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

• Published in: International journal of heat and fluid flow Vol. 20; no. 5; pp. 462 - 469
• Main Authors: Samenfink, W., Elsäßer, A., Dullenkopf, K., Wittig, S.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY Elsevier Inc 01.10.1999; Elsevier Science
• Subjects: Drops and bubbles; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Nonhomogeneous flows; Physics; Concentration measurement; Test facilities; Laser Doppler anemometers; Droplets; Interactions; Atomization; Liquid layer; Experimental study; Deposition
• ISSN: 0142-727X; 1879-2278
• DOI: 10.1016/S0142-727X(99)00035-1

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.