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Computer has developed rapidly and used to calculate complicated fluid flow phenomena even to climate, airplane, environment, etc. Computational Fluid Dynamics(CFD) made it possible to research the experiments in science and engineering fields which can not be performed due to their expense, danger, or time. Recently it is prospected to accelerate the proliferation of CFD to various fields. In this study, Fluent code as a commercial code of CFD is used to scrutinize the fluid flow phenomena in a simple cyclone, a representative dust collector. A tangential entry cyclone in a standard size was gridded in 2D and 3D and calculated to iteration no. over 2800 by k-ε turbulence model in the conditions of = 1.2 (10℃) =1.76 10^-5 kg/m·sec (10℃), inlet = 1, U velocity = 24.384m/sec, turbulence intensity = 5%, and characteristic length = 80×10^-5kg/m·sec, in boundary conditions U velocity = 7.1m/sec, turbulence intensity = 5%, and characteristic length = 80×10^-3kg/m·sec. The results of this study were as follows: Mass flux in the cyclone was large in the near upper area between the outside cylinder and the inside cylinder under inlet, and getting smaller downward along the cone and upward to outlet in the middle of the cylinder. In the pressure distribution the pressure was highest at the upper and outer area between the outside cylinder and the inside. cylinder, the opposit side of the inlet, and getting lower downward along the inner wall of the cone and the outside cylinder and negative upward along the middle from the dust exit to outlet area.
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