The diffusion coefficients for carbon in nickel are given at two temperatures are as follows:

At T= 600°C, D=5.5 × 10^–14 m²/s

At T= 700°C, D=3.9 × 10^–13 m²/s

(a) Determine the values of D₀ and Q_d.

(b) What is the magnitude of D at 850°C?

A 10 ft long double pipe heat exchanger consisting of a 1 in sch 40 (1.315 in OD, 1.029 in ID) inner pipe within a 4 in sch 40 (3.998 in ID) outer pipe uses chilled water to cool hot glycerin (the water flows in the annulus and glycerin in the inner pipe). The pipes are constructed of AISI 302 stainless steel. The mean velocities of the water and glycerin are 4 ft/s and 1.3 ft/s, respectively. If the average bulk temperatures of the water and glycerin are 45 ◦F and 180 ◦F, respectively, compute the overall heat transfer coefficient based on the outer area of the 1 in diameter pipe. Neglect fouling.

Discuss the different types of pool boiling phenomena.

Describe the different behavior regions associated with pool-boiling in terms of excess temperature.

Describe the differences, if any, between burn-out point and Leidenfrost point for pool boiling.

For pool boiling, which thermo-physical variable needs to be controlled to obtain a continuous curve in the heat flux vs. excess temperature plot?

Discuss at which point does nucleate boiling regime starts and ends.

Describe the reason(s) for lower heat transfer coefficients relative to natural convection when excess temperature exceeds the burn-out point in a heat vs. excess temperature plot.

Discuss the reason(s) why quality is relevant during operation of power plant low pressure turbines.

How are Nerf N-Strike Elite Dart's made? What manufacturing process is done?  

A) What are cryogenic materials? Show how ductile to brittle transition zone takes place.
Determine its applicability.
B) Distinguish between thermosetting and thermoplastics polymers.
C) Discuss the nitriding process.

The following questions are simply applications of Bernoulli’s principle. (Give complete sentences as Answers.)

Why is the draft in a fireplace better on a windy day?

What keeps a Frisbee in flight?

Why does your car lurch toward an oncoming truck as it passes by?

Why does the wind increase the size of water waves?

Why do waves form as water approaches the shore?

Explain flow separation and why it causes increase or decrease in drag

A 1.5-in-diameter bar has been machined from an AISI 1050 cold-drawn bar. This part is to withstand a fluctuating tensile load varying from 0 to 62 kip. Because of the ends, and the fillet radius, a fatigue stress-concentration factor Kf is 1.85 for 106 or larger life. Estimate the fatigue factor of safety based on achieving infinite life (use Modified Goodman criteria) and the yielding factor of safety. If infinite life is not predicted, estimate the number of cycles to failure (use Modified Goodman criteria).

Write an executive summary on Ernst-Merchant Chip Formation theory and its practical applications in machining industries. (Hints: draw the free-body diagram and the force circle at the cutting edge, label all important parameters, explain the theory based on the minimum cutting force; show its importance on energy consumption and economy in mass production. (2 pages, single space, single column); use an abstract, divide the paper in headings and subheadings, and a conclusion or final remarks (summing up).

Completely and thoroughly explain how Facilities Design could be used to design a new facility for a company that makes clothing. Discuss the issues of raw material deliveries at the receiving dock, unloading trucks and storing the raw materials, movement of raw materials to the manufacturing areas, monitoring and moving work-in-process throughout the manufacturing area, delivering finished goods to the warehouse, and consolidating customer orders for shipment. Be sure to focus your discussion on a company that makes clothing.

Completely and thoroughly explain how the concepts of Engineering Economy could be used to help a company that makes paper products make a decision on whether or not they should invest in new equipment. You will need to include more information that what is presented in the lecture transcript for Engineering Economy.

Completely and thoroughly explain how Total Product Costs would be calculated to determine the total cost to make an electric coffee maker for a company that makes a variety of small home appliances. Include as much detail as possible and do not simply discuss the broad major cost categories of direct materials, direct labor, and manufacturing overhead.

General Instructions Upload Matlab files for Assignment 8 to the appropriate link on Blackboard. Upload final Matlab files (YourINITIALSfilename.m), separately. Print program flowcharts, listings (a copy of the Matlab code) and requested sample runs, and submit each on the due date. Deliverables: For each program submit a flowchart, listing of the code, a sample run and the program’s Matlab (.m) file.

Problems: 1. The “filename” in YourINITIALSfilename.m for this program is “cylinder”. Create a flowchart and a corresponding Matlab program that outputs a hollow cylinder’s inner diameter, surface area and volume when a user enters cylinder height (h), outer diameter (d) and inner diameter as a percentage (p) of outer diameter. This program must prompt the user to accept any reasonable value for height, outer diameter and percentage (0-100%). In the submitted file after the listing for the final program, provide the results for one sample run of the program with h = 1 in, d = 2 in and p = 50%.

Air enters the compressor of an ideal air-standard Brayton cycle at 100 kPa, 300 K, with a volumetric flow rate of 5 m3/s. The turbine inlet temperature is 1800 K. For a compressor pressure ratio of 9, determine: (a) the percent thermal efficiency of the cycle. (b) the back work ratio. (c) the net power developed, in kW.

What material changes could advance the item leading?

(for example, to improvements in sustainability, accessibility, affordability, equity, performance, etc..)

Use materials property data and knowledge of materials selection strategies to support your proposed material innovation.

(Can you please not answer handwriting)