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Calculate the air temperature and pressure at the stagnation point right in front of a meteorite entering the atmosphere (-50 °C, 50 kPa) with a velocity of 2000 m/s. Do this assuming air is in
What is meant by toughness? How does it differ from strength? Why is there a transition from ductile to brittle behavior at a transition crack length, ccrit?
A small pump is driven by a 2 kW motor with liquid water at 150 kPa, 10°C entering. Find the maximum water flow rate you can get with an exit pressure of 1 MPa and negligible kinetic energies.
What is the minimum number of (2m x 3m) plates required for this design? Neglect kerf loss and restrict welding to only the flange web junction.
An ideal gas Carnot cycle with air in a piston cylinder has a high temperature of 1200 K and a heat rejection at 400 K. During the heat addition the volume triples. Find the two specific heat trans
The virial equation of state for n-butane at 460K is Z=1+A/V+B/V^2 in which A =-265 cm^3/g and B= 30250 cm^6/(g*mole^2).
A nozzle receives 0.1 kg/s steam at 1 MPa, 400oC with negligible kinetic energy. The exit is at 500 kPa, 350oC and the flow is adiabatic. Find the nozzle exit velocity and the exit area.
A tank has two rooms separated by a membrane. Room A has 1 kg air and volume 0.5 m3, room B has 0.75 m3 air with density 0.8 kg/m3. The membrane is broken and the air comes to a uniform state. Find
Plot schematics of stress vs strain and stress vs. strain rate for (i) creep deformation, (ii) superplastic deformation, and (iii) high strain rate deformation typical of forging and extrusion.
In moles of an ideal gas A ad (1-n) moles of an ideal gas B, each at 1 atm pressure, are mixed at total constant pressure. What ratio of A to B in the mixture maximizes the decrease in the Gibbs fre
Assuming an axial velocity at the eye of the impeller, an impeller tip diameter of 33cm, a slip factor of 0.90 and a power input factor of 1.04, calculate the rotational speed required fo the centri
A composite is made up of 40% of filaments 100 mm in diameter of strength 3 GPa in a matrix of strength 80 MPa. The interfacial bond strength is 60 MPa. Determine the composite breaking strength if
A steam power plant operates with a boiler output of 20 kg/s steam at 2 MPa, 600°C. The condenser operates at 50°C dumping energy to a river that has an average temperature of 20°C.
What are the temperature on the left edge of the wall, the maximum temperature in the wall, and the heat flux q'' in kw/m^2 going through the right side of the plate?
A Rankine cycle operating with ammonia is heated by some low temperature source so the highest T is 120oC at a pressure of 5000 kPa. Its low pressure is 1003 kPa and it operates with one open feed w
The work on the system is measured as 200KJ per Kg of water vapor flowing. Determine the isentropic turbine efficiency.
A heat engine receives 1 kW heat transfer at 1000 K and gives out 600 W as work with the rest as heat transfer to the ambient. What are the fluxes of exergy in and out?
The reheated steam is then expanded in the low-pressure turbine to 10 kPa. Determine the steam flow rate to the high-pressure turbine and the power required to drive each of the pumps.
A piston-cylinder contains 1.2 kg of saturated water vapor at an initial temperature of T1 = 200 oC. Is a process that is internally reversible and adiabatic necessarily isentrop
A compressor is used to bring saturated water vapor at 1 MPa up to 17.5 MPa, where the actual exit temperature is 650°C. Find the isentropic compressor efficiency and the entropy generation.
Consider an ideal gas-turbine cycle with two stages of compression and two stages of expansion. The pressure ratio across each compressor stage and each turbine stage is 8 to 1.
A steam turbine inlet is at 1200 kPa, 500oC. The actual exit is at 300 kPa with an actual work of 407 kJ/kg. What is its second law efficiency?
Sketch ball temperature versus time for 0(b)Find the expression for the ball temp as a function of time,T(t), and plot the ball temp for 0.
A heat pump has a coefficient of performance of 2 using a power input of 2 kW. Its low temperature is To and the high temperature is 80oC, with an ambient at To. Find the fluxes of exergy associate