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2 edition of Calculation of steam volume fraction in subcooled boiling found in the catalog.

Calculation of steam volume fraction in subcooled boiling

S. Zia Rouhani

Calculation of steam volume fraction in subcooled boiling

by S. Zia Rouhani

  • 11 Want to read
  • 14 Currently reading

Published by Aktiebolaget Atomenergi in Stockholm .
Written in English

    Subjects:
  • Ebullition.

  • Edition Notes

    Bibliography: p. 22-23.

    Statement[by] S. Z. Rouhani.
    SeriesAtomenergi, Aktiebolaget. AE-, 286, AE (Series) (Stockholm, Sweden) ;, 286.
    Classifications
    LC ClassificationsTK9008 .A77 no. 286
    The Physical Object
    Pagination24 p.
    Number of Pages24
    ID Numbers
    Open LibraryOL4956674M
    LC Control Number76395573

    Saturated and Subcooled Liquids. If a substance exists as a liquid at the saturation temperature and pressure, it is called a saturated the temperature of the liquid is lower than the saturation temperature for the existing pressure,it is called either a subcooled liquid (implying that the temperature is lower than the saturation temperature for the given pressure) or a . Online calculator with Superheated Steam Table. Includes 53 different calculations. Equations displayed for easy reference.

    For horizontal flow boiling, the factor converted the centre-line scanning void fraction to the mean void fraction on the section within % of difference. For vertical (upwards) flow boiling, it was also found that the factor could convert quite well the centre-line chordal scanning of the void fraction to the mean void fraction. Journal of the Brazilian Society of Mechanical Sciences and Engineering Rouhani, S.Z. and Axelsson, E., , "Calculation of void volume fraction in the subcooled and quality boiling regions", Int. J. Heat Mass Transfer, Vol.

    One such scheme is the simple addition of the nucleate boiling and liquid convective heat fluxes, which seems to work reasonably well for large nucleate boiling fluxes at large liquid subcooling [e.g., del Valle and Kenning ()], although the nucleate boiling flux depends on the subcooling. Thermodynamics CHANGE OF PHASE Figure 4 Piston-cylinder Arrangement Saturation Figure 5 Vapor Pressure Curve The term saturation defines a condition in which a mixture of vapor and liquid can exist together at a given temperature and pressure. The temperature at which vaporization (boiling) starts to occur for a given pressure is called the saturation temperature .


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Calculation of steam volume fraction in subcooled boiling by S. Zia Rouhani Download PDF EPUB FB2

CALCULATION OF VOID VOLUME FRACTION IN THE SUBCOOLED AND QUALITY BOILING REGIONS S. Rouhani and E. Axelsson SUMMARY The complex problem of void calculation in the different regions of flow boiling is divided in two parts.

The first part includes only the description of the mechanisms. @article{osti_, title = {CALCULATION OF VOID VOLUME FRACTION IN THE SUBCOOLED AND QUALITY BOILING REGIONS.}, author = {Rouhani, S Z and Axelsson, E}, abstractNote = {}, doi = {/(70)}, journal = {Int.

Heat Mass Transfer (Feb ).}, number =, volume =, place = {United Kingdom}, year = {Thu Jan 01. Calculation of steam volume fraction in subcooled boiling (Atomenergi, Aktiebolaget. AE-) [Rouhani, S.

Zia] on *FREE* shipping on qualifying offers. Calculation of steam volume fraction in subcooled boiling (Atomenergi, Aktiebolaget. AE-)Author: S. Zia Rouhani. Condensation of vapor in the subcooled liquid is analyzed and the relative velocity of vapor with respect to the liquid is neglected in these regions.

The theoretical arguments result in some equations for the calculation of steam volume fraction and true liquid by: However, it seems to agree quite well with the properties of water and heavy water for pressures from 19 to atm.

REFERENCES 1. S.Z. ROUHANI, Calculation of steam volume fraction in subcooled boiling, J. Heat Trans (). GRIFFITH, I. CLARK and W. ROHSENOW, Void volumes in subcooled boiling systems, ASME HT Cited by: Subcooled Boiling in PWRs. Although the earliest core designs assumed that subcooled surface boiling could not be allowed in PWRs, this assumption was soon rejected and two-phase heat transfer is now one of normal operation heat transfer mechanisms also in PWRs at normal operation, there is a compressed liquid water inside the reactor core, loops and steam.

Rouhani, S.Z., and Axelsson, E. CALCULATION OF VOID VOLUME FRACTION IN THE SUBCOOLED AND QUALITY BOILING y unknown/Code not available: N. p. Rouhani, S. and Axelsson, E. “Calculation of void volume fraction in the subcooled and quality boiling regions.” Int.

Hea and Mass Transfer 13 () – CrossRef Google ScholarAuthor: H. Michel, G. Bartsch. Unfortunately, you cannot determine the steam content with the given information alone. I think you were hinting at the concept of partial pressures with the calculation you showed.

Unfortunately, you don't know the partial pressure or the mass fraction of the steam, so this doesn't help much either. Detection of subcooled boiling in a PWR using noise analysis and calculation of the steam void fraction /97 $ + DETECTION OF "COOLED BOILING IN A PWR USING NOISE ANALYSIS AND CALCULATION OF THE STEAM VOID FRACTION E.

LAGGIARD and J. RUNKEL University of Hannover Institute of Nuclear Engineering and Nondestructive Testing Cited by: 4. Bubble behavior and mean bubble diameter in subcooled upward flow boiling in a vertical annular channel were investigated under low pressure and mass flux conditions.

A high-speed video system was used to visualize the subcooled flow boiling by: For subcooled flow boiling in narrow tubes of 1 mm inside diameter, the void fraction was estimated to be several ten percent smaller than that predicted by the subcooled void fraction.

The saturation vapor curve is the curve separating the two-phase state and the superheated vapor state in the T-s diagram. The saturated liquid curve is the curve separating the subcooled liquid state and the two-phase state in the T-s diagram.; If a water exists as a liquid at the saturation temperature and pressure with quality of x = 0, it is called a saturated liquid state.

CFD for Subcooled Flow Boiling: Analysis of DEBORA T ests Journal of Computational Multiphase Flows To include the generation of vapour bubbles at.

The problem required the enthalpy of the water and so the book used the enthalpy of saturated water at 85°C from a steam table. Clearly, the water is subcooled because the temperature is well below °C, thus the enthalpy should intuitively not be.

Derivation of the equation of the dynamics of vapor void fraction in steam-generating channels during subcooled boiling. Plyutinskii & L. Fishgoit Soviet Atomic Energy vol pages – ()Cite this articleCited by: 2.

The conservation of mass for phase is: (1) where α k is volume fraction of phase k, ρ k is phase density, u k is phase velocity, m ki and m ik are mass transfer rates to and from the phase, and N is the total number of phases. The sum of the volume fractions is clearly equal to unity. In chemistry, the volume fraction φ i is defined as the volume of a constituent V i divided by the volume of all constituents of the mixture V prior to mixing: = ∑ Being dimensionless, its unit is 1; it is expressed as a number, e.g., It is the same concept as volume percent (vol%) except that the latter is expressed with a denominator ofe.g., 18%.

Boiling of a liquid on a hot surface when the temperature of the liquid outside the layer adjacent to the surface is below its saturation temperature. Comment. Subcooled and saturated boiling can exist in both nucleate and film boiling.

Abstract—Bubble generation was observed using a high-speed camera in subcooled flow boiling at low void fraction. Constant heat flux was applied on one side of an upward rectangular channel to make heated test channel.

When using gas chemistry to estimate the initial steam fraction in boiling geothermal reservoirs from the gas content in steam of discharging wells various simplifying assumptions are made.

Thus, specific gas-gas or mineral-gas equilibria are always assumed. For example Giggenbach D’Amore and Celati () and.At the inlet, the liquid enters subcooled (at the lower temperature than saturation). In this region the flow is single-phase.

As the liquid heats up, the wall temperature correspondingly rises. As the wall temperature exceeds the saturation temperature (e.g. °C at .Zeitoun and Shoukri [] studied axial volume fraction profiles in low-pressure subcooled flow boiling using gamma attenuation techniques for different levels of mass flux, wall heat flux, and inlet predictions of the proposed model with respect to the distribution of the axial volume fraction in low-pressure subcooled flow boiling were in good agreement with the Cited by: