A flat plate (isothermal, T0) has fluid (laminar, Uinf, Tinf) flowing over it. The local friction coefficient at distance, L, from the leading edge is 0.005. Assuming Pr=4.5, what is the local Nusselt number at this same distance, L?
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A flat plate (isothermal, T0) has fluid (laminar, Uinf, Tinf) flowing over it. The local friction coefficient at distance, L, from the leading edge is 0.005. Assuming Pr=4.5, what is the local Nusselt number at this same distance, L?
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- QI/ If the velocity profile of the boundary layer is 4 =-÷O find the thickness of boundary %3D layer, the shear stress at trailing edge and the drag force on one side of plate 2 m long , i if it is Kg immersed in water flowing with velocity of 0.4 m/s (p = 998 , 0= 1.007*10-6 m2/s m3(b) In two dimensional boundary layer, shear stress was changed linearly from the solid surface toward y-axis until it reach the value of zero at y = 6. Based on Table 2 and setting given to you; () Derive the equation of displacement thickness and momentum thickness using Von Karman Approximation Method ; and (ii) Determine the accuracy of this method in determining the value of displacement thickness and momentum thickness. Table 2 : Equation of Velocity Profile Setting Equation wU = 3(y/8)/2 – (y/8j?/2QI/ If the velocity profile of the boundary layer is :O find the thickness of boundary layer, the shear stress at trailing edge and the drag force on one side of plate 2 m long, if it is immersed in water flowing with velocity of 0.4 m/s (p 998 D = 1.007*10-6 m2/s %3D
- (b) In two-dimensional boundary layer, shear stress was changed linearly from the solid surface toward y-axis until it reaches the value of zero at y = 8. Based on Table 2 and setting given to you; (i) Derive the equation of displacement thickness and momentum thickness using Von Karman Approximation Method; and (ii) Determine the accuracy of this method in determining the value of displacement thickness and momentum thickness. Table 2: Equation of Velocity Profile Equation u/U = 3(y/8)/2 – (y/8)³/2 Setting 2(b) In two-dimensional boundary layer, shear stress was changed linearly from the solid surface toward y-axis until it reach the value of zero at y = 8. Based on Table 2 and setting given to you; (i) Derive the equation of displacement thickness and momentum thickness using Von Karman Approximation Method ; and (ii) Determine the accuracy of this method in determining the value of displacement thickness and momentum thickness. Table 2: Equation of Velocity Profile Equation u/U = 3(y/S)/2 – (y/8)³/2A ship is 125 m long and has a wetted area of 3500 m2.Its propellers can deliver a maximum power of 1.1 MWto seawater at 20°C. If all drag is due to friction, estimatethe maximum ship speed, in kn.
- The so-called Rocket Man, Yves Rossy, fl ew across the Alps in2008, wearing a rocket-propelled wing-suit with the followingdata: thrust = 200 lbf, altitude = 8,200 ft, and wingspan = 8 ft(http://en.wikipedia.org/wiki/Yves_Rossy). Further assume awing area of 12 ft2, total weight of 280 lbf, CDq = 0.08 for thewing, and a drag area of 1.7 ft2 for Rocket Man. Estimate themaximum velocity possible for this condition, in mi/h.A 5,000 lb airplane with wing area of 250 sq. ft and power available of 450 hp is at sea level flight standard condition. The airplane drag-to-lift relation is close to Co = 0.025 + 0.048 CL². What is the rate of climb (in feet per minute) at a flight speed of 180 miles per hour?QuestionNo.3 An approximated velocity profile for a laminar boundary layer is given as u(y) × Usin| 28 where U is the stream velocity far from the wall and 8 is the boundary layer thickness, as shown in Fig 2. If the fluid is helium (µ = 1.94 × 10-5N.s/m²) at 20°C and 1 atm, and if U = 10.8 m/s and ô= 3 cm, %3D use the formula to (a) Estimate the wall shear stress Tw in N/m2, and (b) Find the position in the boundary layer where t is one-half of Tw 2/2 U y = 8 u(y) Figure 2