An experimental study on the effect of liquid film thickness on bubble dynamics
2013 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 51, no 1-2, 459-467 p.Article in journal (Refereed) Published
Experiments were conducted to investigate the boiling phenomenon in various liquid layers on a silicon heater surface with an artificial cavity. Deionized water is employed as working liquid. The emphasis is placed on how the liquid layer thickness affects bubble behaviour and liquid layer integrity for nucleate boiling under the isolated bubble regime. The experimental results show that for boiling in a liquid layer of ∼7.5 mm, the bubble dynamics reproduce the typical pool boiling characteristics with the averaged maximum diameter of 3.2 mm for the isolated bubbles growing on the cavity. As the water layer thickness decreases to the level comparable with the bubble departure diameter, the bubble is found to remain on the heater surface for an extended period, with a dry spot forming under the bubble but rewetted after the bubble rupture occurs. Further reducing the liquid layer thickness, an irreversible dry spot appears, suggesting a minimum rewettable thickness ranging from 1.2 mm to 1.9 mm corresponding to heat flux of 26 kW/m2 to 52 kW/m2. The void measured in the cavity confirms that it is dry inside the artificial cavity at high heat flux.
Place, publisher, year, edition, pages
2013. Vol. 51, no 1-2, 459-467 p.
Boiling, Bubble dynamics, Liquid layer thickness
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-117820DOI: 10.1016/j.applthermaleng.2012.09.025ISI: 000316036300049ScopusID: 2-s2.0-84867746908OAI: oai:DiVA.org:kth-117820DiVA: diva2:603160
FunderSwedish Research Council, VR-2005-5729
QC 201302052013-02-052013-02-052013-04-11Bibliographically approved