Non-linear effects in a natural circulation evaporator: geysering coupled with manometer oscillations

Baars, Albert; Delgado, Antonio

doi:10.1007/s00231-005-0069-3

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…Geysering coupled with manometer oscillations had been identified experimentally in evaporators. 15 On the basis of experiments with cryogenic fluids, Kuncoro et al 16 concluded that liquid superheating was the driving force for vapor expulsion and pressure surge during geysering. A survey of the literature reported above indicates that the oscillations of liquid temperatures, loop flow rate, void fraction and static pressure, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Geysering can also be found in the storage of cryogenic fluids, natural circulation evaporators, and distillation columns. Geysering coupled with manometer oscillations had been identified experimentally in evaporators . On the basis of experiments with cryogenic fluids, Kuncoro et al concluded that liquid superheating was the driving force for vapor expulsion and pressure surge during geysering.…”

Section: Introductionmentioning

confidence: 99%

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Validations of Thermohydraulic Models for Geysering in a Natural Circulation Loop Using an Impedance Needle Probe

Paruya

Saha

Bhattacharya

2008

Ind. Eng. Chem. Res.

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This paper describes the validations of thermohydraulic models that predict the geysering instability observed at the riser section of a short-tube natural circulation evaporator (STNCE) at low heat flux and low pressure. The validations have been made by measuring the void fraction in the steam-water system at the riser section of a STNCE with the help of an impedance void-needle probe. The calibration of the probe shows that in the range of low void fractions the probe indicates lower values while in the range of high void fractions it indicates higher values compared to those measured by the manometer. Measured data of void fraction have been analyzed by thermohydraulic models. Both measured data and simulated data of temporal variation of void fractions during geysering have been observed to be periodic pulses of high amplitudes. Effects of riser height and loop resistance on the geysering frequency have been demonstrated in detail. The paper also discusses both the measurement uncertainties and the model uncertainties.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%