Lecture Notes on Heat Extraction From Boiling Water Power Reactors

Lottes, P.A.; Petrick, M.; Marchaterre, J.F.

doi:10.2172/4208113

Cited by 9 publications

(8 citation statements)

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“…The influence of mass velocity G on the multiplier R was also investigated. Figure 5 shows also the prediction of the R multiplier according to well-known formulas of Lottes [10] and Levy [11]: Figures 5 and 6 show average values of R evaluated from the experiments. It is seen that R is decreasing when the mass velocity increases.…”

Section: Validation Of the Proposed Methodsmentioning

confidence: 99%

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Generalization of Martinelli-Nelson method of pressure drop calculation in two-phase flows

2017

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Abstract.A simple method of pressure drop calculation for two-phase flows of different fluids during convective boiling in channels is presented. It is based on experimental data of pressure drop multiplier R and void fraction ϕ obtained by Martinelli and Nelson for boiling of water in vertical tubes. The data cover the whole two-phase domain from ambient to critical pressure. Unfortunately, they have been presented in graphical forms. The first step in the procedure proposed in the paper was a transformation of the graphical data into analytical formulas which contain such dimensionless quantities as steam quality x, Martinelli parameter X, multiplier Φl 2 and dimensionless coefficients D, m, E and k. In the second step, simple analytical formulas were determined to express the dimensionless coefficients as a function of physical property parameter K. In this way two simple analytical expressions for the multiplier R and void fraction ϕ were obtained. They are in analytical dimensionless form so they may be used directly for different fluids, not only for water. This is the main advantage of the proposed method.

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Section: Validation Of the Proposed Methodsmentioning

confidence: 99%

“…For high pressure and diabatic (with heat addition, e.g. at boiling) flows, the use of LM correlation (10) leads to large errors. Therefore the attempt was made by one of the present authors [6], to obtain analytical formulas for two-phase multiplier R and void fraction ϕ.…”

Section: The Lockhart-martinelli Correlationmentioning

confidence: 99%

Generalization of Martinelli-Nelson method of pressure drop calculation in two-phase flows

2017

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“…The basis of this slip model is the introduction of a homogeneous and an effective specific mixture volume as defined by Lottes et al [6]. Here, this feature was deliberately adopted also for flashing flow.…”

Section: Generic Omega Parameter Modelsmentioning

confidence: 99%

Reproductive Accuracy of Generic Omega Parameter Safety Valve Two Phase Critical Mass Flow Models Based on Water and Refrigerant R‐134a Data

Friedel¹

2007

Chem Eng & Technol

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The modified Omega method included in ISO/FDIS 4126-10 provides the highest accuracy compared to other modified models frequently used in practice and academia. At the same time, it allows for an exceptionless oversizing of the necessary relief area under all test conditions. Nevertheless, the average or statistical reproductive accuracy is characterized by an unacceptably high logarithmic scatter of about 80 % for fluid dynamic critical steam/water and two-phase refrigerant R134a flow. When applying the method to sizing situations with predicted mass flow qualities in excess of 1 % an acceptably modest oversizing is maintained.

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“…(40) Combining (38), (39), and (40) (4) and (5). Specifically, the pressure drop is associated with a time, and that information will allow a determination of the density changes produced by the heat and mass transport at the liquid-vapor interface.…”

Section: Fanno Flowmentioning

confidence: 99%

Choking two-phase flow literature summary and idealized design solutions for hydrogen, nitrogen, oxygen, and refrigerants 12 and 11

Smith¹

1963

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Lecture Notes on Heat Extraction From Boiling Water Power Reactors

Cited by 9 publications

References 0 publications

Generalization of Martinelli-Nelson method of pressure drop calculation in two-phase flows

Generalization of Martinelli-Nelson method of pressure drop calculation in two-phase flows

Reproductive Accuracy of Generic Omega Parameter Safety Valve Two Phase Critical Mass Flow Models Based on Water and Refrigerant R‐134a Data

Choking two-phase flow literature summary and idealized design solutions for hydrogen, nitrogen, oxygen, and refrigerants 12 and 11

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