Table 1 Baseline condition, valve performance and gravity application time results
Parameters | No valve | Perfect valve | "Real" valve | Leaky valve | Gravity test |
|---|---|---|---|---|---|
Diameter (cm) | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 |
Length (m) | 1 | 1 | 1 | 1 | 1 |
Young's modulus (kPa) | 1000 | 1000 | 1000 | 1000 | 1000 |
Poisson's ratio | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
Blood viscosity (mPas) | 4 | 4 | 4 | 4 | 4 |
Blood density (Kgm -3 ) | 1000 | 1000 | 1000 | 1000 | 1000 |
Gravity application time (s) | Near instantaneous | Near instantaneous | Near instantaneous | Near instantaneous | 0.1 |
Valve distribution | No valve | One | One | One | One |
Valve location from inlet (m) | No valve | 0.5 | 0.5 | 0.5 | 0.5 |
Valve performance | No valve | Perfect | "Real" | Leaky | Perfect |
First peak (mmHg) | 136.9 (18.2 kPa) | 60.2 (8.01 kPa) | 60.3 (8.02 kPa) | 65.4 (8.69 kPa) | 50.3 (6.69 kPa) |
Second peak (mmHg) | 127.1 (16.9 kPa) | 81.9 (10.9 kPa) | 81.9 (10.9 kPa) | 115.8 (15.4 kPa) | 72.6 (9.66 kPa) |
Maximum pressure (mmHg) | 136.9 (18.2 kPa) | 93.3 (12.4 kPa) | 93.9 (12.4 kPa) | 115.8 (15.4 kPa) | 99.3 (13.2 kPa) |
Dynamic pressure ratio | 1.83 | 1.25 | 1.25 | 1.51 | 1.33 |
Valve closed time (s) | No valve | 0.17 | 0.17 | 0.11 | 0.16 |
Maximum collapse (%) | 0.02 | 20.2 | 20.4 | 3.57 | 8.17 |
Maximum expansion (%) | 15.1 | 9.89 | 9.89 | 12.5 | 10.6 |