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Autoignition and early flame behavior of a spherical cluster of 49 monodispersed droplets
- Source :
- Proceedings of the Combustion Institute. 31:2149-2156
- Publication Year :
- 2007
- Publisher :
- Elsevier BV, 2007.
-
Abstract
- Autoignition and early flame behavior of a spherical cluster of 49 monodispersed droplets in a high-temperature air were examined in microgravity. The monodispersed suspended-droplet cluster (MSDC) model with which both droplet spacing and initial droplet diameter were well-controlled was developed, and the solidified-fuel fiber-suspension technique was utilized for making the MSDC model. The tested 3D MSDC models had the HCP (hexagonal closest packing) structure. Individual flames, which enveloped each droplet, or group flame, which enveloped the whole droplet cluster, were formed immediately after ignition. The flame changed from the group flame to a cluster of the individual flames either with increasing the droplet spacing or decreasing the initial droplet diameter. Each of the individual flames merged into the group flame with the lapse of time. Burning sphere diameter decreased at the beginning, and then increased. The transition from the individual flames to the group flame occurred around the time period at which the burning sphere diameter reached its minimum. The time period at which the burning sphere diameter reached its maximum was delayed and the expansion rate of the burning sphere was enhanced with decreasing the droplet spacing or with increasing the initial droplet diameter.
- Subjects :
- Expansion rate
Chemistry
Hexagonal crystal system
Mechanical Engineering
General Chemical Engineering
technology, industry, and agriculture
Autoignition temperature
Nanotechnology
Molecular physics
eye diseases
humanities
law.invention
Ignition system
fluids and secretions
law
Cluster (physics)
Physical and Theoretical Chemistry
reproductive and urinary physiology
Subjects
Details
- ISSN :
- 15407489
- Volume :
- 31
- Database :
- OpenAIRE
- Journal :
- Proceedings of the Combustion Institute
- Accession number :
- edsair.doi...........cca3d59106b8f9ffde60a1f2eabb6461
- Full Text :
- https://doi.org/10.1016/j.proci.2006.07.124