a numerical study on capillary-evaporation behavior of porous wick in electronic cigarettes.

Introduction:
This text is a summary of a scientific study on the capillary-evaporation behavior of porous wick in electronic cigarettes. The study establishes a mathematical model based on heat and mass transfer processes to describe the atomization of e-liquids in a single puff. The model incorporates dominant capillary-evaporation effects and predicts liquid temperature, vaporization rate, and thermal efficiency under various operating conditions. The study also validates the model's prediction through experimental studies.

Key Points:

* The study establishes a mathematical model to describe the atomization of e-liquids in a single puff based on heat and mass transfer processes in the porous wick.
* Dominant capillary-evaporation effects are incorporated into the model, and the liquid temperature, vaporization rate, and thermal efficiency are predicted under various operating conditions.
* Experimental studies are conducted to validate the model's prediction, and the results show that a higher PG/VG ratio in the e-liquid promotes energy transfer for vaporization and reduces the e-liquid temperature.
* The study finds that wick porosity affects thermal efficiency more significantly than electrical power and e-liquid composition.
* The vaporization rate increases with a higher wick porosity in a certain range.
* The modeling results suggest that a greater wick porosity and a higher PG ratio in e-liquids help improve the overall thermal efficiency.

Main Message:
The study highlights the importance of understanding the thermophysics behind capillary-evaporation behavior in electronic cigarettes. By establishing a mathematical model and validating it through experimental studies, the study provides valuable insights into the effects of electrical power, e-liquid composition, and wick porosity on atomization and energy transmission processes. The findings suggest that a greater wick porosity and a higher PG ratio in e-liquids can help improve the overall thermal efficiency and avoid atomizer overheating. These results have important implications for the design and regulation of electronic cigarettes.

Gao Y, Li D, Ru J, et al. a numerical study on capillary-evaporation behavior of porous wick in electronic cigarettes. Scientific reports. 2021;11(1):10348. doi:10.1038/s41598-021-89685-4