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GPS-X Technical Reference

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The η for each gas is estimated using the following expression:<br />

Equation 6.60<br />

Suspended Growth Models 196<br />

where:<br />

molfro 2 = average mole fraction of oxygen in bubble (-)<br />

molfratmo 2 = mole fraction of oxygen in air (-)<br />

The average mole fraction of oxygen in the bubble is estimated as below:<br />

Equation 6.61<br />

where:<br />

molfrf feedO2 = mole fraction of oxygen in feed gas (-)<br />

molfrf outO2 = mole fraction of oxygen in out gas (-)<br />

wf feed = weight factor for averaging (-, default values is 1.0)<br />

The final expression for the DO saturation concentration at field conditions is as follows:<br />

Equation 6.62<br />

<strong>GPS</strong>-X <strong>Technical</strong> <strong>Reference</strong>

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