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is the area of the duct, is the velocity of the fluid. The practicalities of mine ventilation led Atkinson to group some of these variables into one all-encompassing term: Area and perimeter were incorporated because mine airways are of irregular shape, and both vary along the length of an airway.
Mean airway pressure typically refers to the mean pressure applied during positive-pressure mechanical ventilation.Mean airway pressure correlates with alveolar ventilation, arterial oxygenation, [1] hemodynamic performance, and barotrauma. [2]
In general, compliance is defined by the change in volume (ΔV) versus the associated change in pressure (ΔP), or ΔV/ΔP: = During mechanical ventilation, compliance is influenced by three main physiologic factors:
In a nozzle or other constriction, the discharge coefficient (also known as coefficient of discharge or efflux coefficient) is the ratio of the actual discharge to the ideal discharge, [1] i.e., the ratio of the mass flow rate at the discharge end of the nozzle to that of an ideal nozzle which expands an identical working fluid from the same initial conditions to the same exit pressures.
= cross-sectional area of opening, ft² (assumes equal area for inlet and outlet) C d = Discharge coefficient for opening (typical value is 0.65) g = gravitational acceleration, around 32.2 ft/s² on Earth H d = Height from midpoint of lower opening to midpoint of upper opening, ft T I = Average indoor temperature between the inlet and outlet ...
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The metric equivalent flow factor (K v) is calculated using metric units: =, where [3]. K v is the flow factor (expressed in m 3 /h), Q is the flowrate (expressed in m 3 /h), SG is the specific gravity of the fluid (for water = 1),
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