Understanding and characterizing the performance of a cyclone requires knowledge of the gas flow patterns within. The overall gas motion consists of two vortices: an outer vortex moving down and an inner vortex moving up.
According to Barth (1956), the boundary between the outer and inner vortices, called the cyclone core, is the cylindrical extension of the gas exit duct.
Gas flow is three dimensional and can be described in terms of three velocity components—tangential, radial, and axial. Ter Linden (1949) made the first systematic measurements of the velocity field inside a cyclone. In recent years, laser doppler velocimetry (Kirch and Loffler 1987) and digital imaging (Kessler and Leith 1991) have yielded more accurate measurements of the three velocity components.
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