Stepanov O.E., Kornienko Yu.N., Galkin I.Yu., Pronin A.A., Bykov M.A.
Experimental and Design Organization "GIDROPRESS", Podolsk, Russia
The problem sharp increase of viscous shear stress in vertical two-phase flow is very actual question for atomic energy. Air-water flow in vertical cylindrical channel with Reynolds numbers are 19000, 38000 and void fraction 0—33 % was considered. Radial profiles of local void fraction and liquid velocities were solved also as wall friction in bubble flow. Verification of 3D CFD-model by experimental data of local void fraction and liquid velocity profiles on channel’s area and wall friction in bubble flow regime was executed. A good simulation of effect anomaly increase of wall friction in result of bubbles concentration, velocity gradient increase near the wall and turbulence shear stresses by wall bubbles were found. The comparison calculation results founded on Armand’s correlation, the analog which using in such codes as RELAP5, KORSAR/GP, and shows that these codes could not solve this effect. These results could be used for cross-verification of as 3D, so 1D codes and improves of its thermo-hydraulic models.
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