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Article Dans Une Revue Combustion and Flame Année : 2024

Effect of flame characteristics on an isolated ethanol droplet evaporating through stagnation methane/air flames: An experimental and numerical study

Résumé

A single ethanol droplet evaporation through laminar methane/air stagnation flame is investigated at lean, stoichiometric and rich conditions experimentally and numerically. For the droplets having initial diameters of 20-70 μm, the particle Reynolds number is measured via PIV/PTV, resulting in the slip velocity between the droplet and gas flow being small and the surrounding gas being able to carry without any significant convective effects. Evaporation rates, computed from Abramzon–Sirignano for a moving droplet towards a stagnation flame field, satisfy the ones computed from empirically determined evaporation rates from ILIDS measurements as a function of flame temperature, flame speed and flame thickness. Nevertheless, Abramzon–Sirignano model slightly overestimates the vaporization constant for lean cases. The distance traveled by the droplet after leaving the flame zone determines the average critical diameter. Accordingly, droplets larger than 18 μm can cross the flame, leading to local modifications in the flame region due to heat loss and vapor diffusion from the droplet.
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vendredi 25 octobre 2024
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vendredi 25 octobre 2024
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Dates et versions

hal-04560009 , version 1 (02-05-2024)

Identifiants

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Deniz Kaya Eyice, Mehmet Karaca, Fabien Halter, İskender Gökalp, Christian Chauveau. Effect of flame characteristics on an isolated ethanol droplet evaporating through stagnation methane/air flames: An experimental and numerical study. Combustion and Flame, 2024, 265, pp.113465. ⟨10.1016/j.combustflame.2024.113465⟩. ⟨hal-04560009⟩
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