ISSN Online: 2377-424X
ISBN Print: 978-1-56700-474-8
ISBN Online: 978-1-56700-473-1
International Heat Transfer Conference 16
THERMAL CAPILLARY EFFECT ON THIN FILM EVAPORATION
Sinopsis
Thin film evaporation can significantly increase the evaporation heat transfer coefficient. In the current
investigation, based on momentum conservation, a mathematical model was developed including the disjoining
pressure, pressure difference across the liquid vapor interface, and pressure difference between the interface and
vapor pressure. In addition, the thermal capillary effect on the thin film evaporation was considered in the model.
Results show that the thermal capillary flow affects the film thickness, heat flux, interface temperature, and fluid
flow of liquid in the thin film region, which depends on the superheat. When super heat is low, the thermal
capillary flow has almost no effect on the thin film evaporation including the film thickness variation, heat flux
distribution, and interface. When the superheat is high, the thermal capillary flow becomes stronger, and the
flow direction is different from the flow direction of liquid in the thin film region. When superheat increases, the
average velocity of liquid flow becomes smaller and the contact angle larger.