Sliding bubble dynamics and the effects on surface heat transfer
Citation:
Donnelly, A.J. Robinson, Y.M.C. Delaure, D.B. Murray, Sliding bubble dynamics and the effects on surface heat transfer, Journal of Physics: Conference Series, EUROTHERM 2012, Potiers, France, Sept. 4-7, 2012, 012180-Download Item:
sliding.pdf (Accepted for publication (author's copy) - Peer Reviewed) 3.359Mb
Abstract:
An investigation into the eff ects of a single sliding air bubble on heat transfer from a
submerged, inclined surface has been undertaken. Existing literature has shown that both
vapour and gas bubbles can increase heat transfer rates from adjacent heated surfaces. However,
the mechanisms involved are complex and dynamic and in some cases poorly understood. The
present study utilises high speed, high resolution, infrared thermography and video photography
to measure two dimensional surface heat transfer and three dimensional bubble position and
shape. This provides a unique insight into the complex interactions at the heated surface.
Bubbles of volume 0.05, 0.1, 0.2 and 0.4 ml were released onto a surface inclined at 30 degrees
to horizontal. Results con rmed that sliding bubbles can enhance heat transfer rates up to a
factor of 9 and further insight was gained about the mechanisms behind this phenomenon. The
enhancement e ects were observed over large areas and persisted for a long duration with the
bubble exhibiting complex shape and path oscillations. It is believed that the periodic wake
structure present behind the sliding bubble a ects the bubble motion and is responsible for the
heat transfer e ects observed. The nature of this wake is proposed to be that of a chain of
horseshoe vortices.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
ENM2151
Author's Homepage:
http://people.tcd.ie/arobinshttp://people.tcd.ie/dmurray
Description:
PUBLISHEDPotiers, France
Author: ROBINSON, ANTHONY; MURRAY, DARINA
Other Titles:
Journal of Physics: Conference SeriesEUROTHERM 2012
Type of material:
Conference PaperAvailability:
Full text availableKeywords:
single sliding air bubbleDOI:
http://dx.doi.org/10.1088/1742-6596/395/1/012180Licences: