Explain the failure criteria in 2-D stress-strain analysis.

Consider a 2-mm-diameter sphere immersed in a fluid at 300 K and 1 atm.

(a) If the fluid around the sphere is quiescent and extensive, show that the conduction limit of heat transfer from the sphere can be expressed as NuD,cond = 2. Hint: Begin with the expression for the thermal resistance of a hollow sphere, letting r2 →∞ and then expressing the result in terms of the Nusselt number.

(b) Considering free convection, at what surface temperature will the Nusselt number be twice that for the conduction limit? Consider air and water as the fluids.

(c) Considering forced convection, at what velocity will the Nusselt number be twice that for the conduction limit? Consider air and water as the fluids.

In a manufacturing system, 5 workers pick parts from a raw materials bin. After picking the parts, the workers move towards a cell that is composed of 5 manual turning machines. The workers then load the parts onto the machines and then starts the machining process. Once the workers are satisfied that the machining process is complete they stop the machines and unload the parts inspect the machined parts and when satisfied places the machines parts in a finished parts bin. The workers then load the waiting parts. The same activities are repeated on the manual lathes machines until the raw materials bin is empty.

For the manufacturing system described above:

1- Identify the various levels of automation in this system. Justify your answer.

2- Use the USA principle to identify opportunities for automating the manual system described above

3- Given that demand for the machined parts is very high, discuss a suitable automation migration strategy for this manufacturing system

Calculate the weight of steel saved if a 250 mile crude pipeline (class 2 location) operating at 1440 psia MAOP upgrades its steel from grade b (35,000 psi) to x-70. 16” Pipeline

i have to plot time and frequency domains and then calculate damping ratio for the underdamped system using the log decrement method then convert the time domain into frequency domain using the fourier transfor codes.

Liquid at 23 (degrees C) flows at 2 m/s over a smooth, sharp-edged, flat surface 12 cm in length which is kept at 57 (degrees C). Calculate h at the trailing edge

a) if the fluid is water

b) if the fluid is glycerin (h=346 W/m^2-K)

c) Compare the drage forces in the two cases

How does a commercial ice machine exactly work? Take Hoshizacki for example (MODEL KM-515MWH and MODEL KML-600MWH). They have both water-cooled and air-cooled models that make ice. I want to know how these machines work mechanically during a cycle to create ice. How should the time vs. kW graph look for a cycle? Can you label the diagram to show which parts are working during each phase? How would you also figure out how efficient machine is?

A brass rod 25.00 mm long and 5.00 mm in diameter extends horizontally from a casting at 200°C. The rod is in an air environment with T∞ =20°C and h=30 W/m2·K. What is the temperature of the rod 6.25, 12.50, and 25.00 mm from the casting?

Linear-elastic fracture mechanics method for fatigue life estimation is more appropriate for which stage(s) of fatigue?

a.Why might a single crystal ceramic material have different coefficients of linear expansion depending on the crystallographic direction (anisotropy)?

b. In metals, thermal expansion and electrical conductivity may be related using equation the Weidemann-Franz law. Why is it possible to relate these two phenomena in this way for metals and why does this relation not hold for ceramic and polymeric materials?

A hollow cylinder of ID 0.12 m and OD 0.14082 has a heat generation rate of 5 × 106 W/m3.
The conductivity of the material is 30 W/mK. The outside surface is insulated and heat is
removed by convection over the inside surface by a fluid at 130°C with a convection coefficient
of 226.26 W/m2K. Determine the temperature on the outside surface.

When reporting gait and/or kinematics data, authors report a continuous graph of the average and standard deviation. Research how this type of graph is created and write up a tutorial on how to create these types of graphs

A mixture of dry air and water vapour is at a temperature of 25C. It is under a pressure of 100kPa. The dew point temperature is 15C. What is:

a) Partial pressure of the water vapour?

b) Relative humidity?

c) Specific humidity?

d) Specific volume of the dry air?

Isooctane is supplied to a four-cylinder spark-ignition engine at 2 g/s. Calculate the air flow rate for stoichiometric combustion. If the engine is operating at 1500 rev/min, estimate the mass of fuel and air entering each cylinder per cycle. The engine displaced volume is 2.4 liters. What is the volumetric efficiency?