Combined free and forced convection in a constant temperature horizontal tube

An experimental study of superposed free and forced convection for air in a horizontal tube is reported. The laminar Nusselt number, based on the log mean temperature difference, ranged from 29.9 to 15.2; the laminar flow Graetz number, based on the bulk or average temperature of the air, ranged fro...

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Bibliographic Details
Published in:AIChE journal 1961-03, Vol.7 (1), p.38-41
Main Authors: Jackson, T. W., Spurlock, J. M., Purdy, K. R.
Format: Article
Language:English
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Summary:An experimental study of superposed free and forced convection for air in a horizontal tube is reported. The laminar Nusselt number, based on the log mean temperature difference, ranged from 29.9 to 15.2; the laminar flow Graetz number, based on the bulk or average temperature of the air, ranged from 33 to 1,300, the Grashof‐Prandtl modulus based on properties of air at the wall temperature ranged from 1.1 × 106 to 2.2 × 106. The Grashof number utilized the log mean temperature difference. An analysis of the system from a macroscopic viewpoint led to the determination of an equation which fits the laminar flow experimental data in the range of Graetz numbers from 60 to 1,300. An equation was also found for the turbulent data.
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.690070111