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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

THERMAL CAPILLARY EFFECT ON THIN FILM EVAPORATION

Get access (open in a dialog) DOI: 10.1615/IHTC16.bae.024263
pages 1035-1043

Résumé

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.