E214 SLUG FLOODING IN AIR-WATER COUNTERCURRENT VERTICAL FLOW(Evaporation-2 and others)

概要

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This paper is to study slug flooding in the vertical air-water countercurrent flow loop with a porous liquid injector in the upper plenum. More water penetration into the bottom plenum in slug flooding is observed than the annular flooding because the flow regime changes from the slug flow regime or periodic slug/annular flow regime to annular flow regime due to the hysteresis between the onset of flooding and the bridging film. Experiments were made tubes of 0.995 cm , 2.07 cm , and 5.08cm in diameter. A mechanistic model for the slug flooding with the solitary wave whose height is four time of the mean film thickness is developed to produce relations of the critical liquid flow rate and the mean film thickness. After fitting the ciritical liquid flow rate with the experimental data as a function of the Bond number, the gas flow rate for the slug flooding is obtained by substituting the critical liquid flow rate to the annualr flooding criteria. The present experimental data evaluate the slug flooding condition developed here by sustituting the correlations for mean film thickness models in the literature. The best prediction was made by the correaltion for the mean film thickness of the present study which is same as Feind's correaltion multiplied by 1.35.
一般社団法人日本機械学会の論文
2000-10-01