The influence of tilt on natural convection in the elbow thermosyphon

The paper presents the results of an experimental study of natural convection in a water-filled, elbow thermosyphon. Data have been obtained with a small-scale rig in which the Rayleigh number was varied in the range 10 5.6 < Ra < 10 7.6 with 1.98 cm inner diameter tubes having heated and cool...

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Bibliographic Details
Published inInternational journal of heat and mass transfer Vol. 36; no. 1; pp. 183 - 188
Main Authors Lock, G.S.H., Ladoon, D.
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 1993
Elsevier
Subjects
Applied sciences
Devices using thermal energy
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Heat exchangers (included heat transformers, condensers, cooling towers)
Tilt angle
Thermosiphon
Geometrical parameter
Bended pipe
Tubular shape
Natural convection
Experimental study
Rayleigh number
Heat transfer
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Summary:The paper presents the results of an experimental study of natural convection in a water-filled, elbow thermosyphon. Data have been obtained with a small-scale rig in which the Rayleigh number was varied in the range 10 5.6 < Ra < 10 7.6 with 1.98 cm inner diameter tubes having heated and cooled lengths ranging from 20 to 80 cm. The main purpose of the study was to determine the effect of tilting an initially-vertical cooled section. The results show that forward, or positive, tilts produce very little effect on the heat transfer rate while backward, or negative, tilts produce a dramatic reduction within the first 20 degrees.
ISSN:0017-9310
1879-2189
DOI:10.1016/0017-9310(93)80078-9