流体管路流动阻力系数的测定

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1、五、数据处理1、局部阻力管的原始数据以及相关处理数据局部阻力管(不锈钢+闸阀)18°C水的密度：p=998.2kg/m3管内径：20mm18°C水的粘度：1.0559xl03Pas测量段长度:1000mm序号体积流量(m3/h)左(cmHQ)厶右(cmH2O)差值(Pa)流速(m/s)雷诺数(Rc)摩擦阻力系数局部阻力系数(g)10.572.574147.130.448331.450.03011.5068217075490.440.8816662.900.02511.255631.566.576.5980.881.3324994.350.02231.11614262.579.516

2、67.501.7733325.790.02131.067352.557822452.202.2141657.240.02011.0045635086.53580.222.6549988.690.02041.018573.54590.54463.013」058320.140.01870.93288433.593.55885.293.5466651.600.01890.9417闸阀全开时的平均g值为：0.10542、光滑管的原始数据以及相关处理数光滑管(不锈钢)18°C水的密度：p=998.2kg/m3管内径:20mm18°C水的粘度:1.0559x10^Pas测就段长度:1000mm

3、序号体积流量(m3/h)左(cmH.O)右(cmH2O)差值(Pa)流速(m/s)雷诺数(Re)摩擦阻力系数(QBlasius公式下算出的入绝对误差相对误差10.572.574147.130.448287.730.03050.02870.0017516.10%2170.574.5392.350.8816575.450.02030.0279-0.00357-14.95%31.56S77882.791.3325051.530.02000.0251-0.00139-6.49%4264.57&51373.231.7733339.260.01760.0234-0.00226-11.38%52

4、.559.581.52157.942.2141626.980.01770.0222-0.00098-5.24%6353.584.53040.732.6549914.710.01740.0212・0.00045・2.54%73.546884119.703」58390.790.01720.02040.0001020.60%8439915100.583.5466678.520.01630.0197-0.00017-1.05%3、粗糙管的原始数据以及相关数据处理粗糙管(镀锌铁管)18°C水的密度：p=998.2kg/m3管内径:20mm18°C水的粘度：1.0559xl03Pas测虽段长度

5、：1000mm序号体积流量(m3/h)左(cmH.O)厶右(cmH2O)差值(Pa)流速(m/s)雷诺数(Re)摩擦阻力系数(X)10.57274196.180.448331.450.04022169.575.5588.530.8816662.900.030131.565791373.231.3324994.350.0313425883.52501.251.7733325.790.032052.550893825.442.2141657.240.0313633997.55738.152.6549988.690.03264、根据计算所得的粗糙管和光滑管的实验结果，在同一对数坐标上绘制

6、曲线:光滑管、粗糙管在同一坐标轴上的入・Re曲线0.040.0350.030.0250.020.015-0.010.00500光滑管粗糙管R2=0.8749乘幕(粗糙管)2000040000—1—滑管)6000080000雷诺数(Re)对照《化工基础》教材上的曲线图(如下)，估算出两管的相对粗糙度和绝对粗糙度1090807060504030.0250.020.0150.010.0090.008It>MHftl一■■■■■•■■■■■S,iim^SSBMHiiiBBiiiiiaiai—「和llff和IIHTWKmJlitiT卅卅寸tHW0.05rj0.04ffl0030.020.01

7、50.010.0060.004000200010.00080.00060.00040.00020.0001000005103246104246心10雷诺准数Re因1-35厚攘系数几与雷诺惟数Re及相对粗犍度"d的关系0.0000146102已知光滑管和粗糙管的管内径都为20mm,将光滑管和粗糙管的兀和Re值代入上图可佔算为粗糙管的相对粗糙度为0.004,绝对粗糙度约为0.00008；光滑管的相对粗糙度约为0.0001,绝对粗糙度约为0.000002o5、数据方法示例：