Numerical Solution of Steam Flow in a Nozzle Using Different Non-equilibrium Condensation Models

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F16%3A00237588" target="_blank" >RIV/68407700:21220/16:00237588 - isvavai.cz</a>

Result on the web

<a href="http://www.sciencedirect.com/science/article/pii/S0096300315006918" target="_blank" >http://www.sciencedirect.com/science/article/pii/S0096300315006918</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.amc.2015.05.067" target="_blank" >10.1016/j.amc.2015.05.067</a>

Result language

angličtina

Original language name

Numerical Solution of Steam Flow in a Nozzle Using Different Non-equilibrium Condensation Models

Original language description

The paper presents three Eulerian models for the two-phase flow of a steam with a non-equilibrium condensation due to the rapid expansion. All models are based on the transport equations for the mass, momentum and total energy of the mixture. The models differ in the number of additional transport equations for the parameters of liquid phase. The models with two and four additional transport equations take into account homogeneous nucleation and growth of existing droplets. The last model with no additional transport equation is based on a switch from metastable to equilibrium state, i.e. a switch from zero to equilibrium wetness. Although this last model omits the droplet size, it can be particularly interesting for the simplified flow simulations in the first steps of steam turbine design (e.g. simulations of the circumferentially averaged flow in a meridional plane of several turbine stages). Presented numerical results of one- and two-dimensional flows in a convergent–divergent nozzle have been obtained using in-house codes based on the symmetrical operator splitting with a finite volume method used for the convection and a Runge-Kutta method used for time integration of source terms. The result discussion covers the comparison of three presented models in terms of Mach number, pressure and wetness prediction. It further covers the influence of grid density on the prediction of nucleation zone as well as a new thermodynamic closure alternative to the IAPWS-95 formulation.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BK - Liquid mechanics

OECD FORD branch

—

Project

<a href="/en/project/GAP101%2F11%2F1593" target="_blank" >GAP101/11/1593: Investigation of non-equilibrium steam condensation: A new approach</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Applied Mathematics and Computation

ISSN

0096-3003

e-ISSN

—

Volume of the periodical

272

Issue of the periodical within the volume

January

Country of publishing house

US - UNITED STATES

Number of pages

13

Pages from-to

657-669

UT code for WoS article

000364991600008

EID of the result in the Scopus database

2-s2.0-84947044288