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Determine a) the air exit velocity to produce 5lbf b) the volumetric flow rate needed, and c) the minimum mechanical power that must be supplied to the airstream. Take the air density to be .078 lb
The surface of the plate has an emissivity of .6. the critical renolds number is 5x10^5 for the flow. Find the heat transfer rate rom one side of the plate in watts.
An SAE 4140 OQT 1000 sleeve is to be secured to a solid pin of the same material with an actual diametral interference of 0.005 inch.
The average convection heat transfer coefficent of the air flow around it is 100 w/m^2 times K. find the amount of heat removed in Watts by a fin of = legenth but twice the diameter under similar co
Calculate the average density of an interply hybrid beam containing m layers of IM7 carbon fiber- epoxy and n layers of E-glass fiber-epoxy.
This type of device is isobaric. Assume the device is adiabatic and neglect kinetic and potential energy changes: h(tot) = h. What is the mass flow rate of liquid water?
A piston-cylinder device with a piston surface area of 0.1m^2 is initially filled with 0.05m^3 of air at the local atmospheric pressure and temperature. Find the friction force acting on the piston.
Argon at 2MPa and 500oC enters an isentropic turbine. The temperature of argon at the outlet is 20oC. Determine the outlet pressure and the specific work produced by this turbine.
Determine the entropy change of the surrounding. Will this process occur or not according to the second law of thermodynamics?
After a process, the pressure and temperature in the tank change to 200kPa and 400oC. Determine the entropy change of the water.
Saturated water at 10 bar will be supplied to the shell side of the heat exchanger. For steady-state operation, determine the effectiveness and NTU values of the heat exchanger.
The moist air is then passes through the heating unit. In the heating unit the moist air is heated to 24 oC without adding any moisture. Show the processes on a schematic psychometric chart.
The water flow into the boiler can be assumed saturated liquid. The fuel capacity is 35 MJ/Liter and it costs 0.15 dollar per liter. How much will the kilowatt-hour cost?
What size pump is needed to raise water at the rate of 2 gallons/minute from a sump up to 30-ft to be discharged into a storm sewer?
Nitrogen flows without gain or loss of heat through a horizontal duct find the head loss in BTU/lb. The change in enthalpy between sections 1 and 2. (assume nitrogen is a perfect gas)
Determine the minimum force P to get to move and if the barrier will slide or tip first. The concrete has a specific weight of 0.024 N/cm3 and the coefficient of static friction is 0.45.
If the surface of the tower is normally kept at 23 Celcius at night and has a emissivity of 0.64, what is the amount of heat loss due to radiation?
What is the heat transfer rate through conduction in Watts. The walls are 9 ft hight and the room has the dimension of 16 ft by 19 feet and the walls.
The iron block eventually reaches thermal equilibrium with the lake water. Assuming an average specific heat of 0.45 kJ/(kg-K) for the iron, determine the entropy change of the iron block?
Show the cycle on a T-S (temp. vs specific entropy) diagram relative to the 2-phase region and indicate, with arrows, the directions of working fluid flow.
Determine the rate of heat addition and rejection for this Otto cycle when it produces 179 hp and the cycle is repeated 1040 times per minute.
Steam enters an adiabatic turbine steadily at 3 MPa and 400 deg C and leaves at 70 kPa and 100 deg C. if the power output of the turbine is 2 MW (mega watt), determine the isentropic efficiency of
Aluminum Oxide (Al2O3) has a surface energy of 1 J/m2, estimate the maximum amount of energy (J/g) that is available for densification for spherical particles with a diameter of 1 micron.
What is the difference between Ideal Materials and Real Materials? Is there a difference in strength and why do we see this difference?
What is the horsepower delivered to the plant? do not neglect friction. If all the friction is converted to heat, what will the rise of temperature in the water?