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Using a specially designed experimental set up, we have studied the so-calledcontinuous to intermittent flow transition in sand piles confined in aHele-Shaw cell where the deposition height of the sand can be controlled.Through systematic measurements varying the height and the input flow, we haveestablished, for the first time, how the size of the pile at which thetransition takes place depends on the two parameters studied. The resultsobtained allows to explain, at least semi-quantitatively, the observationscommonly reported in the literature, carried out in experiments where thedeposition height is not controlled.

Intermittent and continuos flows in granular piles: effects of controlling the feeding height