Particleladen swirling free jets  Measurements and predictions
Abstract
A theoretical and experimental investigation of singlephase and particleladen weakly swirling jets was conducted. The jets were injected vertically downward from a 19 mm diameter tube with swirl numbers ranging from 0 to 0.33. The particleladen jets had a single loading ratio (0.2) with particles having an SMD of 39 micrometers. Mean and fluctuating properties of both phases were measured using nonintrusive laser based methods while particle mass flux was measured using an isokinetic sampling probe. The continuous phase was analyzed using both a baseline kepsilon turbulence model and an extended version with modifications based on the flux Richardson number to account for effects of streamline curvature. To highlight effects of interphase transport rates and particle/turbulence interactions, effects of the particles were analyzed as follows: (1) locally homogeneous flow (LHF) analysis, where interphase transport rates are assumed to be infinitely fast; (2) deterministic separated flow (DSF) analysis, where finite interphase transport rates are considered but particle/turbulence interactions are ignored; and (3) stochastic separated flow (SSF) analysis, where both effects are considered using randomwalk computations.
 Publication:

25th AIAA Aerospace Sciences Meeting
 Pub Date:
 January 1987
 Bibcode:
 1987aiaa.meetRQ...B
 Keywords:

 Free Jets;
 Particle Laden Jets;
 Predictions;
 Swirling;
 KEpsilon Turbulence Model;
 Laser Applications;
 Nondestructive Tests;
 Particle Size Distribution;
 Richardson Number;
 Sampling;
 Separated Flow;
 Stochastic Processes;
 Transport Properties;
 Two Phase Flow;
 Fluid Mechanics and Heat Transfer