Bi-frontal debris bed quenching analysis using counter-current flow limitation conditions

KSME Journal ◽  
1988 ◽  
Vol 2 (2) ◽  
pp. 94-103 ◽  
Author(s):  
Kwang Won Lee ◽  
Soon Heung Chang
Keyword(s):  
Current Flow ◽  
Flow Limitation ◽  
Quenching Analysis ◽  
Counter Current Flow ◽  
Counter Current

Counter-current flow limitation for air-water and steam-water flows in a PWR hot leg geometry

2017 ◽  
Vol 323 ◽  
pp. 56-67 ◽  
Author(s):  
D. Lucas ◽  
M. Beyer ◽  
H. Pietruske ◽  
L. Szalinski
Keyword(s):  
Current Flow ◽  
Flow Limitation ◽  
Water Flows ◽  
Counter Current Flow ◽  
Counter Current

Experimental Study on Counter Current Flow Limitation Based on Variation of Gap Size in Narrow Rectangular Channel during Quenching Process

2014 ◽  
Vol 590 ◽  
pp. 613-617
Author(s):  
Mulya Juarsa ◽  
Nandy Putra ◽  
Harinaldi ◽  
Anhar Riza Antariksawan
Keyword(s):  
Current Flow ◽  
Rectangular Channel ◽  
Cooling Water ◽  
Superficial Velocity ◽  
Gap Size ◽  
Flow Limitation ◽  
Narrow Channels ◽  
Quenching Process ◽  
Counter Current Flow ◽  
Counter Current

The Effect of gap size to counter current flow limitation (CCFL) in vertical rectangular channel was studied in this paper. Experiment was conducted by using two vertical plate with 1 mm, 2 mm, and 3 mm narrow gap. The initial temperature of plate was decided at 600oC. Flow rate and temperature of cooling water were controlled about 0.09 L/s and 90oC respectively. Non-dimensional superficial velocity for water is 0.05-0.09 and non-dimensional superficial velocity for vapor is 3.20-3.2. The result shows that the existence of CCFL in the vertical rectangular narrow channels. A new correlation for CCFL base on Wallis has been proposed.

Air/Water Counter-Current Flow Experiments in a Model of the Hot Leg of a Pressurized Water Reactor

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
Christophe Vallée ◽  
Deendarlianto ◽  
Matthias Beyer ◽  
Dirk Lucas ◽  
Helmar Carl
Keyword(s):  
Steam Generator ◽  
Pressure Vessel ◽  
Test Section ◽  
Current Flow ◽  
Flow Limitation ◽  
Two Phase ◽  
Pressurized Water ◽  
Counter Current Flow ◽  
Counter Current ◽  
Inlet Chamber

Different scenarios of small break loss of coolant accident for pressurized water reactors (PWRs) lead to the reflux-condenser mode in which steam enters the hot leg from the reactor pressure vessel (RPV) and condenses in the steam generator. A limitation of the condensate backflow toward the RPV by the steam flowing in counter current could affect the core cooling and must be prevented. The simulation of counter-current flow limitation conditions, which is dominated by 3D effects, requires the use of a computational fluid dynamics (CFD) approach. These numerical methods are not yet mature, so dedicated experimental data are needed for validation purposes. In order to investigate the two-phase flow behavior in a complex reactor-typical geometry and to supply suitable data for CFD code validation, the “hot leg model” was built at Forschungszentrum Dresden-Rossendorf (FZD). This setup is devoted to optical measurement techniques, and therefore, a flat test-section design was chosen with a width of 50 mm. The test section outlines represent the hot leg of a German Konvoi PWR at a scale of 1:3 (i.e., 250 mm channel height). The test section is mounted between two separators, one simulating the RPV and the other is connected to the steam generator inlet chamber. The hot leg model is operated under pressure equilibrium in the pressure vessel of the TOPFLOW facility of FZD. The air/water experiments presented in this article focus on the flow structure observed in the region of the riser and of the steam generator inlet chamber at room temperature and pressures up to 3 bar. The performed high-speed observations show the evolution of the stratified interface and the distribution of the two-phase mixture (droplets and bubbles). The counter-current flow limitation was quantified using the variation in the water levels measured in the separators. A confrontation with the images indicates that the initiation of flooding coincides with the reversal of the flow in the horizontal part of the hot leg. Afterward, bigger waves are generated, which develop to slugs. Furthermore, the flooding points obtained from the experiments were compared with empirical correlations available in literature. A good overall agreement was obtained, while the zero penetration was found at lower values of the gaseous Wallis parameter compared with previous work. This deviation can be attributed to the rectangular cross section of the hot leg model.

Sensitivity study on the counter-current flow limitation in the DEG LBLOCA with the TRACE code

2013 ◽  
Vol 57 ◽  
pp. 121-129 ◽  
Author(s):  
Chun-Yu Chen ◽  
Chunkuan Shih ◽  
Jong-Rong Wang ◽  
Hao-Tzu Lin
Keyword(s):  
Current Flow ◽  
Sensitivity Study ◽  
Flow Limitation ◽  
Counter Current Flow ◽  
Counter Current
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