垂直流路における比較的低流速の飽和二相上昇流の限界熱流束

概要

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A quantitative analysis of critical heat flux (CHF) in both vertical circular tubes and rectangular channels under about 0.1 to 14 MPa was successfully carried out by application of the completely separated two-phase flow model to the comparatively low-velocity, upward-saturated two-phase flow, based on existing model of vapor blanket over the thin liquid sublayer on the heated walls at the CHF point, which was originally proposed by Haramura and Katto [Int. J. Heat Mass Transfer, 26-3 (1983), 389-399]. Over 1000 experimental CHF data were compared with analytical results and it was clarified that the analytical results gave good predictions of the existing experimental results of circular tubes of 3.0 to 7.8 mm in diameter and 0.15 to 0.6 m in length at 0 to 300 K and rectangular channels of 1.03 to 12.7 mm in channel gap and 0.15 to 0.94 min channel length at 4 to 328 K of inlet subcooling. The differences in characteristics of CHF between circular tubes and rectangular channels in upward-saturated two-phase How were also identified.
社団法人日本機械学会の論文
1995-02-25