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Article Dans Une Revue International Communications in Heat and Mass Transfer Année : 2020

Energy analysis of secondary droplet atomization schemes

Résumé

This paper presents the energy analysis of the secondary atomization of droplets with various componentcompositions. We use the following four schemes together or separately: initial droplets colliding with eachother, interaction with a solid wall, droplet transformation due to the oncoming air flow, and micro-explosivebreakup of a droplet being heated. We consider the kinetic energies of primary (pre-atomization) and secondary(post-atomization) droplets and determine the heat spent on atomization. To show the need to atomize secondarydroplets, we establish the differences between the heat released per unit time during the combustion ofprimary and secondary droplets. We also show that the least energy-consuming scheme is the one involvingdroplets colliding with each other and the most effective one in terms of fine aerosol production is the schemewith the micro-explosive droplet breakup. The latter may increase the liquid surface area more than tenfold. Theresearch findings show that the energy spent on the atomization of fuel droplets is less than 1% of the energyreleased from their combustion. A combination of several atomization schemes becomes more effective withlarger initial liquid droplets and their complex component composition.
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Dates et versions

hal-02894022 , version 1 (08-07-2020)

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D. Antonov, N Schlegel, P.A. Strizhak, Dominique Tarlet, Jérôme Bellettre. Energy analysis of secondary droplet atomization schemes. International Communications in Heat and Mass Transfer, 2020, 116 (104666), ⟨10.1016/j.icheatmasstransfer.2020.104666⟩. ⟨hal-02894022⟩
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