Chromatography Handbook Of Hplc - Katz Eksteen Schocnmakers Miller wiley Sons -109

Mechanisms and Importance of Zone-Spreading 99\n\nFigure 6 Dimensionless velocity versus dimensionless time domains in which different plate height equations are valid for k = 0. The preferred region is the upper right Taylor-Aris-Golay region.\n\nPelet number or reduced velocity\n\ndifferent when relatively thick layers of stationary phase are used, in specific cases in GC and OTLC.\nIf the C term is negligible, the optimum conditions for capillary GC columns can be estimated from Eqs. (35a) (without the A term), and (35b) to yield:\nHmin,cap = 2[Bcap/C,cap]^{1/2} = R.l[f(k)/3]^{1/2}\nand\nhmin,cap = (1/2)[l(f(k)/3]^{1/2}\nwhile:\nuopt,cap = [Bcap/C,cap]^{1/2} = (Dm/R)^{1/2}[48/f(k)]^{1/2}\nand\nvopt,cap = 2[48/f(k)]^{1/2}\nHence, there is a clear dependence on the capacity factor k: