Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

EVAPORATION OF SINGLE WATER DROPLET UNDER LASER IRRADIATION

Get access (open in a dialog) DOI: 10.1615/IHTC16.bae.023566
pages 787-799

Abstrakt

In order to dominate the evaporation characteristic of single water droplet under the laser irradiation, an experimental apparatus is set up and the corresponding numerical simulation analysis is developed. As the evaporation process occurring, an infrared thermal camera is employed to obtain the temperature distribution pictures of droplet surface. An electronic magnifier is taken adopt to recognize the dimension variation, combining with the image analysis software. The initial diameter of the droplet is 1563 micron, and the kind of wavelength of the irradiation laser is 1313 nanometer with 1.05W laser power. The emissivity at droplet surface is also solved by using the Monte Carlo method and Ray Tracing method so as to compare the temperature at droplet surface in simulation with that in experiment. Meanwhile, in the numerical simulation, the water droplet is seemed as a semitransparent medium at the chosen wavelength, and the Monte Carlo method and Ray Tracing method are used to compute the non-uniform absorption. Moreover, the three-dimensional transient conduction in droplet and the heterogeneity of the internal temperature in static gaseous environment are solved by finite volume method with changed boundary. The results show, the variation of the size in simulation during evaporation is accurately in keeping with that from experiment, and the highest temperature which are revised according to the emissivity at the droplet surface in simulation is well in keeping with that in experiment all the time and the max value of the highest temperature of the droplet surface takes place at nine seconds from the beginning of evaporation approximately.