Influence of Liquid Film Properties on Shear-Driven Film Separation at a Sharp Corner Due to Wave Formation

Abstract

Formation of large amplitude waves (LAW) at the gas-liquid interface in shear-driven liquid film flows impact the liquid mass separated from the surface when the film encounters a sharp corner. This problem is of great interest in design of prefilming atomizers, liquid-gas separation devices, and engine fuel induction systems. Experimental studies show LAW formation and propagation are affected by liquid film properties such as surface tension and viscosity. In this study, LAW amplitude characteristics are quantified based on an empirical intensity parameter derived from imaging analysis. Results show that increasing viscosity results in more damping in both LAW formation and propagation along the fetch length, which consequently decreases the liquid mass separation at the corner. However, changes in liquid film surface tension leads to complicated behavior at the film interface. Decreasing surface tension reduces LAW formation but increases the coalescences of the LAW along the fetch length. The result is increased mass separation at a sharp corner for decreased surface tension.

Meeting Name

14th International Conference on Liquid Atomization and Spray Systems, ICLASS 2018 (2018: Jul. 22-26, Chicago, IL)

Department(s)

Mechanical and Aerospace Engineering

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Publication Date

26 Jul 2018

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