Abstract
The fluid dispersion relation of the dust acoustic wave in a plasma, which consists of electrons, an ion flow, and a dust fluid, is investigated. The dispersion relation has a form similar to that of the conventional one of the ion acoustic wave. It can be transformed into a form that includes the energy exchange factor between the ion flow and dust fluid. The dust acoustic wave can be controlled by varying the ion flow velocity. Varying the ion flow velocity is equivalent to varying the energy exchange factor. In the region where the energy exchange factor is negative, the dust acoustic wave does not propagate and the net energy of the dust fluid is expected to be transferred to the ion flow. In contrast, in the regions where the exchange factor is positive, the dust acoustic wave propagates.
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