A thin flat plate 55 cm × 110 cm is immersed in a 4.20 m/s s…

A thin flat plate 55 cm × 110 cm is immersed in a 4.20 m/s stream of SAE 30 oil at 20∘C20^\circ C. Assume laminar flow over the plate. Which pair correctly represents the total friction drag when the flow is aligned with: (1) the long side, and (2) the short side? (long side, short side)

Heat exchangers often consist of many triangular passages. C…

Heat exchangers often consist of many triangular passages. Consider the triangular duct shown in the figure with:   L=62.0 cm a=2.0 cm, β=80 deg L = 52.0\ \text{cm}, \qquad a = 2.0\ \text{cm}, \qquad \beta = 80^\circ The average fluid velocity is V=2.0 m/sV = 2.0\ \text{m/s} The fluid is SAE 10 oil at 20∘C20^\circ\text{C}, with properties ρ=870 kg/m3,μ=0.104 kg/(m.s)\rho = 870\ \text{kg/m}^3, \qquad \mu = 0.104\ \text{kg/(m\cdot s)} Estimate the pressure drop Δp\Delta p in Pa through the triangular passage.      

Air at 20 C and 1 atm flows at 28.90 m/s over a flat plate o…

Air at 20 C and 1 atm flows at 28.90 m/s over a flat plate of length 6 m. A narrow scoop is placed at the end of the plate to extract 4 kg/s per meter width. Which combination correctly gives: (1) the required scoop heigh h, and (2) the drag force per meter width on the plate up to the scoop?