Temperature depressions for evaporating spheres at low pressures

Madden, A. J.; Halfen, Frank J.

doi:10.1002/aic.690070134

AIChE Journal

1961

DOI: 10.1002/aic.690070134

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Temperature depressions for evaporating spheres at low pressures

A. J. Madden

Frank J. Halfen

Abstract: The evaporation of naphthalene spheres into air in the micron pressure range may be accompanied by an appreciable surface temperature depression. The magnitude of the effect is shown to depend upon the geometry of the experimentol system and the pressure level. Such effects are of interest in studies aimed a t determining evaporation coefficients.

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Cited by 4 publications

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Psychrometric Studies

Henry

Epstein

1970

Can J Chem Eng

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The overall or macroscopic psychrometric ratios have been measured for naphthalene, p‐dichlorobenzene and d‐camphor cylinders and spheres sublimating into both air and helium gas streams in low intensity turbulent flow. The macroscopic psychrometric ratio was found to be independent of gas temperature level, gas velocity and particle diameter, in line with theoretical expectations. The results for cylinders in cross‐flow and spheres were identical and could best be represented, along with data from the literature to a total of eighteen gas‐vapor systems, by an equation similar to that of Bedingfield and Drew. The upper limit of Lewis number was extended by the present correlation from 3.7 to 7.2.Two simple theoretical equations are presented for predicting the “limiting” psychrometric ratio of a sphere, cylinder or flat plate under conditions of pure molecular diffusion of heat and mass. These equations bracket the actual wet‐bulb data obtained for both naphthalene and p‐dichlorobenzene cylinders and spheres sublimating into a quiescent air atmosphere.On a mesuré les rapports psychrométriques globaux ou macroscopiques dans le cas de cylindres et sphères de naphthaline, paradichlorobenzène et camphre‐d qui sublimaient dans des courants d'air et d'hélium gazeux dans des conditions de débit lent et de faible intensité. On a constaté, conformément aux prédictions théoriques, que le rapport psychrométrique macroscopique était indépendant du degré de température du gaz ainsi que de sa vélocité et du diamètre de ses particules. On a trouvé que les résultats relatifs aux cylindres dans un écoulement transversal et aux sphères étaient identiques et pouvaient être le mieux représentés (avec des données obtenues dans la littérature et s'étendant à un total de 18 systèmes de gaz et vapeur) par une équation semblable à celle de Bedingfield et Drew. La corrélation présente a permis l'extension de la limite supérieure du nombre de Lewis de 3.7 à 7.2. On présente deux équations théoriques simples pour prédire le rapport psychrométrique limite d'une sphère, d'un cylindre ou d'une plaque plate dans des conditions de diffusion moléculaire pure de chaleur et de masse. Ces équations appuient les résultats pour bulbes humides qu'on a en fait obtenus dans le cas de cylindres et sphères de naphthaline et paradichlorobenzène qui sublimaient dans une atmosphère tranquille d'air.

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Psychrometric Studies

Henry

Epstein

1970

Can J Chem Eng

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Heat transfer, a review of current literature

Eckert

Irvine

Sparrow

et al. 1962

International Journal of Heat and Mass Transfer

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Heat transfer—A review of current literature

Eckert

Irvine

Sparrow

et al. 1965

International Journal of Heat and Mass Transfer

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Temperature depressions for evaporating spheres at low pressures

Cited by 4 publications

References 5 publications

Psychrometric Studies

Psychrometric Studies

Heat transfer, a review of current literature

Heat transfer—A review of current literature

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