Self-sustained hydrodynamic oscillations in a natural-circulation boiling water loop

Jain, K.C.; Petrick, M.; Miller, David; Bankoff, S. G.

doi:10.1016/0029-5493(66)90049-5

Cited by 22 publications

(2 citation statements)

References 3 publications

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“…Experimental investigations in two-phase natural circulation loops having single boiling heated channel have been carried out by [13,17,[24][25][26][27]. They observed density-wave instability in their experiments, which was found to increase with increase in channel exit restriction and inlet subcooling.…”

Section: Experimental Investigationsmentioning

confidence: 99%

Flow Instabilities in Boiling Two-Phase Natural Circulation Systems: A Review

Nayak

Vijayan

2008

Science and Technology of Nuclear Installations

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Several decades have been spent on the study of flow instabilities in boiling two-phase natural circulation systems. It is felt to have a review and summarize the state-of-the-art research carried out in this area, which would be quite useful to the design and safety of current and future light water reactors with natural circulation core cooling. With that purpose, a review of flow instabilities in boiling natural circulation systems has been carried out. An attempt has been made to classify the instabilities occurring in natural circulation systems similar to that in forced convection boiling systems. The mechanism of instabilities occurring in two-phase natural circulation systems have been explained based on these classifications. The characteristics of different instabilities as well as the effects of different operating and geometric parameters on them have been reviewed.

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Section: Experimental Investigationsmentioning

confidence: 99%

Flow Instabilities in Boiling Two-Phase Natural Circulation Systems: A Review

Nayak

Vijayan

2008

Science and Technology of Nuclear Installations

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“…Some other researchers studied the dynamic instabilities using water as a test fluid in a vertical test tube with natural circulation as an external characteristic. Jain et al (1966) discussed the effect of system geometry on the behavior of the DWOs. Delmastro and Clausse (1994) studied the phase trajectories and chaos analysis.…”

Section: Introductionmentioning

confidence: 99%

Operational Flexibility of Two-Phase Flow Test Rig for Investigating the Dynamic Instabilities in Tube Boiling Systems

et al. 2020

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The safe operation of a two-phase heat exchanger can be performed by determining the instability threshold values of power plant parameters. Thus, the power plant parameters must be designed outside these thresholds to avoid undesirable instability. The fluctuations in mass flow and system pressure are undesirable processes, resulting in system failure. In diverse heat transfer distribution, that can lead to burnout of heat exchanger tubes. Therefore, the maintaining of flow stability in a power plant is of particular relevance. The researchers and engineers can predict the threshold of flow instability with dynamic models validated with experimental records. The phenomenon of dynamic flow instabilities in two-phase flows is an important issue that has high relevance for many industries. The awareness about the triggers and the effects of fluid dynamic instabilities is of great importance in the design and operation of steam generators, refrigeration systems, thermosiphons or boiling water reactors. These instabilities manifest themselves in variations of mass flow, pressure, and fluid properties. In this work, the dynamic instabilities involved in evaporation processes were briefly discussed with simple models to understand the mechanism of its different types. Additionally, it is presented the design and construction of a two-phase flow test rig using the similarity and the scaling criteria. A heat recovery steam generator (HRSG) designed by Doosan Heavy Industries and Construction is scaled down to 4 × 4 × 2 m 3. The combination of the flow diagram and the thermohydraulic design is represented in three-dimension model of the test rig using the Siemens NX 10.0 software. The flexibility of operation was taken into account in the design of this test rig. Finally, we provided preliminary results to showcase some functionalities and the capability of the test rig to characterize the existing flow pattern through the evaporator and investigate the internal characteristic curve of the evaporator.

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