Eulerian Multiphase Population Balance Model of Atomizing, Swirling Flows

Abstract

An Eulerian/Eulerian multiphase flow model coupled with a population balance model is used as the basis for numerical simulation of atomization in swirling flows. The objective of this exercise is to develop a methodology capable of predicting the local point-wise drop size distribution in a spray, such as would be measured by the Phase Doppler Particle Analyzer (PDA). Model predictions are compared to experimental measurements of particle size distributions in an airblast atomizer spray to demonstrate good qualitative and quantitative agreement. It is observed that the dependence of velocity on drop size inherent in a multiphase description of the drop cloud appears necessary to capture some features of the experimental data. Using this model, we demonstrate the relative contributions of secondary atomization and transport to the variation observed in the downstream spray drop size distribution.

Analysis and classification of droplet characteristics from atomizers using multifractal analysis

“…34 , and the data from the ABA was taken from Rayapati et al . 35 The droplet characteristics include the diameters, axial velocities and the inter-arrival times.…”

Trends in Multiphase Modeling and Simulation of Sprays

“…However, these methods are computationally not tractable on real systems. For example, a typical implementation of the inhomogenous MUSIG model requires about 3 to 4 weeks run time per simulation on a typical 3GHz workstation [95]. Industrially relevant configurations are even more challenging.…”

“…Specialized kernels are therefore required for spray PBE applications. Application of PBE to sprays is in its infancy [95] and requires more attention before confidence can be gained in the kernel functions being proposed.…”

“…A transport equation is associated with each of these size classes, and the interaction of each size class with the gas phase, as well as the interaction between size classes needs to be modeled [46,48,63,61]. The Eulerian sectional approach can capture some aspects of the size-velocity correlation [95]. Eulerian approaches based on quadrature-based moment methods (QBMM) can capture size-velocity correlations well.…”

Spatio-temporal microstructure of sprays: data science-based analysis and modelling

“…The air-blast spray data were obtained from a swirling axisymmetric free jet spraying calibration fluid MIL-PRF-7024 type 2. Details of the experimental set-up and atomizer configuration are available in Rayapati et al (2011). The pressure swirl spray data were obtained using water as a working fluid and have been reported by Dhivyaraja et al (2019).…”