Droplet interaction with shear-driven liquid films: analysis of depositionand secondary droplet characteristics

The paper describes the results of a detailed investigation of droplet inte raction with shear-driven liquid films. particularly the mechanism of dropl et splashing and the characteristics of the deposited mass fraction had bee n studied experimentally. A new integral method based on conductivity and v olume flux measurements was used. The deposited mass fraction and the compo sition ratio of the secondary droplets are given as a function of the impac t angle and the film height. Comprehensive measurements of the primary and secondary droplets had been performed by means of a Phase-Doppler-Anemomete r (PDA). The resulting distributions for droplet diameter, velocity and ang le had been used to evaluate correlations for the interaction between singl e droplets and a shear-driven wall film. Together with the results on dropl et deposition they can serve as basis for a complete 2D model simulation in CFD codes. (C) 1999 Elsevier Science Inc. All rights reserved.