EXPERIMENTAL CHARACTERIZATION OF INDUSTRIAL TWIN-FLUID ATOMIZERS

Abstract

The aim of this work is focused on the characterization of the behavior of large-capacity multihole
\nindustrial twin-fluid atomizers. Sauter mean diameter (SMD), discharge coefficient, and air-toliquid
\nmass flow rate ratio are the parameters that have been selected for the experimental study. Two
\nkinds of nozzles have been tested: a commercial “Y” type and a new-concept twin-fluid nozzle with
\nan internal swirl chamber. This new-concept nozzle, which is specifically designed to atomize crude
\npetroleum in power plants, is made with two different pieces, which eases cleaning and maintenance
\ntasks. The best performance has been obtained for the new-concept nozzle without Y ports in the
\ninternal part, yielding smaller droplets with a lower air mass flow rate. A nondimensional relationship
\nbetween the SMD-to-air core diameter at the exit holes (Dao ) versus the air Reynolds number defined
\nwith Dao has been found. This nondimensional relation reproduces very well the experimental
\nmeasurements for the whole range of atomizing conditions, which includes the actual power plant
\noperating conditions.