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An airplane uses a pitot-static tube as a velocimeter. The measurements, with their uncertainties, are a static temperature of
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Fluid Mechanics
- Air with density of 1.225 kg/m^3 and viscosity of 1.789x10^-5 kg/m-s flows in a wind tunnel, the wind tunnel speed is measured with Pitot tube probe. For a certain run, the stagnation pressure is measured to be 472.6 Pa gage and the statric pressure is 15.43 Pa gage. Calculate the wind tunnel speed.arrow_forwardA U-tube manometer indicates a pressure drop of 10 in. water across in an air filter. The air is at 26 C and a pressure of 60 lbf/in2 : (a) What is the pressure drop in lbf/in2 and in atm? (b) What percentage of error is introduced if the density of the air in the manometer leads is neglected. (Air density = 1.168 kg/m3 ) (g =32.17 ft/s2)arrow_forwardKnowing μ for air at 20 ° C from Table 1.4, estimate itsviscosity at 500 ° C by ( a ) the power law and ( b ) the Sutherlandlaw. Also make an estimate from ( c ) Fig. 1.6. Comparewith the accepted value of μ ≈ 3.58 E-5 kg/m ∙ s.arrow_forward
- As measured by NASA’s Viking landers, the atmosphereof Mars, where g ≈ 3.71 m/s 2 , is almost entirely carbondioxide, and the surface pressure averages 700 Pa. The temperatureis cold and drops off exponentially: T ≈ T o e - Cz ,where C = 1.3E-5 m - 1 and T o = 250 K. For example,at 20,000 m altitude, T ≈ 193 K. ( a ) Find an analyticformula for the variation of pressure with altitude.( b ) Find the altitude where pressure on Mars has droppedto 1 pascal.arrow_forwardZ\0 @ P 0:10 ZAIN IQ II. Quiz 2 Thermo.pdf Gas flowing through a diverging nozzle has at inlet section a temperature of 20 °C, pressure 120 kN/m² and velocity 300 m/s. At the outlet of the nozzle the velocity has fallen to 100 m/s. Assuming an adiabatic flow, what is the values of outlet pressure, temperature, internal energy and specific enthalpy at outlet section. Take y= 1.333 and Cv= 0.86 kJ/kg K.arrow_forwardAir is flowing in a duct with velocity of 7.62 m/s and static pressure of 2.16 cm water gage. The duct diameter is 1.22 m, the barometric pressure 99.4 kPa and the gage flt*d temperature and air temperature are 30 C. What is the total pressure against which the fan will operate in cm of water?arrow_forward
- Example 1.10 gave an analysis that predicted that theviscous moment on a rotating disk M = πμ V R 4 /(2 h ). Ifthe uncertainty of each of the four variables ( μ , Ω,, R , h )is 1.0 percent, what is the estimated overall uncertaintyof the moment M ?( a ) 4.0 percent ( b ) 4.4 percent ( c ) 5.0 percent( d ) 6.0 percent ( e ) 7.0 percentarrow_forwardHelium at 20 ° C has a viscosity of 1.97 E-5 kg/(m ∙ s). Usethe data of Table A.4 to estimate the temperature, in ° C, atwhich helium’s viscosity will double.arrow_forwardA storage tank, 26 ft in diameter and 36 ft high, is fi lledwith SAE 30W oil at 20 ° C. ( a ) What is the gage pressure,in lbf/in 2 , at the bottom of the tank? ( b ) How does your resultin ( a ) change if the tank diameter is reduced to 15 ft?( c ) Repeat ( a ) if leakage has caused a layer of 5 ft of waterto rest at the bottom of the (full) tank.arrow_forward
- Air with density of 1.225 kg/m^3 and viscosity of 1.789 x 10^-5 kg/m-s flows in a wind tunnel, the wind tunnel spped is measured with Pitot tube probe. For a certain run, the stagantion pressure is measured to be 472.6 Pa gage and the statric pressure is 15.43 Pa gage. Calculate the wind tunnel speed.arrow_forwardQ.2 An incompressible fluid (kinematic viscosity, 7.4x10-7 m2, 7.4×10 m/sec, specific gravity, 0.44) is held between two parallel plates. If the top plate is moved with a velocity of 0.5 m/s while the bottom one is held stationary, then fluid attains a linear velocity profile in the gap of 0.5 mm between these plates. The shear stress (in Pascals) on the surface of bottom plate is 2 0.3256 N/m A 0.4256 N/m C 0.5256 N/m2 2 D 0.6256 N/marrow_forwarda low-speed aircraft is flying at an altitude of 1500 meters. The outside air temperature measures 300 R and a pitot tube mounted on the wing tip measures a pressure of 1750 psf. What is the true velocity and the equivalent airspeed? What is the dynamic pressure and the total pressure?arrow_forward
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