Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 14, Issue 20, Pages 7337-7345Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2cp40132k
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Funding
- ESA
- FNRS
- Prodex
- DLR [50WM0638]
- F.R.S.-FNRS, Belgium
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The dynamics of A + B -> C reaction fronts is studied under modulated gravitational acceleration by means of a combination of parabolic flight experiments and numerical simulations. During modulated gravity the front position undergoes periodic modulation with an accelerated front propagation under hyper-gravity together with a slowing down under low gravity. The underlying reason for this is an amplification and a decay, respectively, of the buoyancy-driven double vortex associated with the front propagation under standard gravitational acceleration, as explained by reaction-diffusion-convection simulations of convection around an A + B -> C front. Deeper insights into the correlation between grey-value changes in the experimental shadowgraph images and characteristic changes in the concentration profiles are obtained by a numerical simulation of the imaging process.
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