Graduate Thesis Or Dissertation
 

The obstructive factor in gas chromatography

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/jd4731659

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  • The study of the obstructive factor by Hawkes (11) showed a relation between the obstructive factor and velocity using a continuous method. Later, Bowers and Hawkes (12) developed a similar method with some improvements in the apparatus and found out that the obstructive factor was not flow dependent. This study uses Bowers and Hawkes' apparatus with some changes and restudies the relationship between the obstructive factor and velocity with unretained gases on glass beads. The dependence of the obstructive factor on velocity was verified. The effects of diffusion coefficients and the particle-to-column diameter ratios on the obstructive factor-velocity relationship were investigated. The results are consistent with Hawkes' hypothesis (11) that values of y at low velocities are averages over tightly packed and loosely packed domains while at high velocities they are weighted in favor of the loosely packed domains where there is more flow. However, no explanation has been found for Bowers and Hawkes' results.
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