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Главная Архив Thermal Letter Оргкомитет Будущие конференции AIHTC
International Heat Transfer Conference 9

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

COUNTERCURRENT FLOW LIMITATION IN VERTICAL DUCTS AT HIGH SYSTEM PRESSURES

M. Stephan
Lehrstuhl A fur Thermodynamic Technische Universitat Munchen, ERG

Franz Mayinger
Lehrstuhl A für Thermodynamik, Technische Universität München, München, Germany; Technical University, Hannover, FRG Institut fur Verfahrenstechnik

DOI: 10.1615/IHTC9.4330
pages 47-52

Аннотация

An experimental and analytical study on adiabatic countercurrent flow limitation (flooding) in single vertical ducts is reported. Experimental results on flooding curves, pressure drop and void fraction obtained with Freon 12 liquid and vapour in a rectangular channel are presented. The data were obtained under steady-state conditions, at various critical pressure ratios (0.16-0.31) and liquid injection flow rates, and alternatively using two different liquid feed locations. No substantial effect of the liquid injection location and flow rate on the liquid delivery (flooding) curves and on the pressure drop during flooding was found. The pressure drop data obtained at different elevations were essentially the same. Void fraction profiles evaluated from optical fiber probe data indicate an annular-type flow pattern. Based on this experimental evidence a mechanistic flow model is developed. The results are compared to the present high pressure and a number of comparable low pressure data sets, showing reasonable predictions of not only the flooding curves, but also the pressure drop during flooding.

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