Abstract
A bubble of hydrogen/air mixture is ignited in water by electric spark in the present experiment. The present study has achieved more ideal experimental condition in terms of uniform heat loss than our previous study, owing to newly developed experimental setup. Influence of the effect of heat loss to the gas-liquid interface, which increases with decreasing size of bubble, on the combustion efficiency is investigated. It is shown that the combustion efficiency of hydrogen/air mixture in a bubble with various equivalence ratio (φ=0.4, 0.6, 0.8, 1.0, 2.0) decreases as the mean diameter of bubble decreases. This result shows that the heat loss to the low temperature gas-liquid interface characterizes the combustion in micro bubble.
