Liquid Atomization and Spray: A Multi-Scale Description

Christophe Dumouchel
2017 Volume 1A, Symposia: Keynotes; Advances in Numerical Modeling for Turbomachinery Flow Optimization; Fluid Machinery; Industrial and Environmental Applications of Fluid Mechanics; Pumping Machinery   unpublished
A multi-scale approach to investigate liquid atomization processes is introduced. It describes the liquid system by the scale distribution whose determination is inspired from the Euclidean Distance Mapping used to measure the fractal dimension of a contour. The scale distribution is introduced in 2D and in 3D and applications from previous investigations are presented. The 2D applications are performed on experimental images and the 3D applications are performed on results obtained from Direct
more » ... btained from Direct Numerical Simulation. The multi-scale analysis allows identifying and quantifying the mechanisms responsible for the interface evolution according to the scale. Among other results, the analyses presented here demonstrate the improvement of the atomization process when an elongation mechanism contributes to the thinning of the small structures. The multi-scale tool also provides new metrics that may be used to validate simulation results. An example of this is presented and discussed. Finally, the paper evokes several approaches to implementing the scale-distribution concept to improve or build new models. 2 Copyright © 2017 by ASME illustrated in Fig. 1 for a 2-D system. Figure 1 -left shows the initial system, which has a 2-D total surface area noted S2T. The system is eroded by circular structuring elements with a diameter d. The eroded system (dark-gray area in Fig. 1-right) has a surface area noted S2(d). The erosion operation is applied for d varying from 0 to infinity and the cumulative surface-based scale distribution E2(d) is constructed as:
doi:10.1115/fedsm2017-69590 fatcat:neucklbpc5ejvn2d45h7q5bqky