Abstract
A stenosis is a narrowing in a tubular organ. In medicine, vessel stenosis poses health risk for people. In the last work, experimental investigation of pressure loss coefficient for varying stenosis eccentricity and shape for steady flow were performed. In this work, experimental investigation of pressure loss for varying stenosis eccentricity and shape under periodic flow were performed. Four models of different geometry were studied, two models are axisymmetric stenoses and two models are eccentric stenoses. All models were stenosis of 75% area reduction. The periodic flow, generated by a controllable pump, has sinus shape in an inlet. The measuring range of medium Reynolds number was from 500 to 1500, range of ratio between an amplitude and medium flow rate was from 0.2 to 0.6 and range of frequency was from 0.2 to 1 Hz. The pressure loss for each conditions was quantified by mean value, amplitude and phase shift against flow rate.
Highlights
The results show that the difference of maximum and minimum value of mean and amplitude local pressure loss increases with increasing Reynolds number
The results show that the value of mean and amplitude of local pressure loss is approximately same with stenosis number 1
The results show that this stenosis has lower the difference of maximum and minimum value of mean and amplitude local pressure loss
Summary
For example Siouffi et al [12] compared different types of pulsatile flows with physiological one This experimental work is focused on effect of stenosis geometry on pressure loss for unsteady flow, which have sinus shape in an inlet. Phase shift of local pressure loss is given by equation: All models have the diameter of unobstructed cross-section 14 mm, the diameter of obstructed crosssection 7 mm, the length of model 50 mm, the length of stenosis 5 mm The aim of this experimental study is determine, if pressure loss was affected more by shape of stenosis or by eccentricity
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