Abstract
When several candles are bundled together, the size of the combined candle flame oscillates. We carried out observational experiments to understand the mechanism of this oscillation. These were optical imaging, shadow graph imaging, temperature imaging around the oscillating candle flame, and image analysis to obtain the quantitative velocity distribution of the air flow above the candle flame. The experiments detected the descending air flow to the candle flame from the upper area, and showed that the descending air flow is involved with the candle flame oscillation. According to the results, we propose a new mechanism of the candle flame oscillation using the analogy of the cumulonimbus cloud in meteorology.
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