E3S Web Conf.
Volume 128, 2019XII International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT 2019)
|Number of page(s)
|Internal Flow and Heat Transfer
|08 November 2019
Numerical investigation of the effect of the shape of the nozzle on the flash boiling phenomenon
Institute of Heat Engineering, Faculty of Power and Aeronautical Engineering,Warsaw University of Technology,
21/25 Nowowiejska St.,
2 Eneon sp. z o.o., 200 Aleje Jerozolimskie St. 02-486, Warsaw, Poland India
* Corresponding author: firstname.lastname@example.org
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.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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