Thermal structure of clean and contaminated free-surfaces subject to an impinging gas jet

• Published in: Experiments in fluids Vol. 38; no. 1; pp. 99 - 111
• Main Authors: Judd, K. Peter, Phongikaroon, Supathorn, Smith, Geoffrey B., Handler, Robert A.
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.01.2005; Berlin
• Subjects: Cleaning; Contamination; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Hydrodynamic waves; Imagery; Imaging; Infrared radiation; Instability; Instrumentation for fluid dynamics; Physics; Scars; Stability; Gas jet; Flow visualization; Free surface flow; Thermal imaging; Interactions; Air water interface; Surfactants; Experimental study
• ISSN: 0723-4864; 1432-1114
• DOI: 10.1007/s00348-004-0897-9

The thermal structure of clean and contaminated free-surfaces subject to the transient flow of a gas jet were investigated experimentally. The interface and near-surface flow were examined using optical high-speed (HS) motion analysis, infrared (IR) imagery, and laser-induced fluorescence (LIF). IR imagery revealed an instability in the form of thermal scars on the expanding circular surfactant front. The nature of this instability was explored by performing experiments with both clean and contaminated surfaces. LIF visualization techniques were used to gain insight into the nature of the near-surface flow field. This revealed the presence of a vortex ring that underwent an instability in which ringlets surrounded the primary core. Using simultaneous IR/LIF imaging of a fixed spatial region, it is shown that the thermal scars are spatially and temporally correlated with the near-surface ringlet structures, suggesting that the scars are a surface manifestation of the near-surface structures.