KAGAKU KOGAKU RONBUNSHU
Online ISSN : 1349-9203
Print ISSN : 0386-216X
ISSN-L : 0386-216X
Circumferential Distributions od Mass Transfer Coefficient and Wall Shear Stress on Inner Tube in Eccentric Annulus Flow
Hisashi MiyashitaAkio NakamuraSeiichi HiranoKaichiro Wakabayashi
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1984 Volume 10 Issue 1 Pages 38-42

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Abstract

An experimental study of the mechanism of mass transfer on the inner tube wall in an eccentric annulus was carried out by use of an electrochemical method.
The circumferential distribution of local mass transfer coefficient on the inner tube was measured by varying the Reynolds number, the radius ratio value (D0/Di) and the eccentricity values. To examine the transfer mechanism, wall shear stress on the inner tube wall and its fluctuation intensity were measured.
From the behavior of the distributions of the factors mentioned above, it was found that the tendency of distribution of local mass transfer coefficients depended on the shear stresses. In addition, it was found that the turbulence level of the shear stress fluctuation was highest at ±60 degrees from the narrowest cross section in the eccentric annulus. Also, as the flow rate began to fall against the narrowest section from the turbulence section, then the mass transfer coefficients became small.

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© by THE SOCIETY OF CHEMICAL ENGINEERS, JAPAN
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