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Lecture _ 3 Mechanics and Ventilation Fall 2007

Lecture _ 3 Mechanics and Ventilation Fall 2007 -...

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1. Review 2. Mechanics - Gas flow and airflow resistance 3. Ventilation A. Total ventilation B. Alveolar ventilation C. Dead space ventilation Respiratory Mechanics and Ventilation
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Summary From Last Class
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Summary From Last Class
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Summary From Last Class
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1. Mechanics - Gas flow and airflow resistance 2. Ventilation A. Total ventilation B. Alveolar ventilation C. Dead space ventilation Respiratory Mechanics and Ventilation
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Airflow Through Tubes
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Laminar Flow: - Parallel to sides of airway - Depends on viscosity of air - Flow is proportional to driving pressure (∆P) - Low flow rates = decrease in resistance R = 8nl / πr 4 n = viscosity l = length r = radius Critical importance: If the radius is halved, the R increases 16 fold Gas Flow and Resistance
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Turbulent/Transitional Flow: - Related to density of gas - Increase in gas density increases pressure drop - Likely to occur when the tube diameter large and the velocity is high (i.e. trachea) Reynolds number = 2rvd/n r = radius, v = velocity d = density, n = viscosity - Reynolds number > 2000 = turbulent flow
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