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- W2030449214 abstract "The significance of Marangoni convection on the inter-droplet flame propagation in spray has not been properly established. In a microgravity experiment on flame spread along a linear n-decane droplet array placed in air at room temperature at high pressures, it was found that as the diffusion flame of burning droplets approaches the next unburned droplet, evaporated fuel gas is ejected from the opposite side of the droplet and strong combustion takes places in this jet region. This results in an increased inter-droplet flame propagation speed at pressures near the critical pressure of n-decane. In this work, numerical simulations and theoretical analyses were conducted to characterize the Marangoni effect on a droplet approached by a diffusion flame. It is found that two regimes with different Marangoni number dependence of the maximum droplet surface velocity emerge, depending on whether the maximum surface velocity exceeds the thermal wave velocity of the approaching flame. It is shown that Marangoni convection plays a dominant role in inter-droplet flame propagation only for droplets larger than the critical droplet size determined from an analytical expression for a transition Marangoni number, and that the effect of Marangoni convection maximizes at a certain pressure near the critical pressure of the fuel. It is also argued that the inter-droplet flame propagation mode map developed for the atmospheric pressure case can be applied for high pressures by accounting for the way in which the maximum flame diameter of an isolated droplet and the latent heat of evaporation are dependent on pressure." @default.
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- W2030449214 date "2006-02-01" @default.
- W2030449214 modified "2023-09-26" @default.
- W2030449214 title "Marangoni effect on a droplet approached by a diffusion flame" @default.
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- W2030449214 doi "https://doi.org/10.1080/13647830500307634" @default.
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