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Forced convective mass transfer from circular disks

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Abstract

Overall forced convective mass transfer rates were measured from naphthalene circular disks of two inches diameter suspended in an air stream. The data consisting of fifty two experiments were correlated with following expression with a standard deviation of 2.0%, Sh=0.266 (Re)0.60 (Sc)1/3 for the range of 270< Re< 34900.-Data obtained for mass transfer from frontal areas of disks were correlated with a standard deviation of 2.63% by following relationship. Sh=0.67 (Re)0.54 (Re)1/3 for the range of 250< Re< 34800.

Zusammenfassung

Die Gesamtbeträge der Stoffübertragung bei Zwangskonvektion wurden an einer Naphthalinscheibe von 50 mm Durchmesser gemessen, die in einem Luftstrom aufgehängt war. Die in 52 Versuchen gewonnenen Meßdaten wurden durch den folgenden Ausdruck mit einer Standardabweichung von 2% korreliert. Sh=0,266 (Re)0,60(Sc)1/3, gültig für 270< Re< 34 900. — Die Versuchsergebnisse für den Stoffübergang von den Stirnseiten der Scheibe konnten durch folgenden Ausdruck Sh=0,67(Re)0,54(Re)1/3, gültig für 250 < Re < 34 800 mit einer Standardabweichung von 2,63%, korreliert werden.

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Abbreviations

A:

Constant in Eq. (3)

B:

Constant in Eq. (3)

kc :

Continuous phase mass transfer coefficient (cm/hr)

N:

Overall mass transfer rates (gm · mole/hr)

P* :

Equilibrium vapour pressure of naphthalene (mm · Hg)

p0 :

Vapour pressure of naphthalene in air stream of wind tunnel (mm · Hg)

q:

Number of observations

R:

Gas constant, 62.368 x 103 (cm3) (mm · Hg)/(°k) (gm · moles)

Re =ud/ν:

Reynolds number

S:

Surface area (cm2)

S2 (Y):

Estimate of variance, bases on the deviations of data points from their predicted values

Sc =ν/Dv :

Schmidt number

Sh=kcd/Dv :

Sherwood number

T:

Absolute temperature (°K)

U:

Velocity of air in the wind tunnel. (cm/sec.)

σ2 :

True variance calculated with infinite degree of freedom

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Author notes

  1. S. A. Beg (Associate Professor)

    Present address: School of Engineering, Pahlavi University, Shiraz, Iran

Authors and Affiliations

  1. Department of Chemical Engineering and Chemical Technology, Imperial College of Science and Technology, London

    S. A. Beg (Associate Professor)

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Beg, S.A. Forced convective mass transfer from circular disks. Wärme- und Stoffübertragung 6, 45–51 (1973). https://doi.org/10.1007/BF01270704

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  • DOI: https://doi.org/10.1007/BF01270704

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