Effects of stenotic severity on the flow structure in a circular channel under a pulsatile flow
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Stenosis is the drastic reduction in the cross-sectional area of blood vessel caused by accumulationsof cholesterol. It affects the blood flow property and structure from the fluid dynamic point of view. To understandthe flow phenomenon more clearly, a particle image velocimetry method is used and the fluid dynamiccharacteristics in a circular channel containing stenosis structure is investigated experimentally in thisstudy. Different stenotic-structured models made of acrylic material are subjected to a pulsatile flow generatedby an in-house designed pulsatile pump. The inner diameter of the tube inlet is 20 mm and the length of reducedarea for stenosis ranges between 35mm and 40mm. It is circulated continuously through a circularchannel by the pump system. Pressure is measured at four different sections during systolic and diastolicphase changes. The phase-averaged velocity field distribution shows a recirculation regime after the stenoticstructure. The effects of the stenotic obstructions are found to be more severe when the aspect ratio is varied.
Abstract
Stenosis is the drastic reduction in the cross-sectional area of blood vessel caused by accumulationsof cholesterol. It affects the blood flow property and structure from the fluid dynamic point of view. To understandthe flow phenomenon more clearly, a particle image velocimetry method is used and the fluid dynamiccharacteristics in a circular channel containing stenosis structure is investigated experimentally in thisstudy. Different stenotic-structured models made of acrylic material are subjected to a pulsatile flow generatedby an in-house designed pulsatile pump. The inner diameter of the tube inlet is 20 mm and the length of reducedarea for stenosis ranges between 35mm and 40mm. It is circulated continuously through a circularchannel by the pump system. Pressure is measured at four different sections during systolic and diastolicphase changes. The phase-averaged velocity field distribution shows a recirculation regime after the stenoticstructure. The effects of the stenotic obstructions are found to be more severe when the aspect ratio is varied.
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