抄録
The following results were obtained.
1) Pressure drop of a designed cyclone was about 4-fold to inlet velocity head, for details, it was given by the function of μ/ρ of fluids.
2) In this case, it proves that Ikemoris theoritical formula is applied for the minimum size of separated solid particles.
3) In a certain condition of the over flow pipe, it proves to form the core of a by the spiral current through the over flow pipe.
