ISSN Online: 2377-424X
ISBN Print: 978-1-56700-474-8
ISBN Online: 978-1-56700-473-1
International Heat Transfer Conference 16
EFFECT OF SURFACE TEMPERATURE AND AMBIENT PRESSURE ON WATER DROPLETS BEHAVIORS ON HEATED SURFACE
Abstract
Droplet impact on heated solid surface normally happens in numerous industrial applications. In general, droplet
impact on a heated solid surface can experience difference behaviors, like evaporation, boiling, splash or bounce,
and these behaviors are determined by numerous parameters, including drop parameters, ambient conditions and
wall characteristics. Fundamentally understanding how these parameters affect the droplet impact process is of
great importance for the development of industrial applications. In this study, we built an experimental setup to
investigate the effect of surface temperature and ambient pressure on the water droplets impact on a heated
silicon surface. The silicon surface temperatures ranging from 40 to 200 °C and ambient pressures ranging from
0.1 to 0.5 bar were studied. The results show that under a fixed ambient pressure, the droplets behaviors varies
from film evaporation to film boiling when increasing the surface temperature, and the Leidenfrost point is
found to be around 195 °C. The critical surface temperatures for each behavior increase with the ambient
pressure.