| r""" |
| Pore-scale models for calculating the conductance of conduits. |
| """ |
|
|
|
|
| __all__ = [ |
| '_poisson_conductance', |
| '_get_key_props', |
| ] |
|
|
|
|
| def _poisson_conductance(phase, |
| pore_conductivity=None, |
| throat_conductivity=None, |
| size_factors=None): |
| r""" |
| Calculates the conductance of the conduits in the network, where a |
| conduit is (1/2 pore - full throat - 1/2 pore). See the notes section. |
| |
| Parameters |
| ---------- |
| phase : OpenPNM Phase |
| The object which this model is associated with. This controls the |
| length of the calculated array, and also provides access to other |
| necessary properties. |
| pore_conductivity : str |
| Dictionary key of the pore conductivity values |
| throat_conductivity : str |
| Dictionary key of the throat conductivity values |
| size_factors: str |
| Dictionary key of the conduit size factors' values. |
| |
| Returns |
| ------- |
| g : ndarray |
| Array containing conductance values for conduits in the |
| geometry attached to the given physics object. |
| |
| Notes |
| ----- |
| This function requires that all the necessary phase properties |
| already be calculated. |
| |
| """ |
| network = phase.network |
| cn = network.conns |
| Dt = phase[throat_conductivity] |
| D1, D2 = phase[pore_conductivity][cn].T |
| |
| SF = network[size_factors] |
| if SF.ndim == 2: |
| F1, Ft, F2 = SF.T |
| g1 = D1 * F1 |
| gt = Dt * Ft |
| g2 = D2 * F2 |
| return 1 / (1 / g1 + 1 / gt + 1 / g2) |
| else: |
| |
| F = network[size_factors] |
| return Dt * F |
|
|
|
|
| def _get_key_props(phase=None, |
| diameter="throat.diameter", |
| surface_tension="throat.surface_tension", |
| contact_angle="throat.contact_angle"): |
| """ |
| Returns desired properties in the correct format! See Notes. |
| |
| Notes |
| ----- |
| Many of the methods are generic to pores and throats. Some information may |
| be stored on either the pore or throat and needs to be interpolated. |
| This is a helper method to return the properties in the correct format. |
| |
| TODO: Check for method to convert throat to pore data |
| |
| """ |
| element = diameter.split(".")[0] |
| if element == "pore": |
| if "throat" in surface_tension: |
| sigma = phase.interpolate_data(propname=surface_tension) |
| else: |
| sigma = phase[surface_tension] |
| if "throat" in contact_angle: |
| theta = phase.interpolate_data(propname=contact_angle) |
| else: |
| theta = phase[contact_angle] |
| if element == "throat": |
| if "pore" in surface_tension: |
| sigma = phase.interpolate_data(propname=surface_tension) |
| else: |
| sigma = phase[surface_tension] |
| if "pore" in contact_angle: |
| theta = phase.interpolate_data(propname=contact_angle) |
| else: |
| theta = phase[contact_angle] |
|
|
| return element, sigma, theta |
|
|
