Abstract: “This paper proposes two procedures for designing a vortex drop shaft, both of which are based on a recently set up mathematical model. This model is different from previous ones as it considers the possible existence of negative pressure at the drop shaft inlet, thus allowing the incongruence of the previous models to be overcome. This paper presents an analysis of the reliability of the model, within which the calculation parameters have been tested using experimental data from a number of working drop shafts.”

Keywords: drop shaft, vortex flow, mathematical model, experimental tests, hydraulic design.