Transient diffusion

Figure 14.10 Shape of a mass variation-time curve in the case of osmotic cracking (a) end of the diffusion transient, (b) onset of cracking, and (c) percolation threshold of the crack network. [Pg.456]

The characteristic diffusion time for any UME geometry where the transition from semi-infinite linear diffusion (transient) to hemispherical or spherical diffusion (steady state) occurs may be given as... [Pg.687]

The absorption spectrum of the C radical was identified at short times following the flash and is attributed to secondary reactions of the primary product, singlet C2O. In addition, diffuse transient spectra were observed whose assignment Is uncertain but may include singlet C2O or its reaction products. [Pg.8]

Since (D,. (g/O, ) = otP , measurements at various pressure levels permits determination of both D, ab nd D Ky,. This experimental approach is usually termed the Wicke-Kallenbach method (Wicke and Kallenbach [52] or Weisz [53] also see Satterfield [40]) and has been widely used to measure effective diffusivities. Transient methods are also available (e.g., Etogu and Smith [54]). [Pg.170]

More about Diffusion Transient Diffusion and Diffusion with Reaction... [Pg.121]

More about Diffusion Transient Diffiision and Dijfusion with Reaction 185... [Pg.185]

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