Behavior of thermal bubbles formed from a single nucleation site
- Behavior of thermal bubbles formed from a single nucleation site
- 장영수; Kwang-Hun Jeong; 이헌주; 이윤표; 김호영
- Thermal bubble; Microcavity; Boiling; MEMS
- Issue Date
- Journal of Mechanical Science and Technology
- VOL 24, NO 1, 415-420
- Thermal bubble formation is a fundamental process in nucleate boiling heat transfer and in many microelectromechanical thermal systems.
Here, we report an experimental study of the dynamic and thermal behavior of bubbles generated at a single site, that is, a microcavity
filled with alumina particles. The thermal process associated with the bubble departure from the isolated cavity, in particular, was
shown to be different from that of macroscale boiling. The bubble departure diameter remains constant in a low superheat (or Jakob
number) regime which is solely determined by the balance of interfacial tension and buoyancy. In addition, the bubble departure frequency
increases along the bubble size as the substrate temperature rises. The further-increased frequency of bubbles emerging from the
cavity causes multiple bubbles to coalesce before the preceding bubble completely detaches from the substrate, thus, leading to the decrease
of apparent departure frequency with the increase of substrate temperature.
- Appears in Collections:
- KIST Publication > Article
- Files in This Item:
There are no files associated with this item.
- RIS (EndNote)
- XLS (Excel)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.