Air at 20 C flows over a flat plate with a velocity of 13 m/s. At the leading edge of the plate there is a trip wire. What is the shear stress on the plate a distance of 2.68 cm from the leading edge? the plate is 0.5 m long. O 0.97 Pa O 0.48 Pa O 0.63 Pa 0.82 Pa
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- 5. Water flows over a L=0.3 m long plate at 1.2 m/s velocity and 3°C temperature. There is a correlation between the water temperature and the plate surface temperature as Ts(x) -T=Cx0.75 across the plate (C = 54.27 °C/m0.75). The surface temperature varies throughout the plate. Find the average heat transfer coefficient for this case.A thin metal sheet serving the purpose of an an anemometer has a length of 2.5 cm with a width of 8 mm. Wind with a temperature T, and velocity Uz blows parallel to the longest side of the sheet. The metal sheet is heated through a solar powered system giving our heat both sides at Q Watts. The anemometer is used in air with T,= 20C, C, = 1.005KJ/Kg K, v = 1.522 X 105 m2/s, p = 1.19 Kg/m³ and Pr = 0.72. The surface temperature, T, of the metal sheet was measured at the rear end however, it can be assumed to be constant. You are required to calculate an estimate of the wind speed when T = 32 °C and Q = 0.5 W.) A 75 mm-diameter orifice is on the verticalside of a closed tank. The tank rests on a flat groundand the orifice is 0.5 m above the ground. Filled withfour fluids with air on the topmost portion that is undera pressure of 15 KPa, and the rest of specific gravities of0.80, 1.0, and 1.50, respectively, the jet hits the groundat a horizontal distance of 3.75 m. If the liquids have thesame thickness, and the power lost in the system is 233watts, determine the following:(a) The initial discharge in L/s if C=0.63.(b) The thickness of each liquid in m.(c) The coefficient of contraction.
- For axial flow through a circular tube, the Reynolds numberfor the transition to turbulence is approximately 2300 based on the diameter and average velocity. Ifd= 5 cm and the fl uid is kerosene at 20 ° C, fi nd the volumeflow rate in m 3 /h that causes transition.1. In laminar flow, which is correct?BJ: higher Re value has higher friction factorJB: lower Re value has higher friction factorGroup of answer choices A. BJ is false and JB is true B. BJ is true and JB is false C. BJ is false and JB is false D. BJ is true and JB is true 2.In turbulent flow, which is correct?BJ: higher Re value has lower friction factorJB: lower Re value has higher friction factorGroup of answer choices A.BJ is true and JB is true B.BJ is false and JB is false C. BJ is false and JB is true D. BJ is true and JB is false 3. In a system with 4 reservoirs and 1 pipe junction, how many continuity equations are formulable?Group of answer choices A. 2 B. 3 C. 5 D. 4 E. 1A thin flat plate ( 45 cm X 90 cm ) is immersed in a stream of glycerin ( ρ = 1258 kg/m3 and μ = 1.49 Pa.s ) with a velocity of ( 7 m/s ). Compute the skin frictional ( viscous ) drag exerted on the upper surface of the plate, if : a) The plate side parallel to the stream is the shortest side b) The plate side parallel to the stream is the longest side You may use the following relations: CDlam = 1.328 / ReL^(1/2) CDturb = 0.072 / ReL^(1/5)
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- A Pitot tube on an airplane flying at standard sea level reads 26kPa. What is the velocity of the airplane (in m/s)? Assume that psea-level = 1.3 kg m O 100 O 200 400What is the friction factor (to three decimal places) of the flow of air (density 1.2 kg/m³, viscosity 1.7 x 10-5 kg/ms) through a smooth pipe of diameter 0.1m at a mean flow speed of 1m/s.Water steadily through a reducing pipe bend. Kriown conditions are p1 850 3 KPa atisolute, D1 -25 cm, VI 2.2 m/s, p2-120 KPa atsolute, and b2 -8 cm Neglecting bend and water weight, estimate the total force which must be resisted by the nange bolts. P 101.3 kpa atm