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WHY STUDY DIFFUSION

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kermit
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WHY STUDY DIFFUSION

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    1. Topic 5: DIFFUSION IN SOLIDS

    2. Topic 5: DIFFUSION IN SOLIDS

    3. DIFFUSION Phenomenon of material transport by atomic or particle transport from region of high to low concentration What forces the particles to go from left to right? Does each particle “know” its local concentration? Every particle is equally likely to go left or right! At the interfaces in the above picture, there are more particles going right than left ? this causes an average “flux” of particles to the right! Largely determined by probability & statistics

    4. DIFFUSION DEMO

    5. DIFFUSION: THE PHENOMENA (1)

    6. DIFFUSION: THE PHENOMENA (2)

    7. DIFFUSION MECHANISMS

    8. DIFFUSION MECHANISMS

    9. ACTIVATION ENERGY FOR DIFFUSION Also called energy barrier for diffusion

    10. DIFFUSION SIMULATION

    11. INTERSTITIAL SIMULATION

    12. PROCESSING USING DIFFUSION (1)

    13. PROCESSING USING DIFFUSION (2)

    14. MODELING DIFFUSION: FLUX

    15. CONCENTRATION PROFILES & FLUX

    16. STEADY STATE DIFFUSION

    17. EX: STEADY STATE DIFFUSION

    18. STEADY STATE DIFFUSION: ANOTHER PERSPECTIVE Hose connected to tap; tap turned on At the instant tap is turned on, pressure is high at the tap end, and 1 atmosphere at the other end After steady state is reached, pressure linearly drops from tap to other end, and will not change anymore

    19. NON STEADY STATE DIFFUSION

    20. EX: NON STEADY STATE DIFFUSION

    21. EX: NON STEADY STATE DIFFUSION

    22. PROCESS DESIGN EXAMPLE

    23. DIFFUSION DEMO: ANALYSIS Typically, we let the experiment described on slide 2 run during the class; at this point in the class, the results are available for the class to look at.Typically, we let the experiment described on slide 2 run during the class; at this point in the class, the results are available for the class to look at.

    24. DATA FROM DIFFUSION DEMO

    25. PROCESSING QUESTION

    26. DIFFUSION AND TEMPERATURE

    27. ACTIVATION ENERGY FOR DIFFUSION Also called energy barrier for diffusion

    28. DIFFUSION AND TEMPERATURE

    29. SUMMARY: STRUCTURE & DIFFUSION

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