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Numerické řešení dvourozměrného proudění v kanálu
Trefilík, J. ; Šimonek, J. ; Kozel, K. ; Příhoda, Jaromír
The work deals with the numerical simulation of viscous incompressible and compressible 2D flows. Numerical solution was carried out by the finite volume method and the Mc Cormack predictor-corrector scheme. Turbulent flow is modelled by an algebraic model and by the two-equation model. Numerical solution of incompressible and compressible flow over the DCA profile in a channel is presented.
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Numerická simulace separovaného dvoufázového proudění vařící se vody v kanálu o tvaru cívky
Novák, Aleš ; Hrubý, Jan
This work deals with a quasi-1D mathematical model of flow of a boiling liquid-vapor mixture in a coil-shaped duct heated from the outer side of the coil. The liquid and gas phases are allowed to flow at different velocities (stratified flow regime). The model simulates a modification of the laboratory steam generator built in Institute of Thermomechanics AS CR. The liquid is centrifuged to the heated wall thus enhancing the heat transfer. The model also includes heat conduction in the metal body of the steam generator.
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Vlastnosti trysek – experimentální ověření na zažízení stavěném pro výzkum šroubovicových nestabilit
Tesař, Václav ; Kellnerová, Radka ; Kukačka, Libor ; Kordík, Jozef
Nozzle characterisations in current use may be described as zero-order (neglected loss) and first-order (constant loss coefficient). The first author (V. Tesar) introduced in 1985 a second-order theory, fully predicting all the variations of nozzle properties with Reynolds number Re. The basic idea is an assumption of the loss being entirely specified by displacement effect of wall boundary layer in the exit. The other assumption is the layer thickness being governed by laminar boundary layer growth law. All evidence for this theory so far was only indirect. This paper presents recent direct experimental verification by measurements of boundary layer profiles on a large-scale nozzle model across a wide range of Re. The predictions of the 1985 model are fully supported.
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