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Unify flowrate / velocity interface #381

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Unify flowrate / velocity interface #381

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4b9c934
Update flow rate, velocity documentation
jbreue16 Mar 28, 2025
b6a5c54
fixup!
jbreue16 Mar 28, 2025
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5 changes: 3 additions & 2 deletions doc/modelling/unit_operations/general_rate_model.rst
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Expand Up @@ -264,6 +264,7 @@ Specification of flow rate / velocity and direction
Since volumetric flow rates are specified for each network connection, the unit operation can infer its interstitial velocity via

.. math::
:label: interstitialVelocity

\begin{aligned}
u = u_{\text{int}} = \frac{F_{\text{in}}}{A \varepsilon_c},
Expand All @@ -280,9 +281,9 @@ The final behavior for axial flow models is controlled by the interplay of cross

- If cross section area :math:`A` is given and :math:`u` is not, :math:`u` is inferred from the volumetric flow rate.

- If :math:`u` is given and :math:`A` is not, the volumetric flow rate is ignored and the provided interstitial velocity is used.
- If :math:`u` is given and :math:`A` is not, the provided interstitial velocity is used, i.e. the column cross section is prescribed by the volumetric flow rate as per Eq. (:eq:`ModelColumn`).

- If both cross section area :math:`A` and interstitial velocity :math:`u` are given, the magnitude of the actual interstitial velocity :math:`u` is inferred from the volumetric flow rate and the flow direction is given by the sign of the provided :math:`u`.
- If both cross section area :math:`A` and interstitial velocity :math:`u` are given, only the sign of the provided interstitial velocity determines the flow direction while the magnitude of the actual interstitial velocity :math:`u` is inferred from the volumetric flow rate.

The final behavior for radial flow models is controlled by the interplay of column length/height and interstitial velocity coefficient:

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