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Axial dispersion in a tubular flow vessel with bends
Author(s) -
Park Chan Mo,
Gomezplata Albert
Publication year - 1971
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450490206
Subject(s) - reynolds number , dispersion (optics) , mechanics , section (typography) , flow (mathematics) , cross section (physics) , materials science , geometry , mathematics , physics , optics , turbulence , quantum mechanics , advertising , business
A two measurement points pulse techniqque was employed to determine axial dispersion coefficients in a 3/4 inch diameter pipe with four 90 degree bends located at 50 inch intervals. Water velocities corresponding to Reynold numbers of 3,800 to 11,500 were used. It was found that the effect of bends on the overall dispersion coefficient depends on the Reynolds number and a characteristic length. Two mathematical models of a reactor with bends are presented. One model assumed that the bend section is a perfectly mixed reactor with an equivalent length. The second assumed a fixed equivalent length for the bend section and a proportional relationship between the dispersion coefficients in the bend and the straight section.