Theoretical Gas Phase Mass Transfer Coefficients for Endogenous Gases in the Lungs

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Gas phase mass transfer coefficients for nitric oxide (NO), ethanol (EtOH), and water vapor (H2O) were determined for typical conducting airway geometry and tracheal flows (5 × 10−5 and 5 × 10−4m3 s−1), by solving the steady-state two-dimensional diffusion equation. A constant absolute production rate with first order consumption reactions in pulmonary tissue was assumed for NO. For EtOH and H2O, constant concentrations were assumed in the blood and tissue, respectively. Results, expressed in terms of the average Sherwood number (Symbol) were correlated with the Peclet (Per) number, and the length-to-diameter (L/D)

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