Development of Method for Measuring Near-Surface Turbulence

by Takeharu Etoh, Kinki Univ, Higashi-Osaka, Japan,
Kosei Takehara, Kinki Univ, Higashi-Osaka, Japan,

Document Type: Proceeding Paper

Part of: Air-Water Mass Transfer


New techniques for tracking particles in fluid are presented. A method to make micro-capsules which are filled with pure water and covered with a thin film of polystyrene is developed. Their mean specific gravity is 1.0064 and mean diameter is 295 microns. A new method is proposed to objectively determine the threshold of brightness, which separates particle images from the background. Finally, a new algorithm is now under development for tracking particles, in which Kalman's filtering theory and the chi-square test are applied.

Subject Headings: Turbulence | Flow measurement | Fluid flow | Water management | Polystyrene | Turbulent flow | Filters | Particles

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