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Abstract. This paper deals with problem of mean-flow velocity profiles for a turbulent flow in a pipe of circular crosssection. There are mentioned some very well-known analytical formulas of mean-flow velocity profiles and also new formulas based on the vorticity density distribution over the pipe cross-section. All of them are analyzed and compared with a measurement. There is given an explanation of all coefficients and their physical meaning. Some formulas for the coefficients are improved on the basis of experimental data. There is also a discussion about the precision of all meanflow velocity profiles and there are given some ideas why they don't fit well in some regions of flow at the end of the paper.

Abstract. There are presented characteristics of the pipe junction for the case of the flow division in this paper. The pipe junction consists of one straight pipe, with the diameter 50 mm and one adjacent pipe with diameter 32 mm. The characteristics have been measured for five different angles of the adjacent pipe.

Abstract. Basic aim of this paper is to bring out the characteristics of the T-junctions. T-junction consists of the one straight pipe and the adjacent branch which can be inclined under various angle Ȗ. These characteristics were done for the T-junctions with equal diameters of all branches and for five different angles of the adjacent branch. There is also included comparison between characteristics obtained by the numerical calculation and by the experiment in this paper.