对流传热系数计算

s2空气流速 u m/s 5.9436924988.84642611.4727114.0989917.0017319.4897821.8396123.08364空气定性温度t 平均°C 64.865.8567.7569.2570.57171.1571.15

定性温度下的 kg/m 31.0419904 1.038637 1.0326261.027931 1.024053 1.02251 1.022048 1.022048冷、热流体间°C 33.4769913833.4347932.2283430.9941730.3218430.26830.2560530.41552总给热系数K w/(m 2

·°C)42.039853157.62438

70.18535

84.0692395.06418104.2114113.0967117.5125空气黏度 1.88204E-05 1.88E-05 1.88E-051.87E-05 1.87E-05 1.87E-05 1.87E-05 1.87E-05空气导热系数0.027*******.0270520.0269570.026860.0268070.0268030.0268020.026815雷诺数Re 5265.1453777812.1310104.2512400.5814923.3917083.9419135.6620217.24普兰特数 Pr 0.7018775210.7018870.702160.7024410.7025950.7026070.702610.702573努赛尔数Nu 24.861176334.0816141.656950.0778756.7391562.2085667.5149570.11816努赛尔数理论Nu'18.9391578225.9687

31.9084537.5945943.6017448.5828753.1971355.5881' W/(m 2

·°C)32.025*******.9072853.7607463.1126773.0529681.3857889.1124293.16128各点的相对误-0.312686474-0.31241-0.30551-0.33205-0.3013-0.28046-0.26915-0.26139

ln(nu/pr

^0.4)

3.354905947 3.670351 3.870904

4.054857 4.179655 4.271676 4.353531 4.391384ln(Re)8.5688640368.963433

9.2207129.4254989.6106859.7458949.8593099.914291

'ρm

t ?2

α2

α2

α

B8=(B6+B7)/2