Semi-analytical model for the prediction of the Wilson point for homogeneously condensing steam flows

Lucia Azzini; Matteo Pini; Piero Colonna

doi:10.1016/j.ijheatfluidflow.2018.01.004

Semi-analytical model for the prediction of the Wilson point for homogeneously condensing steam flows

Lucia Azzini, Matteo Pini, Piero Colonna

Flight Performance and Propulsion

Research output: Contribution to journal › Article › Scientific › peer-review

1 Citation (Scopus)

84 Downloads (Pure)

Abstract

An investigation on non-equilibrium condensing steam flow is conducted to attain a semi-analytical model for the prediction of the Wilson point up to the critical point. The database for the analysis includes experimental observations in various nozzles and conditions (ranging from 20 to 150 bar) taken from the literature as well as additional data at lower and higher reduced pressures, generated by means of a calibrated quasi-1D model based on the method of moments.

The simplified model is based on a reformulation of the Wilson point in terms of activation time, defined as the temporal interval between the instant at which the flow is at saturation conditions and the inception stable of condensation. This allows to incorporate the dependency of the Wilson point on the cooling rate and dew-point temperature, which are found the key parameters affecting the delay of condensation.

The accuracy of the approach is proved by predicting the degree of subcooling on four different test cases, with deviations against experiments in the range of 1−10%. As demonstrated, the same approach can be exploited to design nozzles free of condensation.

Original language	English
Pages (from-to)	1-14
Journal	International Journal of Heat and Fluid Flow
Volume	70
DOIs	https://doi.org/10.1016/j.ijheatfluidflow.2018.01.004
Publication status	Published - 2018

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

Non-equilibrium condensation
Supersonic nozzles
steam expansion
Wilson point

Access to Document

10.1016/j.ijheatfluidflow.2018.01.004

1-s2.0-S0142727X1730471X-mainFinal published version, 1.6 MB

Cite this

@article{131755e76fee400180bf3a2767dc0f20,

title = "Semi-analytical model for the prediction of the Wilson point for homogeneously condensing steam flows",

abstract = "An investigation on non-equilibrium condensing steam flow is conducted to attain a semi-analytical model for the prediction of the Wilson point up to the critical point. The database for the analysis includes experimental observations in various nozzles and conditions (ranging from 20 to 150 bar) taken from the literature as well as additional data at lower and higher reduced pressures, generated by means of a calibrated quasi-1D model based on the method of moments.The simplified model is based on a reformulation of the Wilson point in terms of activation time, defined as the temporal interval between the instant at which the flow is at saturation conditions and the inception stable of condensation. This allows to incorporate the dependency of the Wilson point on the cooling rate and dew-point temperature, which are found the key parameters affecting the delay of condensation.The accuracy of the approach is proved by predicting the degree of subcooling on four different test cases, with deviations against experiments in the range of 1−10%. As demonstrated, the same approach can be exploited to design nozzles free of condensation.",

keywords = "Non-equilibrium condensation, Supersonic nozzles, steam expansion, Wilson point",

author = "Lucia Azzini and Matteo Pini and Piero Colonna",

note = "Green Open Access added to TU Delft Institutional Repository {\textquoteleft}You share, we take care!{\textquoteright} – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. ",

year = "2018",

doi = "10.1016/j.ijheatfluidflow.2018.01.004",

language = "English",

volume = "70",

pages = "1--14",

journal = "International Journal of Heat and Fluid Flow",

issn = "0142-727X",

publisher = "Elsevier",

}

TY - JOUR

T1 - Semi-analytical model for the prediction of the Wilson point for homogeneously condensing steam flows

AU - Azzini, Lucia

AU - Pini, Matteo

AU - Colonna, Piero

N1 - Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

PY - 2018

Y1 - 2018

N2 - An investigation on non-equilibrium condensing steam flow is conducted to attain a semi-analytical model for the prediction of the Wilson point up to the critical point. The database for the analysis includes experimental observations in various nozzles and conditions (ranging from 20 to 150 bar) taken from the literature as well as additional data at lower and higher reduced pressures, generated by means of a calibrated quasi-1D model based on the method of moments.The simplified model is based on a reformulation of the Wilson point in terms of activation time, defined as the temporal interval between the instant at which the flow is at saturation conditions and the inception stable of condensation. This allows to incorporate the dependency of the Wilson point on the cooling rate and dew-point temperature, which are found the key parameters affecting the delay of condensation.The accuracy of the approach is proved by predicting the degree of subcooling on four different test cases, with deviations against experiments in the range of 1−10%. As demonstrated, the same approach can be exploited to design nozzles free of condensation.

AB - An investigation on non-equilibrium condensing steam flow is conducted to attain a semi-analytical model for the prediction of the Wilson point up to the critical point. The database for the analysis includes experimental observations in various nozzles and conditions (ranging from 20 to 150 bar) taken from the literature as well as additional data at lower and higher reduced pressures, generated by means of a calibrated quasi-1D model based on the method of moments.The simplified model is based on a reformulation of the Wilson point in terms of activation time, defined as the temporal interval between the instant at which the flow is at saturation conditions and the inception stable of condensation. This allows to incorporate the dependency of the Wilson point on the cooling rate and dew-point temperature, which are found the key parameters affecting the delay of condensation.The accuracy of the approach is proved by predicting the degree of subcooling on four different test cases, with deviations against experiments in the range of 1−10%. As demonstrated, the same approach can be exploited to design nozzles free of condensation.

KW - Non-equilibrium condensation

KW - Supersonic nozzles

KW - steam expansion

KW - Wilson point

UR - http://resolver.tudelft.nl/uuid:131755e7-6fee-4001-80bf-3a2767dc0f20

U2 - 10.1016/j.ijheatfluidflow.2018.01.004

DO - 10.1016/j.ijheatfluidflow.2018.01.004

M3 - Article

SN - 0142-727X

VL - 70

SP - 1

EP - 14

JO - International Journal of Heat and Fluid Flow

JF - International Journal of Heat and Fluid Flow

ER -

Semi-analytical model for the prediction of the Wilson point for homogeneously condensing steam flows

Abstract

Bibliographical note

Keywords

Access to Document

Other files and links

Fingerprint

Cite this