a. Determine the diffusion coefficient for zinc diffusing into copper at 200°C. b. Create a plot showing diffusion coefficient vs. temperature for zinc diffusing into copper over the range of 0°C to 600°C. Include a minimum of six data points (you may use Excel for the repetitive calculations). What does the shape of the curve tell you about the dependence of diffusion rate on temperature? c. Determine the diffusion coefficient for nickel diffusing into copper at 200°C. Explain why the value differs from that found in Part a.

a. Determine the diffusion coefficient for zinc diffusing into copper at 200°C. b. Create a plot showing diffusion coefficient vs. temperature for zinc diffusing into copper over the range of 0°C to 600°C. Include a minimum of six data points (you may use Excel for the repetitive calculations). What does the shape of the curve tell you about the dependence of diffusion rate on temperature? c. Determine the diffusion coefficient for nickel diffusing into copper at 200°C. Explain why the value differs from that found in Part a.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Please kindly help. I will give a like. Thank you! a. Describe the S-curve model of diffusion on how does ‘rate of adoption’ change over time? At which-point is the rate of diffusion the fastest? b. S-curve model of diffusion: (true/false) and reasoning - k = 0, the rate of diffusion is instantaneous? - fixed k ≥ 0, the carrying capacity is determined only by the ratio of a and b? - fixed k ≥ 0, the rate of diffusion is determined only by the ratio of a and b? c. The diffusion of hybrid corn in the 1940s, who or which region seems to have adopted the hybrids more quickly and why?
Many biological tissues have layers with different extracellular matrix components and different orientations of these components. As a result, diffusion coefficients vary from region to region. Even within a region, the diffusion coefficient depends on the direction of transport, a situation know as anisotropy. Consider the steady-state, one-dimensional diffusion of a molecule across an artery wall consist of an acellular phase and a cellular phase. There are no chemical reactions. An example of such a tissue is an elastic artery that contains a layer of smooth muscle cells of thickness L1 and an elastic lamina of thickness L2. (Actually, an artery consists of repeating layers of elastin and smooth muscle cells, but for the present discussion, consider a single layer of each.) The molecule diffusion coefficients of the two layers are Di, 1 and Di, 2 respectively. The concentration of the molecule at the lumen surface (x = 0) is C0, and the concentration at x = L1 + L2 = L is CL. L1 =…
6. (20%) Pure zinc is to be diffused into the copper by dipping copper into molten zinc at 450°C. Calculate how long would take to obtain 10wt% zinc at a depth of 0.5 mm beneath the copper surface. Is this commercially feasible? What practical problems might arise if we raise the temperature to 1000°C ? Use Table below for error function values as needed. At 450°C, the diffusion coefficient D = 6.3 10-17 m²/s.
Thermal conductivity, temperature and heat flux in a solid are, respectively, analogous to mass diffusion coefficient, concentration and mass flux. Choose an option: Real or False
A mechanism for hardening steel is called carburization. To achieve this process, the piece of steel is exposed to an atmosphere rich in hydrocarbon such as methane (CH4). Consider a steel with a carbide concentration of 0.25wt%, which must be treated at 950˚C. If the carbon concentration at the surface is suddenly increased to 1.20wt%, how long does it take for a penetration of 0.5mm from the surface to reach a concentration of 0.80wt%? . The diffusion coefficient for carbon in iron at this temperature is 1.6 x 10-11 m2s-1. Assume that the piece of steel is semi-finite. Use the table below.
An FCC iron–carbon alloy initially containing 0.25 wt% C is exposed to an oxygen-rich and carbon-free atmosphere at 1400 K. Under these circumstances the carbon diffuses from the alloy and reacts at the surface with the oxygen in the atmosphere; that is, the carbon concentration at the surface position is maintained essentially at 0 wt% C. (This process of carbon depletion is termed decarburization.) At what position (x, in mm) will the carbon concentration 0.10 wt% after a 8-h treatment? The value of D at 1400 K is 6.9 x10-11 m2/s. Round your answer to 2 decimal place.
**JUST PART C PLEASE** The pressure in a pipeline that transports helium gas at a rate of 5 lbm/s is maintained at 14.7 psia by venting helium to the atmosphere through a 0.25-inch internal diameter vertical tube that extends10 ft into the air. Helium and atmospheric air are at 60F. The diffusion coefficient for a mixture of helium with air is 2.79 ft2/h at 77oF. Assume the mole fraction of helium in the atmosphere is negligible, and the mole fraction of air in the helium pipeline is negligible. Determine the following:(a) The mass flow rate of helium flowing to the atmosphere through the tube.(b) The mass flow rate of air that infiltrates into the pipeline.(c) The net mass flow rate in the vertical tube.
A student working 3.0m away from you in a chemistry lab performs an experiment which creates a bad odor. It takes a while for the smell to get to you (air currents negligible). You are able to move 2.0m further away from the source but the smell catches up with you in another 60 seconds. What is the diffusion coefficient in the air for the molecules you smell?
A practical example of steady-state diffusion is the purification of hydrogen gas where one side of a thin sheet of palladium is exposed to impure gas containing hydrogen, nitrogen, oxygen, and water vapor. Hydrogen selectively diffuses through the sheet and exits the other side as purified hydrogen, while the other gaseous species do not penetrate the sheet noticeably. Compute the amount of hydrogen (in kilograms per hour) that passes through a 6-millimeter thick sheet of palladium with surface area equal to 0.25 m^2 at 600 degrees C. The diffusivity (or diffusion coefficient) of hydrogen in palladium is 1.7 *10^-8 m^2/s. The concentration on the high-pressure side is 2.0 kg of hydrogen per cubic meter of palladium, and is 0.4 (same units) on the low-pressure side.
1. Immiscible components do not mix in the liquid phase, and each independently exerts its saturation pressure until they rach a certain phase they can form homogenous mixture? 2. It will be easier to separate the components of a vapor micture if they have the same concentration. True or False
1. At ordinary room temperature, it was found that specific heat ratio ‘k’ of air was 1.40. Estimate the R, Cp and Cv of air assuming that air content is solely composed of 21% of Oxygen and the rest is Nitrogen. Draw a figure or FBD that will support the problem. Explain each step by step formula.
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