翅片管束管外放热和阻力实验(实例)

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1、翅片管束管外放热和阻力实验一、测试数据表1测试数据表测试次数动压头(Pa)静压(Pa)空气温度（℃）热电偶测热管蒸汽温度——读数（mV）箱温(mV)电压（V）电流（A）ΔPHtitot1t2t3t4t51100359.713.93.9983.6413.054.7840.3452485.892200509.812.73.7143.2122.6384.4430.3482485.93300909.912.33.5652.9372.3944.2440.3582485.9144001109.811.93.4742.7862.264.1320.3582485.91550014

2、01011.73.4082.6822.1684.0530.3812485.9166001609.811.43.3572.5912.0823.9850.3852485.91二、物性参数的确定1、管内蒸汽温度的确定表2试验管内蒸汽平均温度热电偶测管内蒸汽温度——读数（mV）t1t2t3t4tm蒸汽温度(℃)3.9983.6413.054.7843.86890.93.7143.2122.6384.4433.50282.93.5652.9372.3944.2443.28578.13.4742.7862.264.1323.16375.43.4082.6822.1684.05

3、33.07873.53.3572.5912.0823.9853.00471.92、空气平均温度及空气参数的确定测试次数空气温度（℃）空气物性参数入口出口平均温度tf密度(kg/m3)出口处密度(kg/m3)比热(J/kg.K)导热系数(W/m.K)运动粘度(m2/s)19.713.911.81.2391.2311005.000.02521.43E-0529.812.711.251.2421.2361005.000.02521.43E-0539.912.311.11.2421.2371005.000.02521.43E-0549.811.910.851.2431.2

4、391005.000.02521.42E-0551011.710.851.2431.2401005.000.02521.42E-0569.811.410.61.2441.2411005.000.02511.42E-054一、实验数据的整理计算1、计算风速和风量表3风速和风量计算表测试次数动压头（Pa）测速处风速(m/s)风量Ma(kg/s)测速外流道截面积(m2)空气侧吸热量（W）110012.700.380.0241583.63220017.950.531551.27330021.980.651574.08440025.360.751591.88550028.3

5、60.841441.74660031.050.921487.33其中，空气侧吸热量：2、电加热器功率3、加热器箱体散热因箱体温度很低，散热量小，可由自然对流计算，其中，自然对流散热系数近似取5W/m2.℃。表4加热器箱体散热量测试次数箱温环境温度(℃)箱体散热面积箱体散热量（W）读数（mV）温度(℃)10.3458.58.44*0.58*0.32=0.74240.3720.3488.98.41.8630.3589.28.42.9740.3589.28.42.9750.3819.78.44.8360.3859.88.45.24、计算热平衡误差4表5热平衡误差表空气侧

6、吸热量Q1箱体散热量Q3功率(W)Q2热平衡误差%1583.630.371460.77.78451551.271.861463.25.79691574.082.971465.77.0751591.882.971465.78.1141441.744.831465.7-1.3251487.335.21465.71.80511、计算翅片管束最窄流通截面处的流速和质量流量（1）最窄流通截面处的流速其中，（2）质量流速铸铁管的导热系数为52W/m.K2、计算Re数：3、计算传热系数：4、计算管内凝结液膜放热系数：以上各项计算结果见表64表6实验数据整理表序号最窄流通截面积最

7、窄流通截面处的流速质量流速翅片管外径D0(m)计算Re数加热管根数n计算传热系数K管内凝结液膜放热系数管壁热阻管外放热系数计算Nu　压差损失摩擦系数10.05885.1856.4260.0269412.5184.090.3057499.8046.55911E-0592.29695.060352.94127.3269.09713345.04797.6588612.12499.767102.935502.10138.97011.14416355.604105.9719181.535108.350111.843902.521410.35312.87318907.6851

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