[問題] 水的雷諾數? 入口長度?
計算為層流情形
流量為0.00055 m^3/s
管子直徑為1.2*10^-2 m
管子截面積為0.0001131 m^2
液體為水，密度為1000 kg/m^3，黏度為0.001 Pa*s
運動黏度為0.001/1000=0.000001 m^2/s
雷諾數為0.00055*1.2*10^-2/(0.000001*0.0001131)=58355.437665
怪怪的...怎這麼大!!!?
參考文章:http://em.sjtu.edu.cn/fluid/neirong/c/C_32.htm
上面寫層流時，最大入口長度為138*直徑(雷諾數=2300)
請問我哪裡代錯了?
感謝!!!
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