Dynamic Effects in Radiation Diagnosis of Fluctuating Voids

Harms, A. A.; Forrest, C. F.

doi:10.13182/nse71-a22377

Cited by 34 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If these fluctuations are themselves averaged by counting, rate meter, low-pass filter, or like methods, significant inaccuracies could result when converting the averaged signal back to the desired quantity of mean density or void fraction. These errors were recognized and analyzed by Jones, 60 * 61 Harms and Forrest, 39 Harms and Laratta. 40 Laratta and Harms.…”

Section: A What Can Be Measured By Radiation Attenuationmentioning

confidence: 99%

Summary on experimental methods for statistical transient analysis of two-phase gas-liquid flow. [BWR, PWR, and LMFBR]

Delhaye¹,

Jones²

1976

View full text Add to dashboard Cite

Separation of Steam and Water Distributions According to Stefanovic et al 13 2. Separation of Steam and Water Distributions According to Barois. 14 3. Subcooled Boiling-temperature Histograms 15 4. Different Hypotheses Concerning the Separation of Liquid and Steam Histograms 16 5. Most Probable Liquid Temperature and Void Fraction above a Nucleus in Nucleate Boiling 17 6. Glass-rod Optical Probe 18

show abstract

Section: A What Can Be Measured By Radiation Attenuationmentioning

confidence: 99%

Summary on experimental methods for statistical transient analysis of two-phase gas-liquid flow. [BWR, PWR, and LMFBR]

Delhaye¹,

Jones²

1976

View full text Add to dashboard Cite

show abstract

“…Investigations by [24] and [27] revealed that there are problems associated with inaccuracies in obtaining void fraction measurements owing to fluctuations.…”

Section: Introductionmentioning

confidence: 99%

Detailed analysis of phase distributions in a vertical riser using wire mesh sensor (WMS)

Abdulkadir

Hernández-Pérez

Lowndes

et al. 2014

Experimental Thermal and Fluid Science

View full text Add to dashboard Cite

This paper looks into the results of an experimental study concerned with the phase distributions of gas-liquid multiphase flows experienced in a vertical riser. Scale experiments were carried out using a mixture of air and silicone oil in a 6 m long riser pipe with an internal diameter pipe of 67 mm. A series of pipe flow experiments were performed for a range of injected air superficial velocities over the range 0.05 to 4.73 m/s, whilst the liquid superficial velocities ranged from 0.05 to 0.38 m/s. Measurements of cross-sectional void fraction and radial time averaged void fraction across a pipe section located 4.92 m from the pipe flow injection were obtained using a capacitance wire mesh sensor (WMS). The data were recorded at a frequency of 1000 Hz over an interval of 60 seconds. For the range of flow conditions studied, the average void fraction was observed to vary between 0.1 and 0.8. An analysis of the data collected concluded that the observed void fraction was strongly affected by the gas superficial velocity, whereby the higher the gas superficial velocity, the higher was the observed average void fraction. The average void fraction distributions observed were in good agreement with the results obtained by other researchers. The accuracy and performance of void fraction correlations were carried out in terms of percentage error and Root Mean Square (RMS) error. Reasonably

show abstract

“…The application of Beer-Lambert's rule with the known intensity of the incident gamma beam makes it possible to deduce the average void fraction. [5][6][7][8][9][10] However, the use of this technique is limited to axis-symmetric void distributions and, in general, it requires long counting intervals and strong gamma sources. Beam scattering is a physical process by which the direction of the propagation of a wave changes due to its interaction with particles while it travels through a medium.…”

Section: Introductionmentioning

confidence: 99%

“…11,12 For industrial applications, this technique can be difficult to implement and it requires quite long time counting periods which are not convenient for rapid fluctuating flows. 5 When high intense beams are required, the use of X-rays permits large amount of photons to be generated; thus, they are preferred. 13,14 Nevertheless, the energy spectrum of Xrays is quite large, while both maintaining constant the photon flux and avoiding interferences with the detection system are usually cumbersome.…”

Section: Introductionmentioning

confidence: 99%

Development and assessment of a microwave void-fraction measurement system

Pochet

Teyssedou

Akyel

2014

Review of Scientific Instruments

View full text Add to dashboard Cite

The proof of concept of a non-invasive reflection-type void measurement system using microwaves is developed. Before constructing the instrument, governing equations are used to perform numerical simulations of different electrical components (reflectometer, antenna, etc.). Design and preliminary calibrations are performed based on these simulations. The results are then used to manufacture a setup that is installed on a Plexiglas vertical tube containing known volumetric fractions of gas in water at atmospheric conditions. The amount of injected gas and water are accurately controlled and the response of the system is compared with the simulations which confirm the suitability of such a system to study two-phase water-air mixtures.

show abstract

Dynamic Effects in Radiation Diagnosis of Fluctuating Voids

Cited by 34 publications

References 0 publications

Summary on experimental methods for statistical transient analysis of two-phase gas-liquid flow. [BWR, PWR, and LMFBR]

Summary on experimental methods for statistical transient analysis of two-phase gas-liquid flow. [BWR, PWR, and LMFBR]

Detailed analysis of phase distributions in a vertical riser using wire mesh sensor (WMS)

Development and assessment of a microwave void-fraction measurement system

Contact Info

Product

Resources

About