In this work we develop an equation for the air core diameter in a hyd
rocyclone in terms of geometrical and operational parameters, based in
a phenomenological equation which we derived previously. Using this e
quation the air core diameter in a 6 inch hydrocyclone was calculated
and from this result the discharge type, spray or roping, could be pre
dicted accurately for the experiments performed by Plitt et al. and by
Bustamante.