雷诺系数问题# Engineering - 工程
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想计算一个硬塑料管子里面的流动是否层流:
流速 v 是0.1~1 m/sec
内直径 D 是 0.00449 m
流体就是室温水了 粘度 u 是 0.000001 m^2/sec
计算的Reynolds number 是: v*D/u = 449~4490
应该算得没错吧？
找了几个判断层紊流的标准：
（１）The flow is
laminar if Re < 2300
transient if 2300 < Re < 4000
turbulent if 4000 < Re
http://www.engineeringtoolbox.com/21_574.html
（２）Poiseuille (laminar) flow is experimentally found to occur for Ｒe<30.
At larger Reynolds numbers, flow becomes turbulent.
http://scienceworld.wolfram.com/physics/ReynoldsNumber.html
(3)对于圆管水流 Re=Vd/n
流速 v 是0.1~1 m/sec
内直径 D 是 0.00449 m
流体就是室温水了 粘度 u 是 0.000001 m^2/sec
计算的Reynolds number 是: v*D/u = 449~4490
应该算得没错吧？
找了几个判断层紊流的标准：
（１）The flow is
laminar if Re < 2300
transient if 2300 < Re < 4000
turbulent if 4000 < Re
http://www.engineeringtoolbox.com/21_574.html
（２）Poiseuille (laminar) flow is experimentally found to occur for Ｒe<30.
At larger Reynolds numbers, flow becomes turbulent.
http://scienceworld.wolfram.com/physics/ReynoldsNumber.html
(3)对于圆管水流 Re=Vd/n
