Abstract
Atomization of multi-component solution droplets in combustion is usually controlled by bubble dynamics such as bubble growth and breakup. In this communication, a novel bubble shrinkage phenomenon was observed in n-butanol/polyoxymethylene dimethyl ether 4 (PODE4) binary droplet combustion, which leads to the weak micro-explosion in the atomization of droplet rather than the strong micro-explosion caused by monotonic bubble growth. A simple evaporation and content evolution model for the liquid film of the bubble is proposed to explain the observed bubble shrinkage phenomenon. Vapor condensation on the interface between the bubble and the liquid film caused by the vapor-liquid nonequilibrium is proposed to induce the bubble shrinkage, and a relatively small bubble growth velocity is found to be associated with the nonequilibrium.
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