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 Pulsatile Flow in a 180-deg Curved Tube
Tác giả hoặc Nhóm tác giả: Le Minh Duc, Ching Min Hsu, Rong Fung Huang
Nơi đăng: Invited Speaker. Proceedings of the 8th International Mechanical Engineering Research Conference (IMERC2018). January 18-19, 2018. Michael Richartz Theatre, University of San Carlos, Cebu city, Philippines.; Số: 08;Từ->đến trang: 1-14;Năm: 2018
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
ABSTRACT
Experimental measurements of flow patterns and velocity characteristics in a circular 180o curved tube due to pulsatility condition are investigated using particle image velocimetry technique. A pulsatile pump was used to simulate pulsatile pressure wave of human heart beats with the stroke rate of 1.2 Hz, volume rate of 70 ml/stroke, and systole/diastole of 45%/55%. The working fluid is a mixture of water and glycerol, which has a kinematic viscosity of 3.93 ´ 10-6 m2/s and a density of 1.13 g/cm3 at 37oC. The Dean and Womersley numbers are 728 and 17.31, respectively. The flow evolution processes, velocity distribution, and wall-shear stress during systolic and diastolic phases are observed and presented by using phase resolve ensemble-averaged method. It is found that, in the systolic phase, the flow is fully developed around the curvature region during the acceleration period, while the flow separation occurs on the inner wall of the mid-arch region during the deceleration period. Large reversed flow zone is induced at the leading cross-sections of the downstream tube during the deceleration period of the systolic phase. The wall-shear stresses present large values around the outer and inner walls of the entrance of upstream tube and the mid-arch region during the systolic phase. The low values of wall-shear stresses are found around the outer wall of the arch region. In the diastolic phase, the wall-shear stress exhibits relatively low values due to the appearance of the large reversed flow zone. The oscillating wall-shear stress is relatively related to the flow characteristics.
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