Structure of Swirling Flow in the Channel Branching Area at Moderate Reynolds Numbers

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Аннотация

The results of experimental studies of steady-state swirling flow in the area of channel branching, that imitates the proximal end-to-side anastomosis of the human femoral artery, are given. The experiments were carried out at a Reynolds number of 1460. This corresponds to the range of physiological values when estimating by the maximum blood flow rate in the artery during the period of cardiac contractions. For both branches, an equal ratio of the flow rates was maintained. At the inlet to the branching area, the degree of flow swirl was equal to 0.125. Using the SIV (Smoke Image Velocimetry) technique, flow was visualized and the instantaneous vector flow velocity fields of each branch were measured. The main patterns of the influence of swirl on the vortex structure of flow in the main artery below the branching area and in the shunt have been revealed. The possibility of using flow swirl to create more favorable hemodynamic conditions in the anastomotic area is being considered. A particular attention is paid to the appearance of signs of local flow turbulization in the presence and absence of swirl.

Толық мәтін

Рұқсат жабық

Авторлар туралы

V. Molochnikov

Kazan Scientific Center of the Russian Academy of Sciences; Tupolev Kazan National Research Technical University

Хат алмасуға жауапты Автор.
Email: vmolochnikov@mail.ru
Ресей, Kazan; Kazan

I. Nikiforov

Kazan Scientific Center of the Russian Academy of Sciences

Email: ilya.nkfrv1@gmail.com
Ресей, Kazan

N. Pashkova

Kazan Scientific Center of the Russian Academy of Sciences

Email: pashkova-2000@mail.ru
Ресей, Kazan

Әдебиет тізімі

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Әрекет
1. JATS XML
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2. Fig. 1. Schematic diagram of the working area of the plant and coordinate system.

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3. Fig. 2. Interior view of the vane swirler.

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4. Fig. 3. Variation of the degree of swirl with increasing distance from the swirler.

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5. Fig. 4. Profiles of the longitudinal component of the flow velocity (a) and its RMS pulsations (b) in a smooth channel downstream of the swirler.

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6. Fig. 5. Profiles of the circumferential component of the flow velocity in the channel downstream of the swirler.

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7. Fig. 6. Still images of flow visualisation in the region of channel branching (proximal anastomosis) at Re = 1460: a - without flow twist; b - with flow twist at Y = 0.125.

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8. Fig. 7. Velocity profiles in branch Q1: a - without twisting; b - with flow twisting.

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9. Fig. 8. Dependences of the distribution of the longitudinal component of the flow velocity along the length of the branch Q1 at different distances from the symmetry plane.

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10. Fig. 9. Profiles of RMS velocity pulsations in branch Q1: a - without twisting; b - with flow twisting.

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11. Fig. 10. Variation of maximum values of pulsation intensity of the longitudinal component of the flow velocity in the branch Q1: 1 - in the absence of twisting; 2 - at the upper and 3 - lower boundaries of the twisted flow braking region.

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12. Fig. 11. Degree of flow twist in branch Q1.

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13. Fig. 12. Distribution of the circumferential component of the flow velocity along the channel radius in branch Q1.

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14. Fig. 13. Profiles of the longitudinal velocity component in branch Q2: a - with twist; b - without flow twist.

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15. Fig. 14. Profiles of RMS pulsations of the longitudinal component of the flow velocity in branch Q2: a - with twist; b - without flow twist.

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16. Fig. 15. Variation of maximum values of pulsation intensity of the longitudinal component of the flow velocity in branch Q2: 1 - in the absence of twisting; 2 - under conditions of flow twisting.

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17. Fig. 16. Oscillograms of the longitudinal velocity component in the area of flow inhibition (velocity defect) of branch Q1 at x / d = 1.3: 1 - y / d = 0.46 (lower boundary of the braking zone); 2 - high-speed flow below the braking zone; 3 - y / d = 0.76 (upper boundary of the braking zone).

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18. Fig. 17. Intermittent flow pattern in branch Q1 just beyond the braking zone at x / d = 2.8.

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19. Fig. 18. Comparison of pulsation spectra of the longitudinal component of the flow velocity in branch Q1: 1 - x / d = 2.8; y / d = 0.76 (behind the braking zone); 2 - x / d = 1.3; y / d = 0.46 (mixing layer at the bottom of the braking zone).

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20. Fig. 19. Flow velocity oscillograms in branch Q1 with no twist at x / d = 1.5: 1 - y / d = 0.16 (in the high-speed jet zone above the flow breakaway region); 2 - y / d = 0.52 (in the mixing layer at the boundary of the breakaway region).

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21. Fig. 20. Comparison of pulsation spectra of the longitudinal component of the flow velocity in branch Q1: 1 - x / d = 1.5; y / d = 0.52 (mixing layer at the boundary of the flow breakaway region); 2 - x / d = 4.5; y / d = 0.47 (mixing layer at the boundary of the downstream flow breakaway region).

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22. Fig. 21. Flow velocity oscillograms in the branch Q2 in the absence of twist: 1 - x / d = 1.0; y / d = 0.9 (in the high-speed jet zone above the flow breakaway region); 2 - x / d = 2.5; y / d = 0.85 (in the mixing layer at the boundary of the breakaway region).

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23. Fig. 22. Comparison of pulsation spectra of the longitudinal component of the flow velocity in branch Q2: 1 - x / d = 2.5; y / d = 0.85 (mixing layer at the boundary of the flow breakaway area in the zone of the highest RMS velocity pulsations); 2 - x / d = 4.5; y / d = 0.8 (mixing layer at the boundary of the flow breakaway area downstream).

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24. Fig. 23. Flow velocity oscillograms in branch Q2 in the presence of twist: 1 - x / d = 0.57; y / d = 0.76 (above the breakaway region at the beginning of its formation); 2 - x / d = 1.03; y / d = 0.65 (in the mixing layer in the region of the highest velocity pulsations).

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25. Fig. 24. Spectra of flow velocity pulsations in branch Q2 in the presence of flow twist: 1 - x / d = 1.03; y / d = 0.65 (in the mixing layer in the region of highest velocity pulsations); 2 - x / d = 3.1; y / d = 0.69 (in the mixing layer downstream).

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