Premium
CFD as an approach to understand flammable dust 20 L standard test: Effect of the ignition time on the fluid flow
Author(s) -
Vizcaya Daniel,
Pinilla Andrés,
Amín Mariangel,
Ratkovich Nicolás,
Munoz Felipe,
Murillo Carlos,
BardinMonnier Nathalie,
Dufaud Olivier
Publication year - 2018
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15883
Subject(s) - flammable liquid , ignition system , turbulence , mechanics , dust explosion , nozzle , particle image velocimetry , large eddy simulation , flow (mathematics) , computational fluid dynamics , particle (ecology) , meteorology , physics , engineering , thermodynamics , geology , oceanography
A computational study based on the Euler–Lagrange approach was developed for the characterization of flammable dusts in the 20 L sphere standard test. The aim of the study was to analyze some parameters that might affect the experimental data (e.g., cold turbulence and particle size). The turbulence of a wheat starch cloud was described with the Detached Eddy Simulation model. Both the pressure of the system and the RMS velocity were compared with the flow patterns established with a particle image velocimetry analysis. It was concluded that the rebound nozzle forms a cloud that is composed by clumps. This fact implies dissimilarities between the local concentrations and the nominal value. Finally, a granulometric analysis established that the mean diameter of the particle size distribution (PSD) decreased by 69% during the dispersion. Thus, it is suggested to consider the PSD at the ignition zone rather than the PSD of the sample. © 2017 American Institute of Chemical Engineers AIChE J , 63: 42–54, 2018