Technique for hydraulic calculation of a vertical steam generatoring channel

The application of technique for hydraulic calculation of two-phase flow to high pressure steam generatoring channels is described. The assumption, that the effect of disturbed liquid film on pressure losses in steam-water flow is similar to the effect of the wall roughness on pressure losses in one-phase flow, forms the basis of the calculational technique. But in comparison with all known models, field of application of the above technique ranges from underheated water to superheated steam. For this aim, all ranges of mass steam content (relative enthalpy) are divided in 5 typical zones. The calculation is conducted with the help of appropriate dependence according to the range of the initial steam content value (average value along the tube length). The program for calculation of water pressure losses, steam-water flow, overheated steam at raising flow in Vertical tubes is worked out on the basis of the above technique. The program demonstrated proper efficiency in the following interval of working parameters: 68.8 <= p <= 108 bar 500 <= rhoω <= 4000 kg/(m2s), 4x10-3 <= d <= 30x10-3 m; 0 <= q <= 0.6 Mwt/m2, 150 deg C <= t <= 5000 deg C. The broad verification program established that the maximal error, while calculating relative pressure losses, does not exceed +-15% for the majority of data