An optical study of the heat transfer characteristics of an evaporating thin liquid film

An experimental and theoretical study of the heat transfer characteristics of an evaporating extended meniscus was performed using a circular capillary feeder system. The capillary feeder was designed to improve the stability of liquid menisci at higher heat flux conditions. It was found that the stability of the liquid meniscus at higher heat flux can be enhanced by reducing both the size of the gap at the exit of the capillary feeder and the frictional loss in the capillary feeder system.;The film thickness profile in the range 3nm ;The augmented Young-Laplace equation model (AYLM) was compared to the experimental results. Successful agreement was obtained between them. The study demonstrated that a linear relationship exists between the maximum heat flux (q;A Capillary Force Model (CFM) was used to verify the augmented Young-Laplace equation model. Good agreement between the two models was obtained. The study of a force balance at steady state within a liquid meniscus conducted at various heat inputs elucidated the effect of heat input on the average shear stress at the solid-liquid interface.;The study showed that the slope of the meniscus is strong function of the heat flow rate per unit length in the contact line region and a linear relationship between the slope and the heat flow rate per unit length of the contact line was found on a logarithmic plot for several test fluids at different heat inputs for different capillary feeder systems.