Question

In: Mechanical Engineering

Air flows through a 0.25-m-diameter duct. At the inlet the velocity is 300 m/s, and the...

Air flows through a 0.25-m-diameter duct. At the inlet the velocity is 300 m/s, and the stagnation temperature is 90°C. If the Mach number at the exit is 0.3, determine the direction and the rate of heat transfer. For the same conditions at the inlet, determine the amount of heat that must be transferred to the system if the flow is to be sonic at the exit of the duct.

Solutions

Expert Solution


Related Solutions

Air flows through a 8-in-diameter, 60-ft-long adiabatic duct with inlet conditions of V1= 550 ft/s, T01=...
Air flows through a 8-in-diameter, 60-ft-long adiabatic duct with inlet conditions of V1= 550 ft/s, T01= 650 R, and P1= 50 psia. For an average friction factor of 0.03, determine the velocity, temperature, and pressure at the exit of the duct. Please DO NOT merely copy other expert's work. I would like original work.
Air flows down a pipe with a diameter of 0.15 m. At the inlet to the...
Air flows down a pipe with a diameter of 0.15 m. At the inlet to the pipe, the Mach number is 0.1, the pressure is 70 kPa, and the temperature is 35°C. If the flow can be assumed to be adiabatic and if the mean friction factor is 0.005, determine the length of the pipe if the Mach number at the exit is 0.6. Also, find the pressure and temperature at the exit to the pipe.
Air is cooled from 300 K to 273 K as it flows steadily through a duct....
Air is cooled from 300 K to 273 K as it flows steadily through a duct. Frictional dissipation may be neglected. Cooling is achieved by removing heat via a heat pump. The work requirement is 1.15 times that of a reversible heat pump operating between 263 and 310 K. For each mole of air flowing through the duct, calculate: Air can be assumed an ideal gas with a constant heat capacity cP of 3.50R. The temperature of the surroundings is...
The mean velocity in an artery of internal diameter 2.5 mm is 0.25 m/s. Assuming that...
The mean velocity in an artery of internal diameter 2.5 mm is 0.25 m/s. Assuming that blood has a viscosity of 0.004 Pa.s and a density of 1000 kg m−3. a) Determine: i. whether the flow is laminar or turbulent ii. the volume flow rate through the artery b) Assume that the diameter of this blood vessel above is doubled, what would happen to the total volumetric flow rate? Explain your response. c) What would happen in terms of type...
Air at 25°C flows over a 10-mm-diameter sphere with a velocity of 20 m/s, while the...
Air at 25°C flows over a 10-mm-diameter sphere with a velocity of 20 m/s, while the surface of the sphere is maintained at 75°C. What is the rate of heat transfer from the sphere? q = ___ W ? Please provide correct final answer for guaranteed thumbs up rating !
Air flows through a constant area duct. The pressure and temperature of the air at the...
Air flows through a constant area duct. The pressure and temperature of the air at the inlet to the duct are P1 = 100 kPa absolute, and T1 = 298 K, respectively. Inlet Mach number is M1 = 0.1. Heat is transferred to the air as it flows through the duct and as a result the Mach number at the exit increases. Write a Matlab code and plot the following: a) Find the pressure and temperature at the exit, while...
Hot air flows with a mass flow rate of 0.05 kg/s through an insulated square duct...
Hot air flows with a mass flow rate of 0.05 kg/s through an insulated square duct with side of 0.15m, the hot air enters at 103 oC and after a distance of 5m, cools to 85 oC. The heat transfer coefficient between the duct outer surface and the ambient air (Tair = 0 oC) is 6 W/m2 K. Calculate the heat transfer coefficient between hot air and duct inner wall. Air Cp = 1.011 KJ/kg K; air k = 0.0306...
Air flows through a pipe that has a length of 45 m with an inside diameter...
Air flows through a pipe that has a length of 45 m with an inside diameter of 0.025 m. The Mach number of the flow exiting the pipe is 0.26, with a static pressure of 1 atmosphere and a temperature of 300 K. If the friction factor is assumed constant at 0.007, calculate the Mach number, static pressure, static temperature and total pressure at the entrance.
Air flows into a commercial steel pipe of 5 cm ID at 70 m/s. The inlet...
Air flows into a commercial steel pipe of 5 cm ID at 70 m/s. The inlet pressure and temperature of the air are 1 MPa and 100?C, respectively. a) Determine the Mach number at a distance 60 m down the pipe if the flow is adiabatic. b) Calculate the temperature at the same point. How would you comment on the assumption of constant Re, hence constant f, along the pipe by considering the temperature variation?
Air flows in a pipe with a diameter, D=50 mm. The inlet conditions are: M1 =...
Air flows in a pipe with a diameter, D=50 mm. The inlet conditions are: M1 = 3; total pressure, P01 = 1000 kPa absolute; and temperature, T1 = 550 K. The friction coefficient is, f = 0.004. The exit Mach number decreases with the length of the pipe. Plot the following while the exit Mach number to be changed from 2.5 to 0.99 with decrements of ?M=0.01: a) L, length of the pipe that is going to give the desired...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT