コラプシブルチューブ流れのヒステリシスと多価性

概要

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The purpose of this research is to examine the details of hysteresis which appears in the pressure-flow relation of collapsible tubes such as veins exposed to negative transmural pressure. To exclude human error in setting the flow rate, an electric control valve was introduced and was automatically controlled with a personal computer. Tube deformation was measured simultaneously with a laser displacement meter to obtain the displacement distributions. The hysteresis in which the pressure drop for increasing flow is larger than that for decreasing flow can be seen in the range of low flow rate. The tube shows self-excited oscillations for increasing flow and does not oscillate for decreasing flow in the range of high flow rate. It was found that the hysteresis for the low flow range is caused not only by elastic hysteresis but also by fluid dynamic hysteresis. It was also found that the lack of state uniqueness in the high flow range is caused by multiplicity which is due to different initial conditions for a nonlinear system.
一般社団法人日本機械学会の論文
1994-03-25