SimpleSlip_L4

Created Mittwoch 31 Januar 2018

Simple slip model according to Zivi [1] which is suitable for vertical upward annular flow.

1. Purpose of Model

Model provides information on phase slip and calculates additional mixed cup properties for mixture energy equation. It bases on the Zivi model which was proposed for annular flow with no liquid entrained in the vapour core.


2. Physical Insight



3. Limits of Validity



4. Interfaces



5. Nomenclature


6. Governing Equations



The mixed-cup specific enthalpy is calulated as follows (equation not explecitly solved for ):

with the density defined as in-situ mixture property

The void fraction of a control volume is calculated as follows:

The slip of the phases is calculated accoring to the Zivi model:


7. References


[1] S.M. Zivi: "Estimation of steady-state steam void fraction by means of the principle of minimum entropy production", J. Heat Transf., 1964

8. Version History



Backlinks: ClaRa:Components:HeatExchangers:FlatTubeFinnedHEXvle2gas L4 ClaRa:Components:HeatExchangers:PlateHEXvle2vle L4