化工原理 裸管和绝热管传热实验数据处理.doc

实验六 裸管和绝热管传热实验保温层长度 L = 800mm 裸管部分外表面积 A wo = 0.0098 m2空气夹层保温管蒸汽管外径 d =121.5mm（黄铜）外套管外径 d =33.53.25 mm（镀铬钢管）保温层长度 L =80mm裸管部分外表面积 A wo =0.0098m22)操作参数蒸气压强 P = 99.6 Pa蒸汽温度 T = 100 蒸汽冷凝热 r = 2256,.5 J kg 11)设备参数裸蒸汽管 蒸汽管外径 d = 121.5mm（黄铜） 蒸汽管长度你 L = 800mm连接管和分液器外表面积 A wo =0.0098 m2固体材料保温管保温层材质 膨胀珍珠岩散料保温材料堆积密度 b = 54252kg m 3内管管径 d = 121.5mm（黄铜）保温层内径 d=12 mm保温层外径 d = 40.8 mm外管管径 d2= 504.6 mm（ABS）1测量并记录实验设备和操作基本参数2实验数据记录裸蒸汽管序号123456均值室温Ta/27.827.827.827.827.827.827.8冷凝液质量m/g2.963.233.12.812.693.182.995受液时间t/s139.32159.75141.34136.97134.87151.32143.9283管外壁温度U/mv3.913.873.93.93.93.93.896667Tw/92919292929291.83333固体材料保温管序号123456均值室温Ta/27.827.827.827.827.827.827.8冷凝液质量m/g3.092.453.112.813.212.592.876667受液时间t/s232.25187.07238.6221.75243.4199.76220.4717管内壁温度U/mv3.913.913.93.93.93.93.903333Tw/92929292929292管外壁温度Tw/38.138.238.138.238.138.138.13333空气夹层保温管序号123456均值室温Ta/27.827.827.827.827.827.827.8冷凝液质量m/g3.853.612.843.553.153.963.493333受液时间t/s236.12224.47164.03219.66180.79241.68211.125管内壁温度U/mv3.913.873.93.93.93.93.896667Tw/92919292929291.83333管外壁温度U/mv2.382.382.382.382.382.382.38Tw/585858585858583整理实验数据(1)裸蒸汽管冷凝液流率总给热速率总给热面积总供热推动力总给热系数ms10-5kgs1QWAwm2TK（实测值）Wm2K12.08147.0200.039964.03318.383定性温度定性尺寸空气密度空气粘度空气比热容空气导热系数空气膨胀系数TmKmkgm310-5Pa sCpJkg1K110-2Wm1K110-3K1332.820.0121.062.0110052.893.68普朗特数格拉斯霍夫数Pr GrCn给热系数PrGr（实测值）Wm2K10.69611085.902 7715790.540.2512.2(2)固体材料保温管冷凝液流率m s10-5kgs1热损失速率QW推 动 力TK导热系数Wm1K11.3047817.94753.86670.08112(3)空气夹层保温管冷凝液流率热损失速率推 动 力等效导热系数ms10-5kgs1QWTK（实测值）Wm2K11.65437.33733.8330.1698定 性温 度定 性尺 寸空 气密 度空 气粘 度空 气比 热 容空 气 导热 系 数空气体积膨胀系数TmKmkgm310-5PasCpJkg1K1Wm1K110-3K1347.9170.007