Comparison of the Eulerian and Lagrangian Approaches in Studying the Flow Pattern and Heat Transfer in a Separated Axisymmetric Turbulent Gas–Droplet Flow
M. A. Pakhomov, V. I. Terekhov
Keywords: Eulerian and Lagrangian approaches, separated gas–droplet flow, turbulence, dispersion and evaporation of droplets
Abstract
The Eulerian and Lagrangian approaches are used to perform a numerical study of the disperse phase dynamics, turbulence, and heat transfer in a turbulent gas–droplet flow in a tube with sudden expansion with the following ranges of twophase flow parameters: initial droplet size d_{1} = 0–200 μm and mass fraction of droplets M_{L1} = 0–0.1. The main difference between the Eulerian and Lagrangian approaches is the difference in the predictions of the droplet mass fraction: the Eulerian approach predicts a smaller value of M_{L} both in the recirculation region and in the flow core (the difference reaches 15–20%). It is demonstrated that the disperse phase mass fraction calculated by the Lagrangian approach agrees better with measured data than the corresponding value predicted by the Eulerian approach.
