实验序号1234567强化管入口温度t1/C42.741.838.636.033.230.328.0强化管出口温度t2/c80.680.486.079.379.479.781.5强化管壁温度twb/C93.293.893.893.794.094.494.9孔板流量计压差/Kpa2.101.951.701.451.050.700.35加热电压/V190190190190190190190冷流体平均温度/ C61.6561.1062.3057.6556.3055.0054.75冷流体密度P /Kg.m-30.990.990.991.011.011.021.02冷流体流量V/m-3.h-132.56431.34329.34026.82722.76218.53313.098质量流量ms2 kg/s0.00900.00860.00810.00750.00640.00520.0037冷流体比热Cp/ Jkg-1 C-11005100510051005100510051005冷流体的对数平均温 差Atm/C27.3028.4724.2231.2032.3933.5533.27总传热系数K/W.m-2.K-1165.798156.237209.975138.938121.868103.00479.572近似法对流给热系数/W.m-2.K-1165.798156.237209.975138.938121.868103.00479.572流体粘度 /Pa.s2.018E-052.015E-052.021E-051.999E-051.992E-051.986E-051.985E-05导热系数入2管内流速U2普兰特数Pr雷诺数Re努赛尔数Nu努赛尔数理论值Nu理论W/（m2C）各点的相对误差/%ln（Nu/Pr0.4）ln （Re）0.02930.02920.02930.02890.02880.02870.028728.80827.72725.95623.73220.13716.39511.5870.6930.6930.6930.6940.6940.6940.69428287.027325.725376.323934.520492.816831.811915.5113.34106.96143.3096.0084.5171.6855.4172.3370.3666.3163.3155.9247.7836.25105.80102.7797.1691.6380.6468.6652.0556.7152.02116.1251.6451.1250.0152.874.8774.8195.1124.7114.5834.4184.16110.25010.21610.14210.0839.9289.7319.386冷流体给热系数的准数式：Nu/Pro.4 = ARem，以lu/P尚）为纵坐标，ln（Re）为横坐标，将实验数据的结果标绘在图上， 由实验数据作图拟合曲线方程，确定式中常数A及m；并与教材中的经验式 Nu/Pro.4 = 0.023Reo.8 比较ln（Nu/Pr0.4）与血（Re）的关系图y = 0.816x -3.514 R2 = 0.9975.0004.8004.6004.4004.2004.0009.2009.4009.6009.80010.00010.20010.400ln（Re）冷流体给热系数的准数式：Nu/Pio.4 = Y Rem由图表得拟合曲线方程：y = 0.816x - 3.514则 m=0.816Ln（A）=-3.514A=0.030与教材中的经验式 Nu/Pro.4 = 0.023Reo.8 比较误差较大，Nu = 0.023Reo.8 Prn 有条件范围，而实验数据并未全在此范围 之内。