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发表于 2016-11-18 22:51:24
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显示全部楼层
这个是根据你时间管道的材料和加工精度来确定,软件里面有一个推荐的列表
Pipe Material Absolute roughness Δ
drawn brass 1.5 μm
drawn copper 1.5 μm
commercial steel 45 μm
wrought iron 45 μm
asphalted cast iron 120 μm
galvanized iron 150 μm
cast iron 260 μm
wood stave 0.2 to 0.9 mm
concrete 0.3 to 3 mm
riveted steel 0.9 to 9 mm |
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