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Description
We derive a set of simple calculations to estimate the relative magnitude of net capillary pressure drop across a NWP blob driven within a periodic capillary tube during two-phase flow. The blob is large enough to remain in contact with the tube walls, and the corresponding hysteresis is expressed as the different receding and advancing contact angles of the two N/W menisci. We derive calculate the capillary pressure drop The calculations show that the net capillary pressure drop when hysteresis is considered is considerably larger that the bulk viscosity induced pressure drop for an extended domain of the N/W/PM system parameters and flow conditions. Results suggest that the capillarity effects associated to hysteresis should be taken into account in modelling two-phase flow in capillary tubes for an extended domain of flow conditions and N/W/PM system parameters.
| Country | Greece |
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