Journal
ENERGY
Volume 258, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2022.124838
Keywords
Multicomponent mixing system; Fuel droplet evaporation; Supercritical conditions; Transition criterion; Molecular dynamics
Categories
Funding
- Natural Science Foundation of China [51976100]
- UK Engineering and Physical Sciences Research Council under the project UK Consortium on Mesoscale Engineering Sciences (UKCOMES) [EP/R029598/1]
- CoSeC
- Computational Science Center for Research Communities, through UKCOMES
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This study investigates the evaporation of a multicomponent fuel droplet under supercritical conditions using molecular dynamics simulations. The study focuses on the effects of multicomponent ambient gases and the relative motion between the droplet and the ambient. The results show that the transition from evaporation to diffusion mode depends on the temperature, pressure, ambient gases, and relative velocities.
The evaporation of a six-component fuel droplet under supercritical conditions is investigated using molecular dynamics (MD) simulations. The focus here is on effects of multicomponent ambient gases and the relative motion between the droplet and the ambient. The ambient pressure ranges from 8 MPa to 36 MPa and the ambient temperature ranges from 750 K to 3600 K. In the lower range of the temperature and pressure, the average displacement increment (ADI) per fuel atom gradually increases with time and the classic evaporation is observed. In the higher range of the temperature and pressure, the ADI profile has a unimodal distribution with time and the diffusive mixing between the droplet and the ambient gases dominates. Based on the ADI profile of fuel atoms, a criterion (tau 0.9P) for mode transition from evaporation to diffusion is proposed. Among the ambient gases investigated, the mode transition is the most difficult in the nitrogen ambient but the easiest in combustion exhaust gases. For multicomponent fuel droplets close to or in diffusion mode, with higher relative velocities, the relative difference between evaporation rates for light/heavy fuel components is reduced. This study demonstrates that supercritical conditions alone are insufficient for mode transition of evaporation.
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