Steady pressure-flow relationship in a cast of the upper and central human airways.


Pressure drops across the upper (larynx) and central airways of a human lung cast were measured at steady state inspiratory and expiratory flows. Air, He-O2 and SF6-O2 gas mixtures were used at tracheal Reynolds' numbers ranging from 145 to 30,000. The pressure-flow characteristics of the model were analysed using standard pressure-flow diagrams and Moody… (More)


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