实验报告-气-汽对流传热综合实验.doc

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1、气-汽对流传热综合实验1.光滑套管换热器传热系数的测定数据记录与整理表传热管内径di=0.020m有效长度Li=1.00m冷流体：空气（管内）热流体：蒸汽（管外）数据项目12345孔板压差ΔPkPa0.271.051.852.583.41空气入口温度t1℃31.835.337.639.742.2空气出口温度t2℃75.269.868.969.570.9壁面温度Tw℃99.999.9100.099.9100.0管内平均温度tm℃53.552.653.854.656.6空气密度ρmkg/m31.0811.0851

2、.0801.0781.071空气导热系数λm*100W/m·℃2.8512.8442.8532.8582.872空气定压比热容CpmkJ/kg·℃1.0051.0051.0051.0051.005空气粘度μm*100000Pa·s1.981.971.981.981.99空气进出口温度差Δt℃43.434.531.329.828.7平均温差Δtm℃46.447.346.245.343.420℃时空气流量V20m3/h11.79323.25630.87036.45541.911管内平均流量Vm3/h12.8842

3、5.19433.44239.45645.456平均流速um/s11.3922.2729.5734.8840.19传热量QW168.74263.27315.59353.84390.06对流传热系数αiW/m2·℃57.8788.57108.70124.30143.02雷诺数Re1243624531322583798043260努赛尔准数Nu40.6062.2976.2086.9899.60Nu/Pr0.446.87971.00788.036100.549115.1372.强化套管换热器传热系数及强化比的测定数据

4、记录与整理表传热管内径di=0.020m有效长度Li=1.00m冷流体：空气（管内）热流体：蒸汽（管外）数据项目12345孔板压差ΔPkPa0.150.671.151.702.23空气入口温度t1℃29.030.130.931.632.2空气出口温度t2℃90.785.182.681.982.4壁面温度Tw℃99.699.799.899.999.9管内平均温度tm℃59.957.656.856.857.3空气密度ρmkg/m31.0601.0681.0711.0711.069空气导热系数λm*100W/m·℃

5、2.8952.8792.8742.8742.877空气定压比热容CpmkJ/kg·℃1.0051.0051.0051.0051.005空气粘度μm*10000Pa·s2.012.001.991.992.00空气进出口温度差Δt℃61.755.051.750.350.2平均温差Δtm℃39.742.143.043.142.620℃时空气流量V20m3/h8.7918.5824.3429.5933.89管内平均流量Vm3/h9.83720.61326.90232.66637.432平均流速um/s8.7018.2

6、223.7828.8833.09传热量QW179.60338.02392.16491.27560.77对流传热系数αiW/m2·℃71.99127.77145.13181.39209.48雷诺数Re917619458255963108635373努赛尔准数Nu49.7388.76101.0126.23145.62Nu/Pr0.457.42102.49116.76145.92168.14Nu031.9854.3766.0475.7382.98强化比Nu/Nu01.561.631.531.671.753.线性回归

7、确定准数关联式由可得由线性拟合结果可求得：光滑套管换热器A=0.0581m=0.7074强化套管换热器A=0.0496m=0,771