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In this paper the numerical–experimental methodology of studying bubble flows is considered. The effective numerical CFD algorithms for 3D calculation of two-phase flows with explicitly chosen of interface boundary and calculation of surface tension forces are offered. The new high-precise experimental technique permitting to control and to describe 3D effects of bubble flows as average in time and space, so local instant is described. The main attention of this paper is focused on validation and verification of numerical model (before submitted at NURETH11 conference) as with usage of the tests, accessible from the literature and outcomes of experiments obtained in IT SB RAS (Novosibirsk).