1.解釋名詞(25%) (5)boundary layer thickness and momentum thickness

4. (20%) For a horizontal T through which water (density = 1000 kg/m3) is flowing, the following data are given: Q1-=0.25 m3/s, Q2=0.1 m3/s, p1=100 kpa, p2=70 kpa, p3=80 kpa, D1=15 cm, D2=7 cm, and D3=15 cm. For these conditions, what external forcein the x-y plane (through the supporting devices) is needed to hold this T in place?