Experimental and theoretical studies on density wave instabilities in helically coiled tubes

Papini, Davide; Colombo, Marco; Cammi, Antonio; Ricotti, Marco Enrico

doi:10.1016/j.ijheatmasstransfer.2013.09.035

Cited by 38 publications

(4 citation statements)

References 43 publications

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“…It is well known that the RELAP5 code is usually considered for bestestimate transient simulation of thermal hydraulic phenomena relevant for light water reactor applications. The ability of RELAP5 to analyze DWO has been confirmed in many works of literature [3,16,17]. RELAP5 and STFQH have respective advantages to analyze DWO in H-OTSG.…”

Section: Comparisons Between Stfqh and Relap5mentioning

confidence: 81%

“…DWO is the most representative instability encountered in boiling systems. It is well known that DWO is induced in boiling system by the interaction between the single-phase flow and two-phase flow pressure drops, the inlet mass flow rate, and the void fraction distribution [3].…”

Section: Introductionmentioning

confidence: 99%

“…Zhou et al [9] and Ju et al [10] carried out experiments to study DWO in helically coiled tube steam generators. More recently, experimental and theoretical studies were performed by Papini et al [3] to investigate DWO in single and 2 Science and Technology of Nuclear Installations two parallel helically coiled tubes. Frequency domain method was employed to evaluate DWO in HTR-10 in the study of Niu et al [11].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Density Wave Oscillations in Helically Coiled Tube Once-Through Steam Generator

Hao

Zhang

Zheng

et al. 2016

Science and Technology of Nuclear Installations

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Helically coiled tube Once-Through Steam Generator (H-OTSG) is one of the key equipment types for small modular reactors. The flow instability of the secondary side of the H-OTSG is particularly serious, because the working condition is in the range of low and medium pressure. This paper presents research on density wave oscillations (DWO) in a typical countercurrent H-OTSG. Based on the steady-state calculation, the mathematical model of single-channel system was established, and the transfer function was derived. Using Nyquist stability criterion of the single variable, the stability cases were studied with an in-house computer program. According to the analyses, the impact law of the geometrical parameters to the system stability was obtained. RELAP5/MOD3.2 code was also used to simulate DWO in H-OTSG. The theoretical analyses of the in-house program were compared to the simulation results of RELAP5. A correction factor was introduced to reduce the error of RELAP5 when modeling helical geometry. The comparison results agreed well which showed that the correction is effective.

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Section: Comparisons Between Stfqh and Relap5mentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of Density Wave Oscillations in Helically Coiled Tube Once-Through Steam Generator

Hao

Zhang

Zheng

et al. 2016

Science and Technology of Nuclear Installations

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show abstract

“…2. In the sketch, two parallel tubes are included, since the same facility was adapted to study also two-phase instability phenomena in parallel tubes, as Density Wave Oscillations (DWOs) and Ledinegg instabilities (Papini et al, 2011(Papini et al, , 2014. For the measurement of the pressure drop, only one of the tubes was used, keeping closed the inlet valve of the second one (V2).…”

Section: The Experimental Analysismentioning

confidence: 99%