Given: Air @ 20ºC, _ = 1.2 kg/m3, _ = 1.8E-05 Pa.s
Square channel = 50_ x 50_, Length = 56 mm
_P = 1 kPa
Physics: f = D_P/ 2 _ v2 L = 14.2/Re
Re = D v _ / _
Thus, from calculation:
v = 0.087 m/s
and, Re = 0.29
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