Abstract
We present calculation models to predict the drop size depending on the hollow cone nozzle's geometry and the volume flow for atomization of Newtonian fluids. The observations are valid for the field of the aerodynamic wave break-up of a swirling liquid sheet. The calculation methods are based on the knowledge of the flow at the nozzle outlet. Assisted by a flow simulation program it was possible to calculate the detailed and locally discrete flow field inside the nozzle taking into account the arising phase interface. The method allows to determine the film thickness, the velocities and the angle of the film which leaves the nozzle outlet. The calculation methods developed, however, allow to describe the formation of the sheet, the alteration of the sheet thickness in the direction of its spreading as well as to determine the Sauter mean diameter after the break-up of the sheet and the ligament under the influence of the gas phase which is in interaction with the liquid. Following the calculation results extensive experimental investigations varying the geometry and the transport properties of the fluids, in particular the viscosity, were undertaken. Comparing the numeric results with the experimental data and with citations in the literature the success of the investigations becomes evident. Thus a calculation basis for the design of hollow cone nozzles is available which allows to predict the Sauter mean diameter as a function of individual parameters of operation and material.
Published Version
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