Diffusion. Chapter 5. Mechanics of Diffusion. Primary method by which atoms mix Consider a drop of food coloring in a glass of water. Atoms are always in motion. Bulk motion Random motion of individual atoms Vibration. Where does Diffusion Occur in Crystals?. Through Interstitial SpacesBy ace
Diffusion Mass Transfer. Chapter 14 Sections 14.1 through 14.7. Lecture 20. Physical Origins and Rate Equations Mass Transfer in Nonstationary Media Conservation Equation and Diffusion through Stationary Media Diffusion and Concentrations at InterfacesBy elliot
NON-STEADY STATE DIFFUSION. Non-steady state: The concentration profile changes with time. C = C (x,t). To conserve energy: dJ/dX =[J (right) – J (left) ] /dx = - C/ t Fick’s first law: J = -D( C/ x) d J/ d x = - / x [D( C/ x)] Substitute for dJ/dX:By webb
Relative Energy Levels of Defects. Information was extracted from: Porter and Easterling, Phase Transformations in Metals and Alloys , 2nd Edition, CRC Press , 2004. Surface energy at the solid liquid interface (AKA: interfacial free energy).By christian-workman
Practice Problems. Instructions. Divide yourselves into groups of three (3). Write your names and your complete solution into your answer sheet, and box/encircle your final answer. Any group who does not comply shall not be given points for that particular problem.By valentina-ovid
CHAPTER 5: DIFFUSION. • Material transport by atomic motion. Issues to consider:. • Types Predicting the rate of diffusion Factors that influence diffusion Importance of diffusion in materials processing. DIFFUSION EXAMPLE: Liquids. • Glass tube filled with water.By hendersonnancy
Transport phenomena. T1. The laws of diffusion. If gradients of concentration exist for a component, there will be a migration of the particles towards a region of lower concentration. This is called diffusion.By barbarabenjamin
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