Numerical investigation of the effect of the shape of the nozzle on the flash boiling phenomenon
| Autor: | Piotr Łapka, Mateusz Śmiechowicz, Mirosław Seredyński, Andrzej Grzebielec, Emil Gromadzki, Adam Szelagowski |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:GE1-350
Materials science Vapor pressure Turbulence Nozzle Flow (psychology) 0211 other engineering and technologies 02 engineering and technology Conical surface Mechanics 010501 environmental sciences Flashing 01 natural sciences Mass flow rate 021108 energy lcsh:Environmental sciences 0105 earth and related environmental sciences Bar (unit) |
| Zdroj: | E3S Web of Conferences, Vol 128, p 07005 (2019) |
| ISSN: | 2267-1242 |
| Popis: | In this paper analysis of influence of the nozzle shape on the flash boiling phenomena is presented. The mixture model was applied to account for two-phase flow through the nozzle. The ZwartGerber-B lamri model was used to describe the dynamics of the water-vapor phase change process, with the relationship linking the saturation pressure and temperature of the fluid. The effect of the shape of the nozzle on the mass flow rate of the two-phase mixture was numerically investigated by considering thestepwise and conical geometry of its divergent part. At first analysis of the influence of grid size as well as the ways of turbulence and near wall region modelling on the mass flow rate of two-phase mixture were studied for the diameter of nozzle neck of 0.42 mm. Predictions were found independent onthese factors. Then simulations were carried out for three nozzle neck diameters (i.e., 0.62, 0.72 and 0.82 mm) and for several pressures (i.e., from 5 to 7 bar) and undercoolings (i.e., from 1 to 50 K)of water at the inlet. The shape of divergent part of the nozzle was found to not have effect on the mass flow rate of flashing water flowing through nozzle. |
| Databáze: | OpenAIRE |
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