| 21. | However, it is affected also by tissue destruction, which may lead to exaggeration of diffusivity measures.
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| 22. | Strictly speaking, however, the effective diffusivity is proportional to the reciprocal of the square of the geometrical tortuosity
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| 23. | The diffusivity is generally prescribed for a given pair of species and pairwise for a multi-species system.
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| 24. | The thermal diffusivity of air is about K = 1.9 * 10-5 m2 / s.
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| 25. | The diffusivity for Knudsen diffusion is obtained from the self-diffusion coefficient derived from the kinetic theory of gases:
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| 26. | A major drawback of the method is for problems with large diffusivity the time step restriction can be too severe.
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| 27. | This finding led Darken to analyze Johnson's experiment and derive the equation for chemical diffusivity of binary solutions.
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| 28. | For the momentum balance, kinematic viscosity \ nu can be considered to be the " momentum diffusivity ".
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| 29. | The higher the diffusivity ( of one substance with respect to another ), the faster they diffuse into each other.
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| 30. | The diffusivities in the two minor axes are often averaged to produce a measure of "'radial diffusivity "'
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