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大学物理（热学）

大学物理（热学）. Mean Free Path Diffusion, Thermal conductivity, and Viscosity. 2006-10-12. n i  the number of molecules of. in. v y v y + d v y. Equilibrium distribution. d n is the number of molecules. near v. Meaning of d n / N. among N molecules , how many are near v.

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大学物理（热学）

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  1. 大学物理（热学） • Mean Free Path • Diffusion, Thermal conductivity, and Viscosity 2006-10-12

  2. ni the number of moleculesof in vy vy + dvy Equilibrium distribution dn isthe number of molecules nearv

  3. Meaning of dn/N amongN molecules, how many are near v probability that one molecule is near v proportional to dvx ...

  4. Isotropic assumption The solution is The probability should be normalized

  5. a each normalized a 12

  6. Known while

  7. For unit volume Maxwell velocity distribution

  8. Maxwell speed distribution Most probable speed For one molecule, what speed is most possible? Among N molecules, what is the speed most molecules have in unit interval?

  9. Maxwellian can be written as

  10. The average speed

  11. Conduction Transport phenomena Heat transfer : conduction convection thermal radiation diffusion viscosity thermal conductivity Fourier’s law

  12. Diffusion Fick’s law Viscosity 6

  13. Microscopic theory of transport coefficients

  14. For mass transport,

  15. Similarly

  16. Hydrogen under STP r = 1.12×10−10m

  17. Experimental results:

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