What are streamline pathline and streakline for fluid motions

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[Elementary fluid dynamics] • This is a talk on how we can illustrate the fluid motions by using the steamlines, pathlines and streaklines. In this talk, the aim is for how we can understand the streamline, pathline and streakline, and what are the differences among them. This includes: • the definitions of streamline, pathline and streakline • illustrations of the streamline, pathline and streakline using an example of a steady flow past an airfoil • the dynamic equation for pathline and the mathematical equation for streamline • an example to show the same lines for streamline and pathline in a steady flow • A summary of streamline, pathline na 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