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.
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Why can't I use the sum of force(about y axis) =0 at point P? I used this method to get the tension in the cord at first of solution, but gotten wrong answer.
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Research and write a recommendation report that compares two or more things. Address a topic or issue of your major field of study.
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simplify washing machine by removing its design elements/parts one by one. How many parts did you remove until it does not work well? What are these parts? What can you say about the simplicity of the product?
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What is brake mean effective pressure (bmep)? Is it a
work term or is it a pressure term? Write the formula/equation for
bmep. Make a table of typical maximum values (range of values) of
bmep for various engines.
Note: In engine design calculations, the displacement required to
provide a given torque or power at a given speed can be estimated
by assuming appropriate values of bmep for that particular
application. Engineers typically remember these values.
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1.a Which meshing considerations are important to consider when performing a modal analysis?
1.b sing the Ansys command remote force is sometimes handy to apply a force to a model. In which case could precaution be appropriate and why
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1.a Show that you understand what element distortion is by explaining the general problem caused by too distorted elements and drawing ideally and distorted elements of the following types: a) Solid tetrahedron b) Solid hexahedron c) Triangular 2D-element d) Quadrilateral 2D-element
1.b What are the thermal analysis equivalent parameters, and their corresponding units, of the following structural parameters ?
a) D isplacement
b) Strain
c) Stress
d) Load
e) Essential boundary conditions
f) Elastic supports
In: Mechanical Engineering
1. Use Thwaites' method to find the separation point for flow across a infinitely long cylinder (BOUNDARY LAYER THEORY IN FLUID MECHANICS).
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Consider a simple ideal Rankine cycle which uses water as the working fluid. The boiler pressure is 6100 kPa and the condenser pressure is 30 kPa. At the turbine inlet, steam is at 480°C. The isentropic efficiency of the turbine is 92 percent. The pump losses are negligible and the water leaving the condenser is subcooled by 6.3°C. The boiler is sized for a mass flow rate of 20 kg/s. Determine the following values.
The temperature at the pump inlet.
°CThe specific volume at the pump inlet.
m3/kgThe specific enthalpy at the turbine exit.
kJ/kgThe rate at which heat is added in the boiler.
kWThe power required to operate the pumps.
kWThe net power produced by the cycle.
kW
The thermal efficiency.
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Consider a simple ideal Rankine cycle which uses water as the working fluid. The net power of power plant is 220-MW. At the turbine inlet, steam is at 9 MPa and 560°C. The condenser pressure is 20 kPa. Determine the following values.
The temperature at the pump inlet.
°CThe specific enthalpy at the pump inlet.
kJ/kgThe specific volume at the pump inlet.
m3/kgThe pump work.
kJ/kgThe temperature at pump exit.
°CThe specific entropy at turbine inlet.
kJ/kg·KThe quality of steam at turbine exit.
The temperature of steam at turbine exit:
°C. Now using calculated T and s values draw a T-s diagram to compare with the one in notes or textbook. You may use the plot_TS_water function. The thermal efficiency of the cycle.
%
The mass flow rate of the steam.
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1. Use the approximate integral method to find the pressure gradient at the inlet of a circular pipe (BOUNDARY LAYER THEORY IN FLUID MECHANICS);
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List 5 generic properties of polymers, and briefly relate these properties to the atomic structure of polymers.
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Consider the same TTT diagram and phase diagram for a eutectoid steel. TTT If a specimen of this steel is solutionized (aka, annealed to equilibrium) at 800°C, rapidly cooled to 300°C and is held at 300°C for 10 seconds, and is then quenched to room temperature, what constituents will make up the final microstructure? a. Bainite and Martensite b. Pearlite c. Martensite d. Austenite and Martensite e. Austenite f. Pearlite and Martensite g. Austenite and Pearlite h. Bainite
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Consider a two-dimensional triangular lattice described by the two primitive vectors (in an orthogonal coordinate system
Find the two primitive lattice vectors describing the reciprocal lattice. Find the area of the 1st
Brillouin zone and its relation with the area of the direct lattice unit cell.
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Consider a plane wall with uniform thermal energy generation per unit volume of qdot. Starting with the steady-state heat equation, obtain a general expression for the temperature distribution (Since no boundary conditions are provided, there will be unknown constants in the resulting equation).
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