P7.26 Consider laminar flow past the square-plate arrangements in the figure below. Compared to the drag of a single plate (1), how much larger is the drag of four plates together as in configurations (a) and (b)? Explain your results. 1 3 2 4 1 2 3
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- Air at 1000C flows at an inlet velocity of 2 m/s between two parallel flat plates spaced 1 cm apart. Estimate the distance from the entrance to the point where the boundary layers meet.Air at 20C flows at 1 m/s between two parallel flat plates spaced 5 cm apart. Estimate the distance from the entrance to the point at which the hydrodynamic boundary layers meet.Problem 2: Consider laminar boundary layer flow past the square -plate arrangements in the figure below. Compared to the friction drag on a single square, how much larger is the drag of the four plates together as in configurations (a) and (b)? ↑ 1 (a) 1 2 3 4 1 2 (b) 3 4
- Based strictly on your understanding of the flat-plate theoryplus adverse and favorable pressure gradients, explainthe direction (left or right) for which airflow past theslender airfoil shape in Fig will have lower total(friction 1 pressure) drag.Air at 20°C and 1 atm fl ows at 50 ft/s past a thin fl at platewhose area (bL) is 24 ft2. If the total friction drag is 0.3 lbf,what are the length and width of the plate?f6
- Consider the equation v (t) = " (1 – e-le/m)t) For the free-falling bungee jumper with linear drag, assume a first jumper is 73.5 kg and has a drag coefficient of 12.5 kg/s. If a second jumper has a drag coefficient of 14.5 kg/s and a mass of 85 kg, how long will it take him to reach the same velocity jumper 1 reached in 8 s? (Round the final answer to three decimal places.)Air at free-stream velocity of 9 m/s flows over a thin flat plate of length 3 m and width 1.5 m. A laminar boundary layer develops from the leading edge of the flat plate. At Re. = 500 000, the boundary layer becomes a turbulent boundary layer where x is the distance from the leading edge. Pair = 1.2 kg/m², µair = 1.8 x 10$ kg/m.s (a) Estimate the length of the laminar boundary layer. (b) Estimate the drag force due the laminar boundary layer on one side of the flat plate. (c) Estimate the boundary layer thickness and wall shear stress at x = 2.5 m.3b
- Assume air at 20°C and atmospheric pressure on a smooth flat plate with a speed free current of 25 m/s (kinematic viscosity of 1.5x10-5 m2/s and density 1.2 kg/m3). The plate is 4 m long and 1.5 m wide. If the boundary layer is initially laminate and then become turbulent boundary layer with a transition Re of 5x10^5: a) What is the drag coefficient for the plate?b) What is the drag force on the entire plate?c) At what distance x from the plate the profile becomes turbulent.d) What is drag force on the turbulent part?e) What is the drag force on the laminar part?The drag polar equation of a light aircraft in clean configuration is: CD=0.020+0.044C₁2. The aircraft has a wing area of 162.7 ft² and a wing loading of 15.2 psf. It is flying at a velocity of 213 feet per second. Assuming steady level flight and SSLC (p=0.002377 slug/ft³), determine the drag force (in lb, nearest hundredths) being generated by the aircraft.Pls help on this question ASAP for a like