Dynamic thin liquid films driven by an adjacent gas flow have been subject to many investigations due to their presence in many engineering applications. More specifically though, the behavior of such films at a sharply expanding corner has received little attention, but can be observed in internal combustion engines, liquid atomizer systems, and refrigerant flows in evaporators. Efforts to validate computational models of the propagation and separation of films are limited by the lack of reliable non-intrusive techniques to measure and analyze dynamic film parameters. In this...