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

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