Hydrodynamics and structure of dusty plasma fluid

Summary form only given. The dusty plasma is a partly ionized gas that, in the majority of cases, contains negatively charged dust particles of micron size. Micron-sized dust particles in the dusty plasma assume a significant negative charge (/spl sim/10/sup 3/-10/sup 5/e) and may form quasi-stationary plasma-dust structures similar to a liquid or a solid. In contrast to real liquids, the laboratory dusty plasma is a good experimental model for studying the properties of nonideal systems, because, owing to their size, dust particles may be videofilmed, which significantly simplifies the use of direct methods for their diagnostics. Experimental studies of dusty plasma may play an important part in verifying the existing, and developing new, phenomenological models for strongly coupled liquid systems. Such models are of great significance, because, owing to strong interparticle interaction, the theory of liquids lacks a small parameter that could be used for an analytical description of its state and thermodynamic characteristics, as is possible in the case of gases. Results are given of experimental investigation of three-particle correlation for liquid plasma-dust structures formed in the electrode layer of a capacitive RF discharge. The obtained three-particle correlation functions for experimental and numerical data are analyzed and compared with the superposition approximation. The forming of clusters of macroparticles in plasma-dust systems being analyzed is revealed. The viscosity of dusty plasma fluid was studied. The laminar flow of dusty fluid was induced by the action of laser radiation. The radial distribution functions of quasiliquid dusty plasma in RF-discharge have been obtained from videotape recordings of experimental object. With the help of special procedure the parameters of Debye potential between dust particles have been estimated. The calculations of radial distribution functions of dusty plasma with Debye potential with these parameters have b- en made using hypernetted chain integral equation. The results are in a good agreement with experiment at low coupling parameters. The agreement becomes worse while the coupling parameter increases.