Existing DNB-type CHF mechanistic models and relations with visualized experiments in forced convective flow boiling: A review. (June 2022)

• Record Type: Journal Article
• Authors: Liu, Yang; Liu, Wei; Gu, Long; Shan, Jianqiang; Zhang, Lu; Su, Xingkang
• Is Part Of: Progress in nuclear energy. Volume 148(2022)
• Publication Date: 2022-06
• Subjects: CHF -- DNB -- Visualized experiment -- Mechanistic model -- Trigger mechanism -- Bubble behavior -- Grid -- PWRs; Nuclear energy -- Periodicals; Nuclear engineering -- Periodicals; 333.7924
• DOI: 10.1016/j.pnucene.2022.104225
• Languages: English
• ISSNs: 0149-1970

Abstract

Abstract: This paper reviews in detail the existing visualized experiments and mechanistic models of DNB-type CHF in forced convective flow boiling. And summarizes and reviews the existing CHF mechanistic models from the perspective of whether the NVG (Net Vapor Generation) point is established or not, from both the micro and macro aspects, and the relationship between the visualized phenomenon and the CHF models has been explained. In addition, a visualized experiment within the geometry and parameters of the PWRs was launched with R-134a fluid to explore the similarities and differences between the existing visualized phenomena under tube, annulus, and rectangular channels, especially in the influence of grid. Finally, the possible development direction of the DNB-type CHF mechanistic model and the problems to be solved are clarified. Highlights: The existing DNB-type CHF mechanistic models in flow boiling were summarized and commented in detail. The relationship between the mechanistic models and visualization phenomenon was explained. The influence of geometry under PWRs, especially grid, on visualization was described. The development direction of CHF mechanistic model that needs to be focused on was pointed out.