Q) A) What is ordinary diffusion, thermal diffusion? Which of these is typically
ID: 2074266 • Letter: Q
Question
Q) A) What is ordinary diffusion, thermal diffusion? Which of these is typically of the most dominated?
surface A Surface B
B) What can you conclude about the concentration of species A and B on/ near surface A and surface B given the following concentration profiles in a stationary mixture? C) A steel part has an initial carbon content 0.05% on mass basis, it is be hardened in a furnace at 1400k by exposing it to a carbonising atmosphere for 15 hours, during this process the carbon content at exposed surface maintained at 0.015 at the operating furnace temperature the diffusion of carbon in steel dab =6.2 X 10^-12 m^2/s I. What heat transfer problem is this process analogous? Provide full description II. What is the penetration depth? What does this depth represent? III. What is the mass fraction of carbon 0.3mm below the surface? IV. What the depth, in mm, is the carbon content 0.5% on mass basis V. How long would it take, in hours, for mass fraction of carbon at depth 0.1 mm to reach 0.75 %? Q) A) What is ordinary diffusion, thermal diffusion? Which of these is typically of the most dominated?
surface A Surface B
B) What can you conclude about the concentration of species A and B on/ near surface A and surface B given the following concentration profiles in a stationary mixture? C) A steel part has an initial carbon content 0.05% on mass basis, it is be hardened in a furnace at 1400k by exposing it to a carbonising atmosphere for 15 hours, during this process the carbon content at exposed surface maintained at 0.015 at the operating furnace temperature the diffusion of carbon in steel dab =6.2 X 10^-12 m^2/s I. What heat transfer problem is this process analogous? Provide full description II. What is the penetration depth? What does this depth represent? III. What is the mass fraction of carbon 0.3mm below the surface? IV. What the depth, in mm, is the carbon content 0.5% on mass basis V. How long would it take, in hours, for mass fraction of carbon at depth 0.1 mm to reach 0.75 %? 06) A) What is ordinary diffusion, thermal diffusion? Which o s typlcally of the most dominated? surface A B) What can you conclude about the concentration of species A and B on/ near surface A and surface B given the following concentration profiles in a stationary mixture? C) A steel part has an initial carbon content 0.05% on mass basis, it is be hardened in a furnace at 1400k by exposing it to a carbonising atmosphere for 15 hours, during this process the carbon content at exposed surface maintained at 0.015 at the operating furnace temperature the diffusion of carbon in steel dab -6.2 X 10-12 mA2/s What heat transfer problem is this process analogous? Provide full description What is the penetration depth? What does this depth represent? What is the mass fraction of carbon 0.3mm below the surface? what the depth, in mm, is the carbon content 0.5% on mass basis How long would it take, in hours, for mass fraction of carbon at depth 0.1 mm to reach 0.75 %? 1. Il. IlI. V.
Explanation / Answer
(A)
Ordinary diffusion
It is a process in which highly energetic molecules moves from high concentration to lower concentration(less energetic).
Thermal diffusion
Thermal diffusion is same as the ordinary diffusion, but thermal diffusion is occur only when there is tempreture gradient in the medium.
Thermal diffusion is domionates over the ordinary diffusion because temprature gradient increases the movements of the molecules in the medium.
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