VI.2. Effect of variable liquid properties on the flow structure within shear-driven wall films

摘要

Liquid wall films driven by air flow occur in fuel preparation processes of advanced prefilming gas turbine compustor nzzles or in intake manifolds of SI-engines. There is a need to develop new and more accurate models to describe the heat transfer from the wall to the film. To obtain data necessary for the modeling a new measurement device in combination with an enhanced data processing technique has been developed. The device combines two novel measurement systems. It consists of a film structure measurement system and a specially adapted LDV-system with a miniaturized probe volume. This combination allows simultaneous measurements of film thickness and flow velocity within the film. For the first time detailed information of the internal flow structure are provided under consideration of the effect of variable liquid properties on the film hydrodynamics.