5.6 Diffusion Coefficients and Molecular Diameters of Non-electrolytes Diffusivity in Solution Molecular Diameter Molecular Weight g/(g-mol) 10-5 *(cm2 /s) 10-8 * cm 10 2.20 2.9 100 0.70 6.2 1,000 0.25 13.2 10,000 0.11 28.5 100,000 0.05 62.0 1,000,000 0.025 132.0 Source: W.S. Winston Ho and Norman N. Li , Processes,” Perry’s Chemical Engineers’ “Membrane Handbook, ed. Robert H. Perry and Don W. Green, 6th ed. (New York: McGraw-Hill, 1984)17-20. A qualitative picture of the longitudinal electric field at the axis of the electron avalanche is given in Figure 16.7. The x=0 plane corresponds to the front of the avalanche and is where the field attains the maximum average value it can have in the plane, the electric field decreases. Notice that for x>0, the fields decrease is slower than for x<0. . E=MC2 (1.1) The electron energy distribution is far from equilibrium. It is enriched with high – Away energy electrons, a consequence of the large electric field. Furthermore, the distribution is from anisotropic in the high energy. this
5.6 Diffusion Coefficients and Molecular Diameters of Non-electrolytes Molecular Weight g/(g-mol) Diffusivity in Solution 10-5 *(cm2 /s) Molecular Diameter 10-8 * cm 10 2.20 2.9 100 0.70 6.2 1,000 0.25 13.2 10,000 0.11 28.5 100,000 0.05 62.0 1,000,000 0.025 132.0 Source: W.S. Winston Ho and Norman N. Li , “Membrane Processes,” Perry’s Chemical Engineers’ Handbook, ed. Robert H. Perry and Don W. Green, 6th ed. (New York: McGraw-Hill, 1984)17-20. A qualitative picture of the longitudinal electric field at the axis of the electron avalanche is given in Figure 16.7. The x=0 plane corresponds to the front of the avalanche and is where the field attains the maximum average value it can have in the . Away from this plane, the electric field decreases. Notice that for x>0, the fields decrease is slower than for x<0. E=MC2 (1.1) The electron energy distribution is far from equilibrium. It is enriched with high – energy electrons, a consequence of the large electric field. Furthermore, the distribution is anisotropic in the high energy.
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