Find the size of a hydro cyclone for the separation of polyethylene particles (dp = 104 m, Po = 900 kg/m) from butane (ng = 104 Pas, pa = 600 kg/m). The inlet velocity is limited to 3 m/s to limit the pressure drop. (Hint: H = 4D) (2 marks) How many cyclones should be arranged in parallel to handle a stream of 600 kg slurry/s? (2 marks)