  Dewetting of liquid films on solid surfaces in the presence of evaporation is
a common phenomenon and has been studied by many researchers. The previous
numerical approach has revealed that evaporation accelerates the dewetting
speed of the triple contact line and established correlations between the
dewetting speed and the surface wettability and superheating. However, such a
numerical calculation is time- and resource-consuming. ,We examine dewetting
physics and propose a time-averaged approach based on the multiscale theory.
The new approach averages the dewetting process over time and consists of only
several algebraic equations, making the problem easier to solve. It can produce
time-averaged values of essential quantities, such as the dewetting speed and
contact angle as a function of superheating, which agrees with the previous
numerical results. This simple approach is valuable for many applications, such
as modeling pulsating heat pipes and describing the microlayer dynamics under
growing vapor bubbles in nucleate boiling.
