The Curious case of Ripples

“However, Ueno’s model makes three other predictions about these ripples which have never been observed until now. First, that the wavelength of ripples should increase as the angle of the inclined plane decreases; second that the wavelength should increases only gradually with an increase in the water supply; and finally that the ripples should move upward at about half the speed of the mean growth rate.
techreview
The bottom line is that they confirm the predictions. The wavelength can change in the way he predicted and ripples move slowly upwards, even though the water is flowing down.
There’s an interesting corollary to all this. In this work, the water always flows under the force of gravity. But what happens when aerodynamic forces also come into play or, in other words, how does wind effect the ripples?
That’s important because it could shed light on the process of freezing on aircraft wings and turbines, a significant and potentially life threatening problem.”
Read more at Tim’s Scared Stiff
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