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PEM Fuel Cells by Ken S. Chen, Yun Wang

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3.4 Scaling and Dimensionless Groups

3.4.1 Scaling and Dimensionless Equations

Scaling an equation yields a mathematical description that is independent of physical units. Scaling is also often used to estimate the orders of magnitude for the terms of interest. In the previous section, the conservation equations of momentum, energy, and species concentration are derived; they are summarized as follows:

32719.jpg (Eq. 3-38)

32727.jpg (Eq. 3-39)

32738.jpg (Eq. 3-40)

For each ...

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