Transcription of 在管路中的阻力計算(上) - hvac-net.org.tw
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在管路中的阻力計算(上) - hvac-net.org.tw
1 ( ) ! 1. (turbulent flow) Smooth turbulent ( laminar flow) Re < 2000 Transitional turbulent (transition flow) 2000< Re <4000 Rough turbulent ( turbulent flow ) Re > 4000 Re =64/f ( Reynold s Number) f friction factor ( ) Re = GDvD = / D m v m/s Kg/m3 Ns/m2 , Kg/ms G Kg / sm2 Re = GDvD =113= KgsmmmmKg 2 Re 2. (a) Darcy Weisbach Equation ( laminar flow) (full flow) 1Kg/cm2 (duct) (b) Colebrook White Equation (turbulent flow) (water flow pipeline).
6 j T = f 1] Re f 9.35 di 1.14 −2log10[+ ε 英制單位! = f 1] Re f 1.255 3.7di −4log10[+ e 公制單位! [ !f!值在下表中可以查知。
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