2443 非定常サブチャネル解析コード NASCA の開発・改良 : (1) 開発状況

概要

論文の詳細を見る
This paper describes an overview of the NASCA code development program being aimed at improved capabilities of analyzing transient boiling two-phase flow phenomena, boiling transition (BT) and post BT phenomena in BWR rod bundles. Under the BWR operating conditions, we assume that BT on the rod surface can be explained by the liquid film dryout. Hence two-phase flows are described by the two-fluid three-field model. Major physical processes of significance are : 1) two-phase flow turbulent mixing and void drift that affect the void distribution in a bundle; 2) droplet entrainment and deposition phenomena including spacer effects on BT and post BT in a subchannel; 3) rewetting phenomena during the post BT. Mechanistic approaches to the physical modeling related to these phenomena are discussed and the basic framework and scope of the code development are outlined.
社団法人日本機械学会の論文
2000-07-31