A Study on Combustion Behavior of Ethanol Two Droplets in DC Electric Field under Microgravity

Int. J. Microgravity Sci. Appl. 2007p246
Author
O. IMAMURA, K. YAMASHITA, J. OSAKA, M. TSUE and M. KONO
Organization
The University of Tokyo, Nagoya University, 
Abstract
Combustion experiments of two droplets combustion were carried out in the DC electric field under microgravity. Two ethanol droplets are arrayed in the direction of electric field between two plate electrodes. As a result, flame deformations of anode-side flame and cathode-side flame are different from each other, but increases in burning rate constants are comparable level for two flames. This indicates different mechanism of effect of electric field for each flame. The convective effect is considered to be the main reason for cathode-side flame, on the other hand electron injection from the cathode-side flame is considered as the reason for anode-side flame. In order to discuss this phenomenon, droplets combustion in non-uniform electric field was also performed using a needle and a plate electrode, because electron emission will be expected when the needle electrode is negative. As a result, effects of electric field on flame deformations depend on polarity of electrode, however, effects on burning rate constant is comparable level in spite of polarity. From this experimental result, effect of electron injection is expected to appear as effect of local flow through negative ions. This effect of electron can be applied to anode-side flame in two droplets combustion and observed combustion behavior can be explained qualitatively.
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