What maximum temperature might be expected at the bottom of a well drilled within a relatively high-grade geothermal energy such as Lightning Dock geothermal resource in southwest New Mexico?
Please cite references
In: Mechanical Engineering
(a) Just like the familiar liquid solutions, two metal ions or
atoms combine to form solid solution. What are substitutional solid
solutions and interstitial solid solutions? Explain with examples
and sketches.
(b) How well the solid atoms combine to form solid solutions
depends on how many of the Hume-Rothery rules have been violated or
not violated. Describe Hume-Rothery rules?
In: Mechanical Engineering
A propane tank with 75 gallons of liquid propane is at 50 F in a
sealed tank. The tank develops a significant leak and propane
escapes and vaporizes in a short period of time. To solve this
problem you must use the propane tables not the common liquid
properties.
What is the temperature near the hole in the propane tank
due to the escaping propane in Fahrenheit to three significant
digits? . Include a minus sign if
appropriate.
How many Btus of energy are needed to vaporize the entire
75 gallons of liquid propane? . Give your answer to three
significant digits in Btus.
In: Mechanical Engineering
Do some internet research on the properties of composite materials. a) Compare the tensile strength of a typical glass fibre reinforced polymer with the tensile strength of a carbon fibre reinforced polymer. Make sure you the fibre lay-up is the same in your two examples and that you record what that is in your answer. Use data tables from reputable engineering or scientific web pages or material suppliers only and cite your reference(s).
Answer:....................................................................................................................... ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. b) Write a few lines about metal-matrix composites and how their properties compare with polymer based composites.
Answer:....................................................................................................................... ................................................................................................................................. ................................................................................................................................. .................................................................................................................................
In: Mechanical Engineering
Air at 20°C (1 atm) is flowing over a 0.025-m diameter sphere with
a velocity of 3.5 m/s. If the surface temperature of the sphere is
constant at 80°C, determine the Reynolds number corresponding to
the sphere, its average drag co-efficient, and the heat transfer
rate from the sphere. The properties of air (1 atm) at the free
stream temperature T∞ = 20°C, ρ = 1.204
kg/m3, k = 0.02514
W/m∙K, μ = 1.825 × 10−5 kg/m∙s,
and Pr = 0.7309. At the surface
temperature Ts=
80°C: μs = 2.096 ×
10−5 kg/m∙s. At the film
temperature Tf = (80°C + 20°C)/2
= 50°C: ρ = 1.092
kg/m3 and v = 1.798 ×
10−5 m2/s. (Round the Reynolds number to
the nearest whole number and other answers to two decimal
places.)
In: Mechanical Engineering
Look up today’s wholesale prices of natural gas in Texas (4.74 Dollars per thousand cubic feet) Calculate how much a kWh of electricity should cost, if it is being produced from (a) natural gas and (b) wind. You will need to worry about efficiency of combustion, energy content of natural gas, conversion of joules in kWh, etc. You will also need to figure out how to price wind, which of course blows for free.
In: Mechanical Engineering
For each of the product applications below answer the material design, requirement and selection questions using the following format.
a) List the desired material properties (not limited to mechanical properties) for the intended application
b) What are the typical materials that are used for the intended application? If you are unable to find an exact answer, predict the material category (such as metals/alloys, ceramics, polymers, composites etc.) that you would select.
c) What mechanical property would you test and using what choice of test (s) – both for checking the suitability of your chosen material and for product safety.
1) Turbine blades for a jet engine
2) Axle for Baja vehicle
3) Non-stick coating for a cooking pan
4) Protective cover/coating for a smart phone
5) Gears for wind turbine
6) Bearings
7) Bleachers
8) Body armor hard plates
9) Hockey puck
10) Underground fiber optic cables
11) Protective sheath for underground cables
In: Mechanical Engineering
Comparisons of quality aspects of metal casting processes .
In: Mechanical Engineering
What happens to a gas when it expands, specifically how do its properties change, include at least temperature, pressure, volume, enthalpy, entropy?
In: Mechanical Engineering
What are the materials that improved water accessibility? How did it improve water accessibility?
(Can you please not answer handwriting type it)
In: Mechanical Engineering
Exercise
Estimate the requirements of steam and heat transfer surface, and the evaporating temperatures in each effect, for a triple effect evaporator evaporating 500 kg h-1 of a 10% solution up to a 30% solution. Steam is available at 200 kPa gauge and the pressure in the evaporation space in the final effect is 60 kPa absolute. Assume that the overall heat transfer coefficients are 2270, 2000 and 1420 J m-2 s-1 °C-1 in the first, second and third effects respectively. Neglect sensible heat effects and assume no boiling-point elevation, and assume equal heat transfer in each effect.
Answer. A1 = 2.4 m2 = A2 = A3
Steam consumption: 0.35kg steam/kg water evaporated.
Note: Trial and error solution is not required here.
In: Mechanical Engineering
A strain hardened 360 brass sample that has been cold worked and
than placed into a furnace at 480 degrees C for 40 minutes. cooled
than poslished and etched.
What is the mechanism that allows for a change in microstructure
and mechanical properties due to annealing and
recrystallization?
In: Mechanical Engineering
1. Determine Atomic Packing Factor for HCP when atomic radius is r (show all works for full credits)
2. Determine Atomic Packing Factor for Rhombohedral when atomic radius is r and gamma (angle) is 120 degree (see slide 31, ch 4)
3. Determine Max Linear Densities for BCC and FCC (there are multiple)
4. Determine Max Planar Densities for BCC and FCC (there are multiple)
5. Determine Max Linear Densities on the max Planar Density planes from Q4, then compare them to Max Linear Densities from Q3. Explain.
In: Mechanical Engineering
Define fatigue. Mention some of the important parameters by which fluctuating stress cycles are characterized.?
In: Mechanical Engineering
Part A: Define actual and theoretical mechanical advantage, using words as well as equations.
Part B: What law of physics forbids the efficiency of an actual machine from being equal to 1? (100% efficiency)
Part C: What is the efficiency of a wooden ramp (μ =0.2) at an angle of 39 degrees?
Part D: Is a screw an example of a wheel and axle, lever, or inclined plane?
In: Mechanical Engineering