ISSN:
1432-0681
Keywords:
Key words flow contraction
;
preparative liquid chromatography (HPLC)
;
funnel
;
convective mixing
;
holdback
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Summary In some technical applications mixing caused by contraction of cross section is to be avoided. An example is the outlet of a chromatographic column in preparative liquid chromatography (HPLC). First of all, it is desirable to reduce the volume of the cylinder within which the mixing occurs. This is done by placing a porous disk upstream of the contraction. Mixing within the contraction (or funnel) is avoided if a constant axial velocity component over every cross-section is achieved. Two such velocity fields have been found analytically. The funnel shapes have been taken to be the stream tubes of these fields. The mixing within these funnels, and indeed in other common funnels, is described by the breakthrough curves or residence-time distributions, which are numerically determined. An experiment has been set up to measure the breakthrough curves for different funnels.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s004190050174
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