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Prediction of Critical Heat Flux for Subcooled Flow Boiling in Annulus and Transient Surface Temperature Change at CHF
| Content Provider | MDPI |
|---|---|
| Author | Liu, Wei |
| Copyright Year | 2022 |
| Description | The ability to predict critical heat flux (CHF) is of considerable interest for high-heat equipment, including nuclear reactors. CHF prediction from a mechanistic model for subcooled flow boiling in rod bundles still remains unsolved. In this paper, we try to predict the CHF in an annulus, which is the most basic flow geometry simplified from a fuel bundle, using a liquid sublayer dryout model. The prediction is validated with both water and R113 data, showing an accuracy within ±30%. After the CHF in an annulus is calculated successfully, a near-wall vapor–liquid structure is proposed on the basis of the liquid sublayer dryout model. Modeling of heat transfer modes over the heating surface at CHF is performed, and predictions of the changes in liquid sublayer thickness and heater surface temperature at the CHF occurrence point are carried out by solving the heat conduction equation in cylindrical coordinates with a convective boundary condition, which changes with the change in flow pattern over the heating surface. Transient changes in the liquid sublayer thickness and surface temperature at the CHF occurrence point are reported. |
| Starting Page | 230 |
| e-ISSN | 23115521 |
| DOI | 10.3390/fluids7070230 |
| Journal | Fluids |
| Issue Number | 7 |
| Volume Number | 7 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-07-07 |
| Access Restriction | Open |
| Subject Keyword | Fluids Critical Heat Flux (chf) Departure From Nucleate Boiling (dnb) Annulus Mechanistic Model Subcooled Flow Boiling Near-wall Vapor–liquid Structure Transient Liquid Sublayer Thickness Transient Surface Temperature |
| Content Type | Text |
| Resource Type | Article |
