Numerical Study of Low-pressure Subcooled Flow Boiling in Vertical Channels Using the Heat Partitioning Model

- Journal title : Transactions of the Korean Society of Mechanical Engineers B
- Volume 40, Issue 7, 2016, pp.457-470
- Publisher : The Korean Society of Mechanical Engineers
- DOI : 10.3795/KSME-B.2016.40.7.457

Title & Authors

Numerical Study of Low-pressure Subcooled Flow Boiling in Vertical Channels Using the Heat Partitioning Model

Lee, Ba-Ro; Lee, Yeon-Gun;

Lee, Ba-Ro; Lee, Yeon-Gun;

Abstract

Most CFD codes, that mainly adopt the heat partitioning model as the wall boiling model, have shown low accuracies in predicting the two-phase flow parameters of subcooled boiling phenomena under low pressure conditions. In this study, a number of subcooled boiling experiments in vertical channels were analyzed using a thermal-hydraulic component code, CUPID. The prediction of the void fraction distribution using the CUPID code agreed well with experimental data at high-pressure conditions; whereas at low-pressure conditions, the predicted void fraction deviated considerably from measured ones. Sensitivity tests were performed on the submodels for major parameters in the heat partitioning model to find the optimized sets of empirical correlations suitable for low-pressure subcooled flow boiling. The effect of the K-factor on the void fraction distribution was also evaluated.

Keywords

Heat Partitioning Model;Low-pressure Subcooled Boiling;CUPID Code;K-factor;

Language

Korean

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