Abstract
It is necessary to know the conditions in which sound affects an attached water jet and clarify these phenomena for practical application of acoustically controlled fluidic devices in oceanographic developments.
In the present papar, the effects of applied sound on the attachment of water jets to a curved wall are experimentally investigated from the changes of the deflection angle of jets and jet centerline on the basis of the fundamental characteristics of two-dimensional water jets sensitive to sound. In addition, the transient response of the test device with a receiver located in the jets is examined by using sound as a control input in order to discuss the possibility of applying the phenomena of the attached jets to fluidics. And the attachment phenomena of water jets affected by sound are considered from the statistical inference of the response time.
As a result, the following facts are especially confirmed:
1) Three different phenomena of wall attachment of a water jet sensitive to sound are fundamentally recognized. It is especially worth noting among them that an attached jet separates from the wall by sound and changes into a separated jet.
2) The dynamic behaviours of an attached water jet affected by sound are related to the formation of low pressure bubble region, the irregularity of fluctuations in the jets, and the stability of attachment.
