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Quantitative Evaluation of Void Fraction on Boiling Two-phase Flow in a Tube by Using Neutron Radiography2012/01/06-07
Seminar on neutron imaging @KURRI Quantitative evaluation of void fraction of boiling two-phase flow in a tube using neutron radiography 1. Background and objective 2. Experimental apparatus 3. Image processing method 4. Experimental result
Another experiment 1. downward flow 2. Oscillatory flow Summary IntroductionBoiling two-phase flowSingle phase liquidSlug flowAnnularflowBubbly flow
3 Radiographyf0
Neutron beamr[g/cm3] : mm [cm/g] f
Visible lightConverterMirrorCCD cameraLens
4 Radiographyf0
Neutron beamr[g/cm3] : mm [cm/g] f
Visible lightConverterMirrorCCD cameraLens
Objective5 Radiography
SGSLSTPOair onlyliquid onlytwo-phase flowoffset
Void fraction01Void fraction distribution
6
Nuclear reactorKURB4 portThermal output1 MWNeutron flux1107 n/cm2sTypical spectrum1.2 AGuide tube length11.7 mGuide tube cross section10D75D mm Nuclear ReactorB-41MW7 Imaging SystemConverter ZNSL-L100-AL1016CHICHIBU FUJI co., ltd.LensAPO MACRO 180mm F3.5SIGMA corporationCCD camera PIXIS 1024BPrinceton InstrumentsImaging array 10241024 pixels
LensCCD camera CCD cameraLensCCD8
Experimental Apparatus I.D.3mm, 5mm, 10mmG3006001000kg/m2sTin80 deg.CExperimental condition Experimental Apparatus
ToutD.P. CellElectrical InsulationElectrodeTinD.P. CellElectrical InsulationElectrode400,1000
z=010 Visible regionxzy
68.6Flame size10241024pixelpixelSpatial resolution 0.067mm/pixelExposure time20s (3mm,5mm)30s (10mm) Measurement Error
White spot noiseDUgObjectConverterNeutron sourceNeutron beamLPenumbraLf=25mm Dh Dw
Ls=4675mmUgw=0.11mm(2pixel)Ugh=0.8mm(14pixel)Dw=10mm Dh =75mm Measurement ErrorUnsharpness--13
2100I.D=5 mm Measurement ErrorDynamic range
B4C GridTest sectionConverter5331003AluminumB4C Measurement ErrorScattered neutrons100
6% Tube Wall +5%-5%
Void fractionLiquid thickness0.56%5%15
Z=370 mm
Z=210 mm
Z=150 mm Void fraction (5mm)
Void fraction0Thermal output : 1MWExposure : 20s
Electrode400
z=0
I.D.=5mm L=400mmG=600kg/m2s
Experimental result (q:const.) I.D.=5mm L=1000mmTout=156 deg.C (0.57 MPa)Tout=145 deg.C (0.43 MPa)
Tout=172 deg.C (0.8 MPa)Tout=165 deg.C (0.7 MPa).
Experimental result (q:const.) I.D.=5mm L=400mmTout=172 deg.C (0.8 MPa)Tout=165 deg.C (0.7 MPa).Tout=156 deg.C (0.57 MPa)Tout=145 deg.C (0.43 MPa) Quantitative evaluation of void fraction of boiling two-phase flow in a tube using neutron radiography 1. Background and objective 2. Experimental apparatus 3. Image processing method 4. Experimental result
Another experiment 1. downward flow 2. Oscillatory flow Summary
G=300 kg/m2s Experimental result (q:const.) I.D.=10mm L=400mm
Void fraction0Thermal output : 1MWExposure : 30sSynchronous signal-CCD
Pulse Counter
Delay Timer
CCD
Oscillator
Oscillatory flow120000200001CCDOscillatory flow
Experimental conditionst=4 s, DG/G0=1.0, q=124.8 kW/m2, xeq=0.009 Experimental result Thermal output : 5MW
Void fraction0Exposure time0.03 sAccumulation number34Accumulated exposure time1.0 s221000mm 400mm Summary