Convectie-fortata (1)
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Nr Marimea simb um val 1 Numar nervuri N 16 2 Diametrul nervurii d mm 12.7 3 Inaltimea nervurii h mm 44.3 4 Pasul longitudinal mm 38.1 5 Pasul transversal mm 30.8 6 Lungimea placii a mm 150 7 Latimea placii b mm 125 8 Aria totala 0.047030 9 Aria supr. nenervurate 0.016723 10 Aria supr. nervurate 0.030307 11 Ponderea supr nenervura 0.35559 12 Ponderea supr nervurate 0.64441 13 Aria canalului 0.01278 14 Latime canal m 0.113 15 Inaltime canal m 0.113 16 Diametrul echivalent m 0.113 Nr Marimea simb um 1 2 3 1 Viteza aerului w m/s 8.70 8.00 7.50 2 Temp. aerului 24.30 24.70 24.90 3 Temp. placii 44.60 44.60 44.60 4 Temp. la baza nervurii 42.60 42.00 42.70 5 Temp. la mijlocul nerv 40.30 39.50 40.30 6 Temp. la varful nervuri 39.50 38.70 39.50 7 Tensiune U V 215.00 210.00 207.00 8 Curent I A 0.333 0.329 0.326 Nr Marimea simb um 1 2 3 1 Fluxul de caldura Q W 71.595 69.09 67.482 2 Diferenta de temp Δt 20.30 19.90 19.70 3 Coef de convectie apare 75.0 73.8 72.8 4 Densitatea aerului ρ 1.171 1.170 1.169 5 Viscozitatea dinamica η Pa.s 1.849E-05 1.851E-05 1.852E-05 6 Viscozitatea cinematica ν 1.578E-05 1.582E-05 1.584E-05 7 Conductivitatea termica λ W/mK 0.028 0.028 0.028 8 Caldura specifica J/kgK 1005 1005 1005 9 Difuzivitatea termica a 2.378E-05 2.382E-05 2.383E-05 10 Criteriul Prandtl Pr 0.664 0.664 0.665 11 Criteriul Nusselt Nu 38.379 38.873 37.383 12 Criteriul Reynolds Re 6.235E+04 5.719E+04 5.355E+04 13 Temp. medie a nervurii 41.02 40.32 41.05 s1 s2 At m 2 Al m 2 An m 2 φl φn Ac m 2 L1 L2 de t9 o C t1 o C t3 o C t4 o C t5 o C o C αap W/m 2 K kg/m 3 m 2 /s cp m 2 /s tm o C Coeficientul de convectie
Transcript of Convectie-fortata (1)
Nervuri cilindriceNrMarimeasimbumval1Numar
nervuriN16nr.123456789102Diametrul
nervuriidmm12.784.6185.7082.4277.9674.4868.3862.7151.6141.7131.973Inaltimea
nervuriihmm44.3w8.708.007.506.305.604.103.202.201.200.204Pasul
longitudinals1mm38.1y4.444.454.414.364.314.234.143.943.733.4641.475Pasul
transversals2mm30.8x2.162.082.011.841.721.411.160.790.18-1.6111.766Lungimea
placiiamm150x24.684.324.063.392.971.991.350.620.032.5926.017Latimea
placiibmm125xy9.609.268.898.027.435.964.813.110.68-5.5852.188Aria
totalaAtm20.0470309Aria supr. nenervurateAlm20.016723Determinantul
sistemuluiDeterminantul lui aDeterminantul lui b10Aria supr.
nervurateAnm20.030307D=26.0111.76D1=52.1811.76D2=26.0152.1811Ponderea
supr nenervuratel0.3555911.761041.471011.7641.4712Ponderea supr
nervuraten0.64441121.8734.24465.1413Aria
canaluluiAcm20.0127814Latime canalL1m0.113a=0.28115Inaltime
canalL2m0.113b=3.817C=45.45416Diametrul
echivalentdem0.113NrMarimeasimbum12345678910Locatie1Viteza
aeruluiwm/s8.708.007.506.305.604.103.202.201.200.202Temp.
aeruluit9oC24.3024.7024.9025.0025.3025.9026.1027.1028.9030.103Temp.
placiit1oC44.6044.6044.6044.6044.6044.6044.6044.6044.6044.6004Temp.
la baza
nervuriit3oC42.6042.0042.7043.2042.7043.4043.8043.5043.8044.3055Temp.
la mijlocul
nervuriit4oC40.3039.5040.3041.2040.7041.7042.4042.2042.9043.80256Temp.
la varful
nervuriit5oC39.5038.7039.5040.4040.0041.4041.9041.8042.5043.4044.37TensiuneUV215.00210.00207.00200.00190.00182.00174.00152.00126.00110.008CurentIA0.3330.3290.3260.3260.3170.3040.2940.2590.2300.192NrMarimeasimbum123456789101Fluxul
de
calduraQW71.59569.0967.48265.260.2355.32851.15639.36828.9821.122Diferenta
de temptoC20.3019.9019.7019.6019.3018.7018.5017.5015.7014.503Coef
de convectie
aparentapW/m2K75.073.872.870.766.462.958.847.839.231.04Densitatea
aeruluikg/m31.1711.1701.1691.1691.1671.1651.1641.1601.1541.1495Viscozitatea
dinamicaPa.s1.849E-051.851E-051.852E-051.852E-051.854E-051.857E-051.858E-051.863E-051.872E-051.878E-056Viscozitatea
cinematicam2/s1.578E-051.582E-051.584E-051.585E-051.588E-051.594E-051.596E-051.605E-051.623E-051.635E-057Conductivitatea
termicaW/mK0.0280.0280.0280.0280.0280.0280.0280.0280.0280.0288Caldura
specificacpJ/kgK10051005100510051005100510051005100510059Difuzivitatea
termicaam2/s2.378E-052.382E-052.383E-052.384E-052.386E-052.391E-052.393E-052.401E-052.415E-052.425E-0510Criteriul
PrandtlPr0.6640.6640.6650.6650.6650.6660.6670.6690.6720.67411Criteriul
NusseltNu38.37938.87337.38335.35833.78431.01728.44123.40718.91814.49912Criteriul
ReynoldsRe6.235E+045.719E+045.355E+044.496E+043.989E+042.910E+042.268E+041.550E+048.363E+031.384E+0313Temp.
medie a
nervuriitmoC41.0240.3241.0541.7841.3342.2842.8142.6243.1643.9014Randamentul
nervuriin0.82350.78490.81960.85620.83070.87580.90330.88660.90850.951715Coef
de
convectieW/m2K84.6185.7082.4277.9674.4868.3862.7151.6141.7131.9762.3557.1953.5544.9639.8929.1022.6815.508.361.38Masurat8.699999999999999387.56.35.64.09999999999999963.22.20000000000000021.20.284.614767194118585.70363619377823782.41913878856051777.95506393204750974.48379139192667368.38333415417993462.70564671346410551.60528639178352341.70920369506843231.966533718721994Flux8.699999999999999387.56.35.64.09999999999999963.22.20000000000000021.20.271.59499999999999969.0967.48199999999999965.260.23000000000000455.32799999999999651.15599999999999939.36800000000000228.9821.12
Viteza [m/s]
Coeficientul de convectie [W/m2K
Fluxul de caldura [W]
8.7 m/s052544.344.642.640.29999999999999739.58,0 m/s052544.344.64239.538.7000000000000037.5 m/s052544.344.642.740.29999999999999739.56,3 m/s052544.344.643.241.240.45,6 m/s052544.344.642.740.700000000000003404,1 m/s052544.344.643.441.741.43,2 m/s052544.344.643.842.441.92,2 m/s052544.344.643.542.241.81,2 m/s052544.344.643.842.942.50,2 m/s052544.344.644.343.843.4Distanta de la baza [mm]
Temperatura nervurii [oC]
8.699999999999999387.56.35.64.09999999999999963.22.20000000000000021.20.20.823516329548866670.784872443481516080.819573512392433030.856221495370157130.83067053415829450.875828394152653790.903257885424928240.886578523057078070.908455665626662690.95166186658363816Viteza [m/s]
Randamentul nervurii
62.34877423880212257.19192357506696653.55186556928114844.95607146707540439.88777531008558729.0968716125019622.68210886364527915.499479488724028.36276998404970051.383776756613793138.37884083447517738.87272070217798637.38296652195422435.35818971203583133.78371966705245231.01672656278875528.44148975932121523.40668347055895318.91810310454889814.499106365277477Re10 -3
Nu
Sheet2
Sheet3
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