Experimental investigation on the flow instability behavior of a multi-channel boiling natural circulation loop at low-pressures

Jain, Vikas; Nayak, Arun K.; Vijayan, P.K.; Saha, Dilip; Sinha, R.K.

doi:10.1016/j.expthermflusci.2010.01.007

Cited by 49 publications

(11 citation statements)

References 17 publications

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“…Earlier, the persistence of out-of-phase oscillations even under equal power condition between channels was reported through experimental studies by Subki et al [5] and Chen et al [15]. Similar observation is reported by Jain et al [16] in their experiments conducted in a natural circulation parallel-channel model; they also characterized such oscillations as mixed mode oscillation. Figure 4(b) shows that the flow in NCBWR is characterized by flashing pulses which are in-phase between Channel-1 and Channel-2, with no flow reversal.…”

Section: Channels With Equalsupporting

confidence: 73%

Numerical Investigation of Startup Instabilities in Parallel-Channel Natural Circulation Boiling Systems

Lakshmanan

Pandey

2010

Science and Technology of Nuclear Installations

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The behaviour of a parallel-channel natural circulation boiling water reactor under a low-pressure low-power startup condition has been studied numerically (using RELAP5) and compared with its scaled model. The parallel-channel RELAP5 model is an extension of a single-channel model developed and validated with experimental results. Existence of in-phase and out-of-phase flashing instabilities in the parallel-channel systems is investigated through simulations under equal and unequal power boundary conditions in the channels. The effect of flow resistance on Type-I oscillations is explored. For nonidentical condition in the channels, the flow fluctuations in the parallel-channel systems are found to be out-of-phase.

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Section: Channels With Equalsupporting

confidence: 73%

Numerical Investigation of Startup Instabilities in Parallel-Channel Natural Circulation Boiling Systems

Lakshmanan

Pandey

2010

Science and Technology of Nuclear Installations

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“…Durga Prasad et al (2008a) also illustrated that two even-power channels presented out-of-phase oscillation in the type-I region but might oscillate in-phase or out-of-phase in the type-II region under different operating settings. A recent experimental investigation was performed in a multi-channel natural circulation loop at low pressures (Jain et al, 2010). Type-I and type-II instabilities were observed by their experimental results.…”

Section: Nomenclaturementioning

confidence: 97%

Nonlinear dynamic analysis of a two-phase natural circulation loop with multiple nuclear-coupled boiling channels

Lee

Pan

Chen

2015

Annals of Nuclear Energy

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“…For simplicity, natural circulation can be defined as the process of heat removal by the reactor cooling system without the need for a pump [3]. This passive heat removal mechanism can be implemented in both normal operation condition and in accident conditions [4].…”

Section: Introduction mentioning

confidence: 99%

Preliminary Study on Mass Flow Rate in Passive Cooling Experimental Simulation During Transient Using NC-Queen Apparatus

et al. 2015

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The research related to thermal management has been significantly inreased, especially for NPP safety. The use of passive cooling systems both during the accident and operation become reliable in the advanced reactor safety systems. Therefore it should be enhanced through experimental studies to investigate heat transfer phenomenon of the heat decay in transient cooling condition. An investigation has been performed through experiment using an NC-Queen apparatus constructed with rectangular loop. Piping were consisting of tubes of SS316L with diameter, length, and width of 3/4 inch, 2.7 m, and 0.5 m respectively. The height between heater and cooler was 1.4 m. The experiment used initial water temperature at 70 o C, 80 o C, and 90 o C in heater area. Transient temperature was used as experimental data to calculate water mass flow rate. The results showed that the temperature in heater area and cooler area were decreasing of about 90.6% and 95.7% at initial temperatur of 80 o C, and of about 71.1% and 59.4% at initial temperature of 70 o C. Those results were at higher initial temperature of 90 o C compared with the initial temperature of 90 o C. The average of water mass flow rate increased 81.03% from initial temperatur of 70 o C. It was shown that the averages of removed heat in every second from water due to heat loss and cooler, were 3.51 watts, 5.06 watts and 6.85 watts respectively. The initial condition of heat stored in the water was quite different, but to the cooler heat removal capacity and heat loss was almost the same.

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Experimental investigation on the flow instability behavior of a multi-channel boiling natural circulation loop at low-pressures

Cited by 49 publications

References 17 publications

Numerical Investigation of Startup Instabilities in Parallel-Channel Natural Circulation Boiling Systems

Numerical Investigation of Startup Instabilities in Parallel-Channel Natural Circulation Boiling Systems

Nonlinear dynamic analysis of a two-phase natural circulation loop with multiple nuclear-coupled boiling channels

Preliminary Study on Mass Flow Rate in Passive Cooling Experimental Simulation During Transient Using NC-Queen Apparatus

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