Gong, Yifei;
Ma, Xiao;
Luo, Kai Hong;
Xu, Hongming;
Shuai, Shijin;
(2022)
A molecular dynamics study of evaporation mode transition of hydrocarbon fuels under supercritical conditions.
Combustion and Flame
, 246
, Article 112397. 10.1016/j.combustflame.2022.112397.
(In press).
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Abstract
The mode transition of evaporation for single- and multi-component hydrocarbon fuels is investigated at the molecular level. This study scrutinizes first the subcritical and supercritical evaporation of nhexadecane droplets and liquid films by molecular dynamics (MD) simulations. The mode regime map of n-hexadecane droplets is obtained. Then the mode transition of evaporation of a three-component droplet and a six-component droplet is studied. A critical dimensionless number τ 0.9P of 0.5 based on the average displacement increment (ADI) of fuel atoms is used to identify the evaporation mode transition of fuels with any type and number of components. It is found that in the diffusion mode of evaporation, the entropy becomes the dominant factor in the evaporation of fuels, and the disorder of the fuel molecules increases significantly compared with that in the classic evaporation mode. Compared with the case of the quiescent droplet, with increasing relative velocity between the droplet and the ambient gas, the mode transition becomes easier, although this is a non-linear process. Fuel droplets and liquid films with different initial sizes are investigated to understand the size effect. In addition, for the same ambient temperature and pressure, the smaller the normalized specific heat transfer surface area of the fuel is, the easier the mode transition of evaporation is. A correlation was proposed to compare the possibility of mode transition of evaporation for single- and multi-component fuels.
| Type: | Article |
|---|---|
| Title: | A molecular dynamics study of evaporation mode transition of hydrocarbon fuels under supercritical conditions |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.combustflame.2022.112397 |
| Publisher version: | https://doi.org/10.1016/j.combustflame.2022.112397 |
| Language: | English |
| Additional information: | © 2022 Published by Elsevier Ltd. This is an open access article under the CC BY 4.0 license Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/) |
| Keywords: | Hydrocarbon fuels, Supercritical conditions, Mode transition of evaporation, Molecular dynamics, Size effect, Relative velocity effect |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10157384 |
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