Natural Convection heat transfer and fluid dynamics for a pair of vertically aligned isothermal horizontal cylinders.
File Type:Microsoft Word
Item Type:Journal Article
Citation:Persoons, T., O'Gorman, I.M., Donoghue, D.B., Byrne, G. and Murray, D.B., Natural Convection heat transfer and fluid dynamics for a pair of vertically aligned isothermal horizontal cylinders., International Journal of Heat and Mass Transfer, 54, 2011, 5163 - 5172
Persoons et al Natural Convection.doc (Published (author's copy) - Peer Reviewed) 1.646Mb
This paper discusses the close interaction between local fluid dynamics and natural convection heat transfer from a pair of isothermally heated horizontal cylinders submerged in water. The presence of a second heated cylinder induces heat transfer enhancements of up to 10%, and strong fluctuations in local heat transfer rate. Therefore specific attention is focused on how the local heat transfer characteristics of the upper cylinder are affected by buoyancy induced fluid flow from the lower cylinder. The paper investigates a range of Rayleigh number between 1.8 ? 106 and 5.5 ? 106, and a vertical cylinder spacing between 2D and 4D. Simultaneous local heat flux measurements and flow velocity measurements using particle image velocimetry reveal oscillatory behaviour of the thermal plume, depending on operating conditions. A joint temporal analysis of the data has provided new insights into the governing mechanisms, which enables further optimisation of the heat transfer performance.
Science Foundation Ireland (SFI)
Type of material:Journal Article
Series/Report no:International Journal of Heat and Mass Transfer
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