Library Subscription: 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

EFFECT OF SURFACE TEMPERATURE AND AMBIENT PRESSURE ON WATER DROPLETS BEHAVIORS ON HEATED SURFACE

Get access (open in a dialog) DOI: 10.1615/IHTC16.bae.022863
pages 1135-1141

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.