Page 183 - konishipaper

~O
60 40 20
@
一 -lRcamera 里misivity0.95
@ 百 lermocouples
5 10 15 20
Time(rnin)
8 6 4 2
;，t=2.0s t=0s
Heating l-propanol
Fig.6. Surfacetemperaturechangeinl-propanolwhentheheat- ingrateisconstant.
andtheintensity，asinFig.5(c)，isexpresedas
Fig. 7. throughpropanolfuelvaporandthefueltray.
peraturereachedthequasi-steadystateataproxi- mately2saftertheonsetofT e •
Figure8showstheprofilesofln(Te/Tw)，ln(T/Tw)， andln(T/Te)，alofwhichhaveappearedinEq.(14). Figure9showstherelationshipbetween1n(T/Te) andavaporconcentrationprofile，whichwasprevi- ouslymeasuredbyho1ographicinterferometry.9 To
8 6 4
I(z)=~σε'P(z)， マT
(13)
whereT(z)isthesurfacetemperatureofthegray- bodythroughthe五1e1vaporandthetrayedgeas measuredbytheIRcamera. SubstitutingEqs.(1)一 (13)intoEq.(10)，weobtained
4 ， IT(z)I p(z)=一一一一 logel一一一 | (14)
~~bel
α^mL
Te(z)I
The2・D concentrationprofileof1-propano1vapor overtheliquidpropano1surfacewasobtainedprevi- ous1ybyuseofholographicinterferometry.l0 Ifp(z) isknown，theaverageabsorptioilmasscoeficientαM canbecalculated企omEq.(14). Finaly，weob- tainedthetransmisivityofthefuelvapor，I(hg)/I(O)， bysubstitutingtheaverageabsorptionmasscoe:D貧困 cientαλm intoEq.(6).
4. ResultsandDiscusion
Figure6showsthesurfacetemperaturehistoryof 1-propano1asmeasuredwithbothafinethermocou- p1eandtheIRcamerawith0.95emisivity. Thereis goodagreementbetweenmeasurementswhenthe
liquidtemperatureisbetween20and40oC，however theIRtemperaturedecreaseswhentheliquidtem- peratureincreasesbeyond40oC. Thetemperature diferencethatisduetoabsorptionbypropanolvapor eventualyreachesitsmaximumof10%whenthe liquidtemperatureis80oC.
Figure7showsthesurfacetemperatureprofi1esof thecoperb10ckmeasuredbytheIRcamera. Inthis experiment，thetemperatureofthe1iquidfue1and theairwaskeptat30oCandthesurfacetemperature ofthecopercy1inderblockwaskeptat80oC. Fig- ure7includestwotemperatureprofi1es: surface
temper叫 ureTeasinFig.5(b)andsurfacetempera-
tureTasinFig.5(c). Whenthea1uminumcover p1atewasremoved，thetimewassetatzeroand temperatureTewasmeasuredasafunctionoftime. TemperatureTwasmeasuredwhenthesurfacetem- interferometrylOasa品工lctionofln(T/Te).
4282 APPLlEDOPTICS/Vo.l39，No.24/20August2000
50 60 70 80 90 Te，T(OC)
TemperatureprofilesmeasuredwiththeIRcamera
2 J
〉
三三
0.02 0.04 0.06 0.08 0.1
ln[Te汀 wJ，ln[T，汀wJ，lnπ庁 e]
Fig.8. Verticalpro五lesofln(Te/Tw)，ln(T/Tw)，andln(TITe).
4 3
2 ¥ C(vol%)=1741n[T/Tel
0.02 0.04 0.06 0.08 0.1 ln[Tfe]
Fig.9. Vaporconcentrationofpropanolmeasuredbyholographic
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