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- W4296848670 abstract "Thermally-induced secondary atomization (TISA) enables enhanced atomization, better mixing and faster evaporation in multi-component sprays. Despite its importance in a number of applications, TISA is not yet well understood. In this work we study numerically the effects of key physical parameters on TISA dynamics, with particular emphasis on breakup. To this end, we simulated a series of cases for suspended droplets in microgravity conditions, varying the number of bubbles near the liquid-gas interface. We performed a total of 800 simulations with different fluid properties investigating a wide hyperspace. In particular, we varied viscosity, surface tension, number and size of bubbles, as well as the droplet size, identifying two main parameters necessary for modelling purposes: the breakup time, τb, and maximum normalized surface area, Sf. Here we defined the breakup time as the time between the beginning of the simulation and the maximum surface area observed. We also calculated the Pearson’s coefficient to estimate the influence of each variable on the parameters of interest, understanding that the size of the largest bubble controlled Sf while the Ohnesorge number strongly influenced τb. We further employed the dataset to formulate simple mathematical correlations for Sf and τb by performing a multi-variable regression. Moreover, we looked into the dynamics of the secondary droplets generated by the process, demonstrating that the velocity and size of the ejected droplets are linked to the size of the bubbles that generate them." @default.
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- W4296848670 date "2022-12-01" @default.
- W4296848670 modified "2023-10-02" @default.
- W4296848670 title "Computationally-derived submodel for thermally-induced secondary atomization" @default.
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- W4296848670 doi "https://doi.org/10.1016/j.ijheatmasstransfer.2022.123448" @default.
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