Journal article
Shock-induced combustion of aluminum particle clusters investigated with resolved sharp-interface two-dimensional simulations
Physical review fluids, Vol.6(8), 083201
08/2021
DOI: 10.1103/PhysRevFluids.6.083201
Abstract
The vaporization and combustion of clusters of aluminum particles in shocked flows is studied through interface-resolved 2D numerical simulations. These mesoscale simulations elucidate, for the first time, aspects of vaporization and burning in molten aluminum (Al) particle clusters that are markedly different from an isolated burning Al particle. Unsteadiness due to shock-generated baroclinic vorticity (inviscid mechanisms) and interactions between the wakes of molten Al particles (viscous mechanisms) are found to have significant effects; vortical mixing facilitates kinetically limited combustion of the particles located upstream in the cluster. Whereas, for particles located downstream in the cluster, the interaction with the low-speed, oxygen-lean wake of the upstream particles leads to diffusion-limited combustion. Results show that particles in a cluster have lower rates of vaporization and combustion than isolated particles under the same overall flow conditions. To isolate inviscid and viscous effects, the flame structure and vaporization rate for particles in a cluster are quantified in terms of local flow conditions, i.e., the local Mach number, Reynolds number, location of a particle in the cluster, and volume fraction. The results obtained in this study will be useful in understanding and modeling the mesoscale physics of shock-induced burning of explosively dispersed reactive aluminum particles.
Details
- Title: Subtitle
- Shock-induced combustion of aluminum particle clusters investigated with resolved sharp-interface two-dimensional simulations
- Creators
- Pratik Das - University of IowaH S Udaykumar - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Physical review fluids, Vol.6(8), 083201
- DOI
- 10.1103/PhysRevFluids.6.083201
- ISSN
- 2469-990X
- eISSN
- 2469-990X
- Grant note
- DOI: 10.13039/100006602, name: Air Force Research Laboratory, award: FA8651-16-1-0005
- Language
- English
- Date published
- 08/2021
- Academic Unit
- IIHR--Hydroscience and Engineering; Injury Prevention Research Center; Mechanical Engineering
- Record Identifier
- 9984187846702771
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