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In this study, a mini hydro cyclone was designed and manufactured to achieve an inlet flow rate of 2 L/minin the experiment, which was conducted using alumina powder with a specific gravity of 3.97. This hydrocyclone was studied for using in steam and water analysis system (SWAS) of thermal power plant and wasmanufactured by 3D printing. Numerical analysis was performed with Solidworks Flow Simulation, utilizing thereynolds stress method (RSM) of fluid multiphase flow analysis models. Experimental and numerical analysiswere performed under the three conditions of inlet velocity 2.0, 4.0, and 6.0 m/s. The separation efficiency wasover 80% at all inlet velocity conditions. At the inlet velocity 4m/s, the separation efficiency was the best, andit was confirmed that the efficiency was more than 90%.