Download Elements of Flow and Diffusion Processes in Separation by Dr. Wolfgang Ehrfeld (auth.) PDF

By Dr. Wolfgang Ehrfeld (auth.)

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Extra info for Elements of Flow and Diffusion Processes in Separation Nozzles

Example text

For the l i g h t a u x i l i a r y gas, q u a l i t a t i v e l y s i m i l a r ion current curves r e s u l t . 1Oa), the ion current has a maximum with the opening of the probe facing upstream (~=0 ~ and a minimum with the opening of the probe facing downstream (~= •176 the ion current curve is symmetrical r e l a - t i v e to the maximum. The curve plotted in the diagram was f i t t e d to the measured values of the ion current under the assumption of the local v e l o c i t y d i s t r i b u t i o n corresponding to a Maxwellian d i s t r i b u t i o n .

1, allows the local values of the fluxes of the components of the mixture to be determined and the p a r t i a l cuts to be obtained from these values by integration. Moreover, one obtains the local values of the speed ratios of the components of the mixture, from which the equilibrium separation e f f e c t can be calculated. 12 shows the results of measurements performed by molecular probes in the standard separation nozzle using SF6 instead of the corrosive UF6 with He as a ~-~E ~- . . . .

12. 5. 1) 33 l i g h t a u x i l i a r y gas. I t is seen that the elementary e f f e c t ~A of isotope separation passes through a maximum over the angle of deflection, while the gas separation factor Am between He and SF6 rises continuously. The values measured for cA not only are c l e a r l y above the values of equilibrium separation following from the SF6 speed ratios but, in the flow region upstream the skimmer, also exceed the upper l i m i t of equilibrium separation.

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