Observing reversing currents




Membrane amplitude:9 mm Membrane amplitude:11 mm
As the amplitude of the membrane gets larger, a current develops and starts reversing from bottom to top .

Experimental conditions

Brunt-Väisälä period : 3.9 sec
Wave period: 15.7 sec.
The amplitude of the membrane was measured at the center of the membrane.

Filming conditions

(a) Speeded up 30 times; (b)Speeded up 230 times
(a) 15 fps; (b) 30fps