Stefan diffusion _Junly 11th, 2011_

Stefan diffusion _Junly 11th, 2011_ - Stefan Diffusion Tube...

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Stefan Diffusion Tube Experiment Primary goal is to measure diffusion coefficient Live view, image capture, and image analysis using computer software This PPT file will be posted at SmartSite. No need to take notes ECH155A, 2011 Summer I, SK Jung
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Z A A Q1. What is diffusion? Clean, dry air (B) Reference Line As time Increases, “A” evaporates
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Z A A Q1. What is diffusion? Clean, dry air (B) Reference Line Random movements of molecules
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Chemical A Chemical B Chemical C
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Q2. What is the driving force for diffusion? A Concentration gradient A C l
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Z A A Q3. What is diffusion path length? Clean, dry air (B) Reference Line o l ) ( t l is a function of time l
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Q4. What sets the concentration gradient? A l Z Partial pressure at liquid surface ? = A C C A at z=0 C A at z= ? = A C l 0 = Z l Z = Concentration of A in gas
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Q5. What is C A at Z=0 ? A Q6. Why do you want laminar air flow? N Re 20 ? = A C 0 No turbulence No convective transport
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A Derivation 0 = A C at Z= at Z=0 Z 0 = - + A A R N 0 Quasi steady state
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This note was uploaded on 09/30/2011 for the course ECH 155A taught by Professor Kuhl during the Summer '11 term at UC Davis.

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Stefan diffusion _Junly 11th, 2011_ - Stefan Diffusion Tube...

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