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This research was focused in two parts, experimental results and regression model. First, the research was studied on the proportion of cylindrical length that affected to the separation efficiency using a 40 mm hydrocyclone. The effects of cylindrical lengths of 60, 80 and 100 mm were investigated. The tested suspension was the mixed of silica and water. The silica particles have an average size of 9-10 micrometer at the solid concentration of 0.5% w/v. The feed flow rate of 1 m3/hr was operated with the flow ratio of 0.1. From experimental result, it was found that the shorter cylindrical length, the higher separation efficiency. At the condition of the cylindrical length of 60 mm, the vortex finder length of 40 mm and the conical length of 200 mm revealed the best separation efficiency up to 84.06 percent. Second, regression model of Euler number of hydrocyclone was presented. In this work, data obtained from the experiments in the first part and data of earlier researches totally of 75 were used to make the relationship between the proportion of hydrocyclone and Euler number. By the multiple linear regression method, it was found that the constants, was 3,439 and the regression coefficient of n2, n3, n4 and n5 were 0.380, 0.486, 0.222 and 0.039, respectively.
Keywords: Cylindrical length, Regression model, Euler number, Hydrocyclone
