O'Gorman, I.M., Murray, D.B., Byrne, G. and Persoons, T., Natural convection from isothermal horizontal cylinders, ASME International Mechanical Engineering Congress and Exposition, Florida, USA, November, ASME, 2009, 8
The research described here is concerned with natural
convection from isothermal cylinders, with a particular focus
on the interaction between a pair of vertically aligned cylinders.
Prime attention was focused on how the local heat transfer
characteristics of the upper cylinder are affected due to
buoyancy induced fluid flow from the lower cylinder. Tests
were performed using internally heated copper cylinders with
an outside diameter 30mm and a vertical separation distance
between the cylinders ranging from two to three cylinder
diameters. Plume interaction between the heated cylinders was
investigated within a Rayleigh number range of 2x106 to 6x106.
Spectral analysis of the associated heat transfer interaction is
presented showing that interaction between the cylinders
causes oscillation of the thermal plume. The effect of this
oscillation is considered as a possible enhancement mechanism
of the heat transfer performance of the upper cylinder.
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