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Table 1 Loss Coefficients (k) and Equivalent Linear Resistances (R) for the Rp5, Rp20, and Rp50 Parabolic Resistors

From: Bench and mathematical modeling of the effects of breathing a helium/oxygen mixture on expiratory time constants in the presence of heterogeneous airway obstructions

Ā Ā Ā 

R[cmH 2OI -1ā€‰s]

Resistor

k

Q[I/min]

Air

He/O 2

Rp5

3.3

20

0.9

0.3

Ā Ā 

60

2.7

0.9

Rp20

21.5

20

5.8

2.0

Ā Ā 

60

17.5

6.1

Rp50

132.9

20

36.1

12.7

Ā Ā 

60

108.4

38.0