## THERMAL SCIENCE

International Scientific Journal

### Thermal Science - Online First

online first only
### Numerical simulation of droplet evaporation based on the smoothed particle hydrodynamics method

**ABSTRACT**

Based on the Smoothed Particle Hydrodynamics method, a numerical model of SPH in multiphase flow evaporation accompanied with heat and mass transfer has been established, and phase transition of droplet evaporation is simulated. In this paper, an SPH mass transfer equation of gas phase in evaporation are proposed based on Fick's law. In order to solve the problem of large mass difference of particles at the phase interface during evaporation, the particle splitting and merging techniques are introduced, and the tensile instability of particles during the splitting and merging is weakened by artificial stress. Besides, by adding the surface tension model, the mutual penetration of particles at the gas-liquid interface is effectively prevented. On this basis, the evaporation of single droplet and interacting droplets without gravity is simulated. The results show that the evaporation time of single droplet in this study conforms to D2 law and is within the theoretical range. There is a great influence between interacting droplets in the process of evaporation. Only when dimensionless number C (droplet spacing/droplet diameter) is larger than 8, the influence between droplets can be approximately ignored.

**KEYWORDS**

PAPER SUBMITTED: 2023-03-11

PAPER REVISED: 2023-04-21

PAPER ACCEPTED: 2023-04-22

PUBLISHED ONLINE: 2023-05-13

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