. The weighing force expressions have been derived for flat, concave and convex in direction toward the wall bodies of revolution. This provided possibility to arrive to the inference on weighing vibrating bodies more dense than the liquid and to define the height of weighing.The results obtained have been correlated to the regularities of two pulsing or vibrating bodies interaction first investigated by C. Bjerknes and corroborated by many other researchers. As demonstrated by experiments and natural observations, the weighing arises also when the vibrating body is placed into a loose medium so that the body rises to the surface in spite of its being more dense than the loose medium. The physical mechanism of this phenomenon, which is a manifestation of the segregation effect , is studied. In conclusion the general problem on behavior of vibrating bodies in the vicinity of two media interface is formulated. The results of the study may be used in the theory of suspension bearing turbulent flows highly applicable in the theory of vibrating pumps, then for explanation and estimation of pipe buckling near the sea bottom and finally for explaining the paradoxical unsinkability of concretions and strange expulsion of boulders to the ground surface.

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