NASA NACA-RM-E50H23-1950 Correlation of forced-convection heat-transfer data for air flowing in smooth platinum tube with long-approach entrance at high surface and inlet-air tempe.pdf

1、RNA 17FflH7 x.)f - +tLl -=5= .-. A . _.,_L_e.e. .: ”.-.4* ,-=iiiNACA-,.-i_-=.,-,.-._.-T-, , ! . ,II , 1, I 1111111 ”$1” iProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-JU . IiI I I I I Ill I M I I I I 1 I11 1 1 1 1 1 1 I t1. , I , 1 1 , 1 1 1 1 1 I

2、1 I 1 I I11FIEu.a 5. . Oormlaticm of heat-tmrmfar data at inlet-air tmprature of WO” B Uatis Oriad UfUO IWIIQl.o,&=-PaVbDModified surfaoe Reynolde number, l%.Figure 8. - Correlation of heat-traosfer data at elevated inlet-air temperaturesfled surface Reynolds number. Plqskal properties of air evalua

3、ted at averagetemperature Ts.L, * a71 a77a15I ,-rf! .,T7106Al*ueing modl-surfaceProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-,-Nusselt number sPrandtl numberO”*o0.#a71“m-Provided by IHSNot for ResaleNo reproduction or networking permitted without

4、license from IHS-,-,-E., tomI I(: )lg g_ 1“2 o. 0540a P r. 760:“n 1m nl a75 960-JA 11650 on +.-.ModifiedsurfaoeReynoldsnumber,W1%Figure 10. - Vmiat,ion of constant in heat-transfer equation with inlet-airtemperature. Phyaioalproperties of air evaluatedat averageatfrfaaetemperature Ts. Averagasurface

5、temperaturesup to 3033R.pfvlModifiedfilm Reynoldsnumber,_PfFigure 11. - variation of Con,etant h heat -trmsfer equeti On with let-airtemperature. Physicalpropertiesof air evaluatedat averagefilm tempera-ture Tf. Averegesurfecetemperaturesup to 3053R.Provided by IHSNot for ResaleNo reproduction or ne

6、tworking permitted without license from IHS-,-,-.,1Km 4,-14P Ial?!-:1_“ mlt I I I I I I III I I 1 I 1 1 11 lam IT 1 ,I 1 I I I I I tModified nurfnoa Pnolda rnmbar, -14Figure 1s.-Ccm.olntlm of bmt. -trmsfm. data obtained on two hau.tortubas at. inlet-air tamparaturdl from 54 to l16 Rusing modied mn.f

7、ane Pieynoldanunber. Phy9icml PP0p0rt108 of a71iF evaluated !ltavOrII 3UIV%08 tOmPOPaWre Ts.Avnrne .mlrfmm tempemtllre, Up to Xl&l” R.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.Em,.1?3! 1 -MadMid film Raynol& mmber, Pftoalg.&Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-