不同温度下空气中饱和水分含量及饱和蒸汽压兰州真空设备有限责任公司温度。c饱和水分含量g/m3饱和蒸汽压Pa温度c饱和水分含量g/m3饱和蒸汽压Pa4050.917368.624-121.81217.38243846.006618.708-141.52181.28523641.515935.392-161.27150.78243437.405314.68-181.06125.07483233.644483.512-200.888103.36323030.304238.42-220.73685.2482827.203776.22-240.59070.06322624.303357.972-260.50457.2762421.802981.016-280.41446.75322219.402641.356-300.34038.09522017.302336.33-320.27730.76921815.362061.936-340.22624.90841613.631815.516-360.18420.11321412.051597.068-380.14916.11721210.681401.264-400.12012.9204109.351226.77-420.09610.256488.281072.26-440.0778.125267.28933.732-460.0616.393646.39812.52-480.0495.061625.60704.628-500.0383.862804.85609.923-520.0303.0636-24.14516.816-540.0242.3976-43.52436.896-560.0181.8648-63.00368.298-580.0141.4652-82.54309.8232-600.0111.0656-102.14259.74-900.0093粘滞流下20°C空气的管道流导《真空设计手册》项目公式长管1.34X103d4pU=l短管111=+UUU矩形截面直管4560Ka2b2_Ufpla/b1.00.90.80.70.60.50.40.30.20.1Kf1.000.990.980.950.900.820.710.580.420.23环形管道n1340-「dd(d-d)2]U—PX[d—d—―12—]l12in(d/d)椭圆管道“42920—a3b3Upla2+b2孔A当1>x>0.525时，U一76.6x0.712xJl—x0.228—1—x—200A当x<0.525时，U一01—x当x<0.1时，U-200A0符号意义单位U粘滞流下20C空气流导m3/Sd管道直径ml管道长度ma、b椭圆长半轴，短半轴mP管道中平均压力PaAo孔面积m2x孔两侧压力比粘滞流—分子流下管道流导nd31+271(dP)+4790(dP)2U=121X—吋20Cl1+316(dP)d：管道直径ml：管道长度mP:管道中平均压力P=(P1+P2)/2分子流下20°C空气的管道流导《真空设计手册》项目公式圆长管U-12.1d3l圆孔U-9.11d2圆短管U-9.11d2xaL/d00.050.10.20.40.60.8a10.9650.9310.870.7690.690.6251.0246810204060801000.5720.40.250.1820.1430.1170.06250.0320.020.0010正方形15.45a3U—l矩形30.9Ka2b2U—fb/a10.6670.5000.3330.2000.1250.100o(a+b)l1.1081.1261.1511.1981.2971.4001.444等边三角形TT4.79a3U—l扁缝形30.9Kab2U—a>>b1/l/b0.10.20.40.81Kb0.0360.0680.130.220.26234510>100.400.520.600.670.941环形12.1K(d—d)2x(d+d)a1212djd]00.2590.50.7070.8660.966lKa11.0721.1541.2541.4301.675椭圆形TT136.6a2b21U—xA.1'a2+b2l锥形d2d2U—24.2―—(d+d)l12直角弯管4按直管计算,管道计算长度l—l+1+-d123缩孔”9.11d2d2U—1_2d2—d212符号：U流导（L/s）a和b椭圆长半轴、短半轴l管长（cm）A面积（cm2）d——管道直径（cm）材料物理性能组别牌号重度g/cm3膨胀系数dX106导热系数卡/厘米.秒.度电阻系数Q.mm2/m熔点C纯铜T18.920°C17.70.961083T28.917.70.951080T48.8917.40.431080黄铜H908.818.20.40.039H808.6519.10.340.054H658.4720.10.2880.069H628.4320.60.260.071纯铝20〜100C20〜200CL62.712424.80.54658L42.712424.80.52LY112.82223.40.41铸铝ZL22.810.230.240.33~0.354.66~4.926ZL52.580.2450.2550.218.21ZL102.650.190.210.385.27~5.57ZL142.70.220.230.35~0.455.88~6.67碳钢10钢7.8511.60.8080.13245钢7.8111.590.5020.132不锈钢1Cr18Ni97.90.0390.0420.1630.731Cr18Ni9Ti7.750.0390.0420.1630.73GB5832.2-86气体中微量水分的测定-露点法1适用范围本标准适用于氧、氮、氢、氦、氖、氩、氪、氙、二氧化碳等气体中微量水分露点的测定。其测量范围0°C〜-70°C。2原理2.1术语说明水分露点——在恒定的压力下，气体中的水蒸气达到饱和时的温度。2.2方法原理本法用露点仪进行测定。使被测气体在恒定压力下，以一定的流量流经露点仪溅定室中的抛光金属镜面。该镜面的温度可人为地降低并可精确地测量。当气体中的水蒸气随着镜面温度的逐渐降低而达到饱和时，镜面上开始出现露，此时所测量到的镜面温度即为露点。（由露点和气体中水分含量的换算式或查表，即可得到气体中微量水分含量。）3仪器3.1概述仪器可以用不同的方法设计，主要的不...
