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What is the definition of the streamline and what are its uses? What is a perfect gas and what is the perfect gas equation of state?
Determine the nature of the first phase change that eventually occurs in the system as a result of this process, and b. determine the pressure st which this phase change occurs.
What is the skin friction coefficient and how does it vary over a flat plate (laminar and turbulent)? What is the effect of compressibility on skin friction?
The air temperature is maintained constant at 25 oC during this process as a result of heat transfer to the surroundings at 17 oC. Determine the entropy chang
What is separation and what causes it? What are the differences between laminar and turbulent flow and their respective boundary layers?
If the duct surface temperature is maintained constant at 400 K, calculate the heat transfer to the air and the exit air temperature.
What does the area-velocity relationship tell us about flow in a supersonic wind tunnel? What is the throat, and what is its critical property?
A refrigerator in a kitchen at 20 degrees celcius uses R-134a. The freezer is to be kept at -5 degrees celcius or cooler. What is the maximum pressure that can be used in the evaporator? Why?
Assume that the ammonia is an ideal gas. Find the outlet temperature of the gas and the work consumed by the compressor. For this problem, take the Cp=4.269R, where R is the gas law constant.
What is the difference between the true airspeed and the equivalent airspeed? What are the differences between subsonic and supersonic wind tunnels?
Steam enters a two-stage adiabatic turbine at 8 MPa and 550ºC (State 1) and is expanded to 2 MPa. Calculate the mass flow rate (kg/s) through the two-stage turbine.
What are the key differences between incompressible subsonic flow, compressible subsonic flow, transonic flow, and supersonic flow, and what are the approximate boundaries of these regimes?
An electric heater in the form of a horizontal disk of 57 mm diameter is used to heat the bottom of a tank filled with engine oil at a temperature of 5 degrees celcius.
What are the two types of specific heat and how do they relate to energy and enthalpy? How do the ratio of specific heats, the gas constants, and specific heats relate to one another?
The mass flowrate of the condenser cooling water, in kg/hr if the cooling water enters the condenser at 15C and exits at 35C with negligible pressure change.
What is the difference between steady and unsteady flow? What is Bernoulli's equation and what assumptions are required for it to be valid?
In an actual refrigeration cycle using R-12 as the working fluid, the refrigerant flow rate is 0.05 kg/s. Vapor enters the compressor at 150 kPa, ?10°C, and leaves at 1.2 MPa, 75°C.
Find the power curve for the turbine. Illustrate the power curve together with one for which Cp always equals Cp,max (until reaching rated wind speed).
A horizontal, insulated cylinder has a frictionless piston held against stops by an external force of 500 kN. The piston cross-sectional area is 0.5 m2, and the initial volume is 0.25 m3. Argon gas
The system under consideration is an electronic circuit board, oriented vertically in 27 degree C air. Calculate the circuit board temperature for each case to see which option gives the best results.
A mass density of 640 kg/m3. The rotor turns at 120 rpm. Ignoring other potential problems, are any flapwise vibration problems to be expected? Explain.
A slab of aluminum of area 2m^2 and with a mass 9 kg is lying on some insulation on the surface of the moon during daytime and is equilibrated at a temperature To= 140 degrees C.
Saturated water vapor at 200 kPa is in a constant pressure piston cylinder. At this state the piston is 0.1 m from the cylinder bottom. How much is this distance and the temperature if the water is
Determine the mass of methane gas stored in a 2 m3 tank at ?30°C, 3 MPa. Estimate the percent error in the mass determination if the ideal gas model is used.
An engine operates on the air standard diesel cycle with inlet air conditions of 77 F and 14.5 psia. The compression ratio is 16, and the heat added is 700 Btu/lbm. Determine the max temp and pressu