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- W2772029183 abstract "The appearance of bubbles was determined in three different wind wave facilities utilizing an optical bright field technique. Based on the bubble detection algorithm by W. Mischler [20], an algorithm has been developed by means of which bubbles and their sizes can be detected automatically. The method is applicable up to moderate to high bubble densities. At the Aeolotron bubble detection up to the water surface is feasible. It has been shown that the density of bubbles correlates to wind speed, water conditions, the distance to the water surface as well as to the tank geometry. Observations show an increased bubble density in salt water compared to fresh water at the same wind conditions.A study on the influence of lower Butanol concentrations of about 50ml/m^3 was carried out. Low Butanol concentrations in the water lead to an increased density of bubbles and additionally, as could be shown in the Aeolotron, a significant increase of very small bubbles (r<65µm).Adding Butanol seems to be a good, non-corrosive substitute for seawater. The influence of the fetch length was systematically researched by carrying out measurement series in the annular wind wave facility in Heidelberg as well as measurement series in linear wind wave facilities in Marseille, France and Kyoto Japan, both of which have different sizes and fetch lengths. Comparing these three wind wave facilities a high correlation between the appearance of bubbles and the fetch length could be detected. Analysis of fresh water measurements at hurricane like wind conditions lead to the discovery of a saturation effect on the appearance of bubbles." @default.
- W2772029183 created "2017-12-22" @default.
- W2772029183 creator A5025316580 @default.
- W2772029183 date "2017-01-01" @default.
- W2772029183 modified "2023-09-25" @default.
- W2772029183 title "Bubble characteristics from breaking waves in fresh water and simulated seawater" @default.
- W2772029183 doi "https://doi.org/10.11588/heidok.00023754" @default.
- W2772029183 hasPublicationYear "2017" @default.
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