传热实验数据处理

1、五、实验数据记录及处理简单套管换热器数据传热管内径：18mm 传热管有效长度：1m 冷流体：空气热流体：水蒸气序号123456空气流量读数？P(kPa)0.510.781.323.124.79空气入口温度ti(C)30.632.333.836.438.944.4空气出口温度t2(C )64.163.762.662.462.364.3壁温t 乂 C)63.363.663.564.164.264.3空气在t1时的密度 P t1(kg/m3 )1.1631.1571.1511.1411.1321.112空气平均温度tm (C)47.354848.249.450.654.35空气在入口处流量 Vt1(

2、m3/h)16.20820.04525.87732.09740.08949.673空气平均流量Vtm(m3/h)17.10221.07527.09233.44641.59351.230空气平均流速utm (m/s)18.67823.01729.58936.52845.42655.951空气在 平均温 度时的 物性p m(kg/m3)1.1011.0991.0981.0941.0901.077卩 m*105(Pa s)1.9491.9521.9531.9591.9651.983入 m*102(W/m-C)2.8142.8192.8212.8302.8402.869Cp(kJ/kg C)1.005

3、1.0051.0051.0051.0051.005空气进出口温度之差t2-t1( C )33.531.428.82623.419.9壁面和空气的温差tw-tmC)15.9515.615.314.713.69.95空气得到的热量Q( kW0.1760.2030.2390.2660.2960.306空气侧对流传热系数 a i(W/m2. C)195.330230.195276.554319.563385.112544.821Re18990.20323315.29029937.36036707.54345340.88554682.901Nu124.930146.965176.464203.23324

4、4.112341.832Pr0.6960.6960.6960.6960.6950.695Nu/( PrAO.4)144.415169.899204.007234.988282.297395.480Nu/( PrO.3)139.276163.850196.742226.612272.224381.326普通套管对流传热系数与流速关系图6050203040流速 utm (m/s)10- - L - L _ O OOO OOO O OOO OOO6 5 4 3 2 1 )r 2E3 (1 数系热传流对强化套管换热器数据传热管内径：18mm 传热管有效长度：1m 冷流体：空气热流体：水蒸气序号1234

5、56空气流量读数？P(kPa)0.340.530.831.322.033.15空气入口温度ti(C)34.432.732.834.437.543.9空气出口温度t2(C )82.181.180.179.178.779.9壁温tw( C)64.564.464.464.664.765.1空气在t1时的密度 P t1(kg/m3 )1.1491.1551.1551.1491.1371.113空气平均温度tm (C)58.2556.956.4556.7558.161.9空气在入口处流量Vt1(m3/h)13.23416.52320.67726.07632.33740.281空气平均流量Vtm(m3/h

6、)14.26117.83122.27627.97234.48242.569空气平均流速utm ( m/s)15.57519.47424.32930.54937.66046.492空气在平 均温度时 的物性p m(kg/m3)1.0631.0681.0691.0681.0641.051卩 m*105(Pa s)2.0011.9951.9931.9942.0012.019入 m*102(W/m-C)2.8992.8892.8852.8882.8982.928Cp(kJ/kg C)1.0051.0051.0051.0051.0051.005空气进出口温度之差t2-t1( C)47.748.447.3

7、44.741.236壁面和空气的温差tw-tm (C)6.257.57.957.856.63.2空气得到的热量Q( kW0.2020.2570.3150.3730.4220.450空气侧对流传热系数 a i(W/m2. C)571.662606.961700.088840.5491131.1312486.941Re14895.97918764.80923501.41029461.05236048.12743584.003Nu354.921378.205436.762523.968702.5541529.099Pr0.6940.6940.6940.6940.6940.693Nu/( PrAO.4)410.816437.696505.437606.376813.1811770.672Nu097.046119.204145.650178.096213.097252.208Nu/Nu03.6573.1732.9992.9423.2976.