Subchannel void-fraction measurements in a 6 × 6 rod bundle using a simple gamma-transmission method

Kok, Hermine E. de; Hagen, T.H.J.J. van der; Mudde, Robert F.

doi:10.1016/s0301-9322(00)00005-7

Cited by 51 publications

(15 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the photon flux of isotopic sources is limited, typically to a few hundred photons/(mm 2 s) at 1 m distance, an efficient detector design is required. In most gamma ray CT devices this has been achieved by using large Bismuth Germanate (BGO) or CsI(Tl) crystals coupled to photomultiplier tubes [14][15][16][17][18][19]. Such arrangements, however, have clear limits regarding spatial resolution.…”

Section: Introductionmentioning

confidence: 99%

Liquid flow texture analysis in trickle bed reactors using high-resolution gamma ray tomography

Schubert

Hessel

Zippe

et al. 2008

Chemical Engineering Journal

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Liquid flow texture analysis in trickle bed reactors using high-resolution gamma ray tomography

Schubert

Hessel

Zippe

et al. 2008

Chemical Engineering Journal

View full text Add to dashboard Cite

“…2,3) However, the limitation at low void fraction still remained due to the difficulty in separating the signals from the ultrasonic reflection at high gas intensity. Furthermore, the radiometric tomography using γ -ray 4,5) and X-ray 6,7) has been progressively developed. These methods can overcome the problem of other measurement techniques such as high spatial resolution, high void fraction range, the application in opaque liquid and also non-intrusive technique.…”

Section: Introductionmentioning

confidence: 99%

Intrusive Effect of Wire Mesh Tomography on Gas-liquid Flow Measurement

Wangjiraniran

Motegi

Richter³

et al. 2003

Journal of Nuclear Science and Technology

View full text Add to dashboard Cite

To investigate the accuracy of wire mesh tomography (WMT) for gas-liquid flow measurement, the experimental study focused on its intrusive feature has been carried out. The WMT principle is based on the dependency upon electrical conductivity on the local void fraction. The applied wire mesh sensor (WMS) consists of two measuring planes. Each plane has 8×32 crossing points with spatial resolution of 2.22×3.03 mm 2 and wire diameter of 0.125 mm.The disturbance level is estimated from the deviation of flow properties between each measuring plane of WMT and also from the alternative image processing for low gas intensity range. The results show the dependency of disturbance level on the void fraction shape. Furthermore, the contribution of deceleration and deformation on the flow disturbance related to the flow condition are presented. In addition, the capability of gas velocity evaluation method is confirmed and the intrusive effect becomes only one important parameter for gas velocity measurement.

show abstract

“…There exist several other techniques to measure volume fraction in a multiphase flow which include light attenuation, 7 transmission of gamma rays, 8 neutron radiography, 9 etc. All of these techniques are limited to obtain line or volume average measurements.…”

Section: Introductionmentioning

confidence: 99%

Impedance probe to measure local gas volume fraction and bubble velocity in a bubbly liquid

Zenit

Koch

Sangani

2003

Review of Scientific Instruments

View full text Add to dashboard Cite

A new quasi-steady method to measure gas permeability of weakly permeable porous media Rev. Sci. Instrum. 83, 015113 (2012) Rheological measurements of large particles in high shear rate flows Phys. Fluids 24, 013302 (2012) High pressure rheometer for in situ formation and characterization of methane hydrates Rev. Sci. Instrum. 83, 015106 (2012) Non-resonant parametric amplification in biomimetic hair flow sensors: Selective gain and tunable filtering Appl. Phys. Lett. 99, 213503 (2011) Effect of plumes on measuring the large scale circulation in turbulent Rayleigh-Bénard convection Phys. Fluids 23, 095110 (2011) Additional information on Rev. Sci. Instrum. We have developed a dual impedance-based probe that can simultaneously measure the bubble velocity and the gas volume fraction in length scales comparable to the bubble diameter. The accurate determination of the profiles is very important for comparisons with existing theories that describe the rheological behavior of bubbly liquids. The gas volume fraction is determined by the residence time of bubble within the measuring volume of the probe. We have found that the details of the bubble-probe interactions must be taken into account to obtain an accurate measure of the gas volume fraction at a point. We are able to predict the apparent nonlinear behavior of the gas volume fraction measurement at large concentrations. The bubble velocity is obtained from the cross correlation of the signals of two closely spaced identical probes. Performance tests and results are shown for bubble velocity and bubble concentration profiles in a gravity driven shear flow of a bubbly liquid.

show abstract

Subchannel void-fraction measurements in a 6 × 6 rod bundle using a simple gamma-transmission method

Cited by 51 publications

References 6 publications

Liquid flow texture analysis in trickle bed reactors using high-resolution gamma ray tomography

Liquid flow texture analysis in trickle bed reactors using high-resolution gamma ray tomography

Intrusive Effect of Wire Mesh Tomography on Gas-liquid Flow Measurement

Impedance probe to measure local gas volume fraction and bubble velocity in a bubbly liquid

Contact Info

Product

Resources

About