1 – Calculate the adiabatic flame temperature of propane combustion with 50% excess air.
2– Use an online adiabatic flame calculator to calculate the adiabatic flame temperature of propane with air in increments of 0.1 equivalence ratio from 0.5 to 1.2. Plot your results and determine the point that the flame has the maximum T. Compare your results with that of Problem 1.
In: Mechanical Engineering
A rigid tank of volume 0.63 m3 initially has some air inside at 0.5 bar and 300 K. A hole develops in the wall, and air from the surroundings at 1 bar, 300 K flows in until the pressure in the tank reaches 1 bar. Heat transfer between the contents of the tank and the surroundings is negligible. Determine the final temperature in the tank, in K. What is the entropy generation of the process? (Please treat the air as ideal gas with cp=1.001 kJ/kg?K and cv=0.714 kJ/kg?K)
In: Mechanical Engineering
True or False:
1. Keys are used to enable transmission of torque from the shaft to the shaft supported elements.
2. For the same bore diameter, a cylindrical roller bearing generally has a lower load carrying capacity than ball bearings.
3. Thrust bearings are suitable for supporting both axial and radial loads.
4. Typical bearing failures are due to excessive static stresses.
5. According to the seminar presentations, materials for joint replacements are selected on basis of the loading as well as their biocompatibility.
6. According to the seminar presentations, microturbine shafts are supported on air bearings?
In: Mechanical Engineering
a. Conduct an analysis for a gas turbine combustor using Propane, C3H8, you can assume the product outlet temperature is 1500 K and the air inlet temperature is 650 K on a standard day (25 C) and the fuel enters at ambient temperature.
In: Mechanical Engineering
How does the crystal structure influence friction? Why do FCC metals have more friction than HCP metals?
In: Mechanical Engineering
designing a boiler in a chemical plant which is operated on twolevel L1 and L2 and two temeprature settings T1 and T2 ....L1: start inlet valve for fluid to flow in tank , L2 : stop inlet valve, T1 and T@ are the safe temperature range for some operation consider you as system engineer depending on follwing > promram development safe systes commiossioning fault finding sytem documentation What are the necessary action and feature you will add to task for the safe operation of boiler
In: Mechanical Engineering
a. Write down the formula for the coefficient of performance (COP) of refrigerator.
b. Describe characteristics of the Carnot refrigeration cycle.
c. Write down the formula for the efficiency of reversible heat engine.
In: Mechanical Engineering
Nitrogen at 500 KPa, 500K is in a 1m3 insulated tank connected to a pipe with a value to a second
insulated initially empty tank of 0.5m3. The value is opened and the nitrogen fills both tanks. Find the
final temperature, pressure and the entropy generation this process causes.(the gas constant of nitrogen is R=0.2968 KJ/Kg?K)
In: Mechanical Engineering
Derive the 2nd order accurate finite difference approximation for the 1st derivative of a function at the data point Xo. That is, find the coefficients a, b, c such that: af(Xo) + bf(X1) + cf(X2) = f'(Xo) + O(h^2). (Note: there is a prime sign on the f'(Xo) at the right side)
In: Mechanical Engineering
Using a Dyno-mite dynamometer in a Chevrolet 4.3-liter V6 Engine, Explain how fuel consumption,brake thermal efficiency, and brake specific fuel consumption vary with load, speed, and coolant water temperature.
In: Mechanical Engineering
5 of industrial examples : with picture
-pressure relieve valve
In: Mechanical Engineering
5 of industrial examples : with picture
-tensile spring
- toresion spring
In: Mechanical Engineering
5 of industrial examples :(with photo)
-compression spring
In: Mechanical Engineering
The project is to "Design and build an experiment to verify the first law of thermodynamics by stirring air with an electric motor powered paddle, in a well-insulated container." We are planning on finding the work of the motor and seeing if it equal to the change in internal energy of the container. The only problem is that we are confused on how to find the internal energy. What would be the best/easiest way to solve this? Also since the containor is well insulated does that mean that the deltaQ would equal 0?
Thank you very much!
In: Mechanical Engineering
A small gas bubble grows in a large container of a Newtonian fluid. As the bubble grows, it pushes liquid away radially. We can ignore the inertia in the liquid, i.e. Re is small. By solving for the flow in the liquid and using the boundary condition at the bubble/liquid interface, we can determine how the bubble growth rate, i.e. the bubble radius R as a function of time, depends on the pressure in the bubble and liquid parameters.
a) Use the continuity equation to find the form of the radial velocity profile in the liquid.
b) Substitute your result into the r-component of the Stokes equation to show that the pressure in the liquid is constant everywhere! Call that pressure p?.
c) write the boundary condition at the bubble/liquid interface, i.e. at r = R. Hint: ignore surface tension so that the condition at the interface becomes the normal stress ?rr must be continuous there. The normal stress on the bubble side is ?rr = -pb, where pb is the pressure inside the bubble.
In: Mechanical Engineering