The feed and overflow rates of the hydrocyclone illustrated are 36 and 23 litres per minute, the liquid viscosity is 0.0015 pa s, the solid and liquid densities are 2000 and 1000 kg m, respectively. These questions determine the separation size for the hydrocyclone using equilibrium orbit theory. i). If Ro is the internal radius of the hydrocyclone, the fractional volume inside the locus of zero vertical velocity is: b: (R/R) C: TR d: IR/IR 3 a: (R/R)