Abstract
A simple flow system incorporating a collapsible tube of silicon rubber is tested to determine the conditions under which the tube will experience self-excited oscillation of its walls. The results are presented as curves for the dimensionless frequency and time-averaged flow rate for a range of tube length-to-diameter ratios, Reynolds numbers and the ratios of transmural pressure to flow pressure drop. It is significant that no oscillations were detected for Reynolds numbers below about 1500, which is considerably higher than is found in the veins of a resting patient. The flow rate in general varies as should be expected, except, perhaps, at the onset of oscillation at low transmural pressures when it suffers a fairly abrupt decrease from its steady full flow value.
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