Natural convection in the cranked thermosyphon

The paper presents the results of an experimental investigation of the heat transfer characteristics of the cranked, tubular thermosyphon under single phase conditions. Using water in a small scale rig, data have been obtained for 10 5.9 < Ra < 10 7.5, and have been plotted in the usual form o...

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Bibliographic Details
Published inInternational journal of heat and mass transfer Vol. 36; no. 1; pp. 177 - 182
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)
Nusselt number
Thermosiphon
Bended pipe
Tubular shape
Single phase flow
Experimental study
Rayleigh number
Heat transfer
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Summary:The paper presents the results of an experimental investigation of the heat transfer characteristics of the cranked, tubular thermosyphon under single phase conditions. Using water in a small scale rig, data have been obtained for 10 5.9 < Ra < 10 7.5, and have been plotted in the usual form of Nu vs Ra. The effect of Rayleigh number on Nusselt number suggests three flow regimes: for Ra ≲ 10 6.5. a laminar, impeded regime is generally indicated; for Ra > 10 7.15, the data suggest a turbulent boundary layer regime; between these regimes is a third which has the characteristics of a short-lived fully-mixed turbulent regime.
ISSN:0017-9310
1879-2189
DOI:10.1016/0017-9310(93)80077-8