Coating Terms

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When a closed half-filled bottle of wine, turned upside-down after shaking, it is seen that the wine in the bottle starts to climb the walls of bottle. Since, Italian physicist Carlo Marangoni explained the physicochemical mechanism lying under this phenomenon at the beginning of 1990’s, it’s called Marangoni effect. Alcohol in the thin wet film on the lateral surface of partially full bottle of wine evaporates more rapidly than water. Hence, alcohol amount decreases in these parts, resulting in increase in water concentration. The surface tension of pure water is higher than that of pure ethanol. Therefore, the surface tension of the liquid film from which alcohol evaporated increases. Then, a flow gradient occurs from the bulk part of wine which has lower surface tension, to the thin film layer on the sides with higher surface tension.