Table 2.
CFD Predictions of Performance During Cyclic Breathing
| Aerosols | DFinlet+wye | DFETT | DFdevice | ED | Circuit exhaled dosea |
|---|---|---|---|---|---|
| CM wye T1 | |||||
| MMAD=880 nm | 22.4 | 3.2 | 25.6 | 42.3 | 32.1 |
| MMAD=1.78 μm | 23.1 | 10.3 | 33.4 | 34.4 | 32.2 |
| MMAD=4.9 μm | 29.7 | 32.0 | 61.7 | 10.3 | 28.0 |
| CM wye T2 | |||||
| MMAD=880 nm | 10.3 | 5.2 | 15.5 | 77.4 | 7.1 |
| MMAD=1.78 μm | 10.3 | 17.3 | 27.6 | 65.9 | 6.5 |
| MMAD=4.9 μm | 16.0 | 56.5 | 72.5 | 19.9 | 7.6 |
| SL wye T1 | |||||
| MMAD=880 nm | 5.8 | 2.4 | 8.2 | 54.5 | 37.3 |
| MMAD=1.78 μm | 7.9 | 6.9 | 14.8 | 48.0 | 37.2 |
| MMAD=4.9 μm | 17.3 | 36.4 | 53.7 | 18.3 | 28.0 |
| SL wye T2 | |||||
| MMAD=880 nm | 3.7 | 3.6 | 7.3 | 80.3 | 12.4 |
| MMAD=1.78 μm | 5.7 | 11.2 | 16.9 | 72.2 | 10.9 |
| MMAD=4.9 μm | 15.1 | 55.6 | 70.7 | 26.0 | 3.3 |
The table presents CFD predictions of performance during cyclic breathing including deposition fractions (DFs) in the 10-cm tubing inlet+wye, ETT, and total device, emitted dose (ED) from the ETT, and exhaled dose lost from the ventilation circuit during expiration.
a
Fraction of dose (as %) lost from the delivery circuit during the exhalation phase of cyclic breathing. This fraction does not include the fraction of dose lost from the lung during exhalation, which is calculated in Table 3.