Temperature ("C)Q2) The nearby figure shows a plot of the1200 1000800 700 60050040010-8Culin Silogarithm (to the base 10) of the diffusioncoefficient versus reciprocal of absoluteAu in Si10-12temperature for the diffusion of several systemsAg in SiDetermine values for the activation energy and10-16the preexponential of Al-Si system.Al in Si10-2010-2410-280.60.81.01.2x 103Reciprocal temperature (1/K)1.4x 103x 103x 103x 103Diffusion coefficient (m2/s)

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Answered: Q2) The nearby figure shows a plot of…

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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Reconsider Prob. 14–22. Using EES (or other) software, plot the diffusion coefficient as a function of the temperature in the range of 200 K to 1200 K. Problem. 14–22 The diffusion coefficient of hydrogen in steel is given as a function of temperature as DAB = 1.65 × 10-6 exp(–4630/T) (m2 /s) where T is in K. Determine the diffusion coefficients at 200 K, 500 K, 1000 K, and 1500 K.
Calculate the diffusion constant, D, for the process at a diffusion temperature of T=1150 ⁰C given that D0 = 5.5 *10-5 m2/s; Qd = 148,000 J/mol.
Consider diffusion of hydrogen through a poly(dimethyl siloxane) (PDMSO) sheet 20 mm thick. If the permeability coefficient at 350 K is 1.31 x 10-10 [(cm STP)(cm)/(cm2-s- Pa)], compute the diffusion flux [(cm STP)/(cm2-s)) at 500 K. The hydrogen pressures at the two faces are 10 kPa and 1 kPa, which are maintained constant. Hint: Pw is the temperature independent coefficient i.e. it's the same for all temperatures. Use PM = PMo (- Qp / RT), Qp = 13.7 kJ/mol and R = 8.31 J/mol-K
The diffusion coefficients for iron in nickel are given at two temperatures: T (K) D (m2/s) 1273 9.4 × 10–16 1473 2.4 × 10–14 R is the ideal gas constant, 8.314 J/mol K. T is the absolute temperature in ____degrees K. _____ Determine the values of D0 and_____ the activation energy Qd. What is the magnitude of D at 1100ºC (1373 K)?
The diffusion coefficient of Ni in Cu at 1025 C is 10-9 cm2 s-1. How long does it take for the mean square root of the distance to be 1 cm?
Consider steady 2D diffusion through a funnel. The funnel radius varies linearly with the distance along the funnel axis according to the following formula: rx=r0*(1+x/L). r0 = 1mm, L=1cm.
The diffusion coefficients for metal A in metal B are given at two temperatures: T (K) D (m2/s) 1283 6.55 × 10–17 1543 6.43 × 10–16 Dtermine the activation energy (Qd), the value of Do and the magnitude of D at 1463 K?
A sheet of steel with 3.5-mm thickness has a nitrogen atmospheres on both sides at 900°C and is permitted to achieve a steady-state diffusion condition. The diffusion flux is found to be (1.0 ×10^-7 )kg/m^2×second.Also it is known that the concentration of nitrogen in steel at the high-pressure surface is 2 kg/m^3.How far into the sheet from this high-pressure side will the concentration be 0.5 kg/m^3?Assume a linear concentration profile.
A tanker ship is transporting 0.798 kg/m3 of a rare gas in its tank. After the fill-up, the 1.94 m long pipe used to fill the tank was left open for 10.4 hours. In that time, 11.7 x10-4 kg of the gas diffuses out of the tank, almost nothing compared to the original quantity of gas in the tank. If the concentration of that gas in our atmosphere is typically zero, and the diffusion constant of that gas is 2.13 x10-5 m2/s, what is the cross-sectional area of the pipe?
You want to carburize a steel drill bit in the presence of methane. The drill bit initially has a uniform carbon concentration of 0.25 wt% and is to be treated at 950 oC (1750 oF). If the concentration of carbon at the surface is suddenly brought to and maintained at 1.20 wt%, how long will it take to achieve a carbon content of 0.80 wt% at a position 0.5mm below the surface? (The diffusion coefficient for carbon in iron at this temperature is 1.6 x 10-11 m2/s.)
6. A sheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200C and is permitted to achieve a steady-state diffusion condition. The diffusion coefficient for nitrogen in steel at this temperature is 6  10-11 m2/s, and the diffusion flux is found to be 1.2  10-7 kg/m2-s. Also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3. How far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3? Assume a linear concentration profile.
[Decarburization] An FCC iron-carbon alloy initially containing carbon with the concentration, C0, is exposed to anoxygen-rich and virtually carbon-free atmosphere. Under the given conditions, the carbon diffuses from the alloy andreacts at the surface with the oxygen in the atmosphere, meaning that the carbon concentration at the surface position is maintained essentially at 0 wt% C. The subproblems are independent.(1) Determine the diffusion coefficient at the temperature T given below. Use T = 1250 °C(2) When the value of D is given below, what position will the carbon concentration be Cx after a treatment for thetime, t? Use D = 1.93 × 10−10m2 /s; C0 = 0.35 wt%; Cx = 0.11 wt%; t = 12 hr

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Q2) The nearby figure shows a plot of the logarithm (to the base 10) of the diffusion coefficient versus reciprocal of absolute temperature for the diffusion of several systems Determine values for the activation energy and the preexponential of Al-Si system.