Visualization experiments on the geyser boiling-induced instability in vertical circular tube at low-pressures

Tong, Lili; Chen, Jinbo; Cao, Xinde; Yang, S.L.; Liao, Shiliang; Deng, Jian

doi:10.1016/j.anucene.2014.12.003

Cited by 16 publications

(4 citation statements)

References 16 publications

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“…The upper unheated reservoir has larger subcooling even at the maximum temperatures, thereby condensing the bubbles or vapor formed in the bottom region. Kuncoro et al [28] pointed out that the temperature distribution or axil temperature gradient in the flow channel was dependent on the system pressure, and the effect of system pressure on the axial temperature distributions was described in our associated reference [37]. Fig.…”

Section: Effect Of Heat Flux (Q In )mentioning

confidence: 97%

Experimental investigation of effective parameters on geyser periodicity in a vertical heated system

Chen

Yang

Liao

et al. 2015

Experimental Thermal and Fluid Science

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Section: Effect Of Heat Flux (Q In )mentioning

confidence: 97%

Experimental investigation of effective parameters on geyser periodicity in a vertical heated system

Chen

Yang

Liao

et al. 2015

Experimental Thermal and Fluid Science

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“…It was observed that, when intermittent boiling occurs, additional unstable and dynamic behavior occurs, accompanied by a hammering sound. If a heated body of water is deep or if there is a sufficiently large difference in the hydrostatic head between the water surface and the floor, geyser boiling [34][35][36][37] can occur. The geyser boiling phenomenon and the expected axial hydrostatic head distribution in the FHP are illustrated in Figure 15.…”

Section: Instantaneous Operation Characteristicsmentioning

confidence: 99%

Experimental Investigation of the Heat Transfer Characteristics and Operation Limits of a Fork-Type Heat Pipe for Passive Cooling of a Spent Fuel Pool

2021

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A fork-type heat pipe (FHP) is a passive heat-transport and air-cooling device used to remove the decay heat of spent nuclear fuels stored in a liquid pool during a station blackout. FHPs have a unique geometrical design to resolve the significant mismatch between the convective heat transfer coefficients of the evaporator and condenser parts. The evaporator at the bottom is a single heat-exchanger tube, whereas the condenser at the top consists of multiple finned tubes to maximize the heat transfer area. In this study, the heat transfer characteristics and operating limits of an FHP device were investigated experimentally. A laboratory-scale model of an FHP was manufactured, and a series of tests were conducted while the temperature was varied to simulate a spent fuel pool. As an index of the average heat transfer performance, the loop conductance was computed from the measurement data. The results show that the loop conductance of the FHP increased with the heat transfer rate but deteriorated significantly at the operating limit. The maximum attainable heat transfer rate of the unit FHP model was accurately predicted by the existing correlations of the counter-current flow limit for a single-rod-type heat pipe. In addition, the instant heat transfer behaviors of the FHP model under different temperature conditions were examined to interpret the measured loop conductance variation and operating limit.

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“…The application of two-phase (liquid and vapor) thermosiphon is generally wider. It is also used in nuclear systems [24] but in addition, it can be used in the cooling of super-conductors [24], thermal diodes [25], gas turbines [26] or in electronics cooling [16], latent heat thermal storage systems [27], household refrigerator applications [28] and as distillation column reboilers [29]. Reverse two-phase thermosiphons have great potential to operate in solar installations [30] (heat source situated above the heat sink) but due to technical imperfections, these devices have not yet found a wide practical application.…”

Section: Introductionmentioning

confidence: 99%

Flow Boiling in Minigap in the Reversed Two-Phase Thermosiphon Loop

2019

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The paper presents the results of experimental investigations of a model of a heat exchanger featuring a minigap, which is perceived as an evaporator for an inverted thermosiphon. The system works with a single component test fluid. The tested evaporator generates pumping power in the test loop in a way similar to the mammoth pump. The tests regarded a module of the heat exchanger, consisting of a hot leg and a cold leg with the width by the length of 0.1 × 0.2 m, heated by a uniform heat flux. In the tests, the minigaps of 1, 2 and 3 mm were formed. Two fluids, namely, distilled water and ethanol, were tested in the facility. Two-phase flow structures for both working fluids and various operational parameters, together with comprehensive visualization material, are presented. The specifics of pressure changes and its influence on operating parameters and flow structure are discussed.

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Visualization experiments on the geyser boiling-induced instability in vertical circular tube at low-pressures

Cited by 16 publications

References 16 publications

Experimental investigation of effective parameters on geyser periodicity in a vertical heated system

Experimental investigation of effective parameters on geyser periodicity in a vertical heated system

Experimental Investigation of the Heat Transfer Characteristics and Operation Limits of a Fork-Type Heat Pipe for Passive Cooling of a Spent Fuel Pool

Flow Boiling in Minigap in the Reversed Two-Phase Thermosiphon Loop

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