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Inverse Influence of Initial Diameter on Droplet Burning Rate in Cold and Hot Ambiences: a Thermal Action of Flame in Balance with Heat Loss by Guangwen Xu; Masiki Ikegami; Senji Honma; Kouji Ikeda; Xiaoxun Ma; Hiroshi Nagaishi; Daniel L. Dietrich; Peter M. Struk is a Engineering article available to read on EtoBox.

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Isolated droplet burning were conducted in microgravity ambiences of different temperatures to test the initial diameter influence on droplet burning rate that shows a flame scale effect and represents an overall thermal action of flame in balance with heat loss. The coldest ambience examined was room air, which utilized a heater wire to ignite the droplet. All other ambiences hotter than 633 K were acquired through an electrically heated air chamber in a stainless steel can. An inverse influence of initial droplet diameter on burning rate was demonstrated for the cold and hot ambiences. That is, the burning rate respectively decreased and increased in the former and latter cases with raising the initial droplet diameter. The reversion between the two influences appeared gradual. In the hot ambiences the burning rate increase with increasing the initial droplet diameter was larger at higher temperatures. A ''net heat'' of flame that denotes the difference between ''heat gain'' by the droplet and ''heat loss'' to the flame surrounding was suggested responsible for the results. In low-temperature ambiences there is a negative net heat, and it turns gradually positive as the ambience

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Author

Guangwen Xu; Masiki Ikegami; Senji Honma; Kouji Ikeda; Xiaoxun Ma; Hiroshi Nagaishi; Daniel L. Dietrich; Peter M. Struk

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0017-9310)

Published

2003

Language

EN

Field

Engineering (Physical Sciences)