(A) photographic study on the near-wall bubble behavior in subcooled flow boiling = 미포화 유동 비등에서 가시화를 통한 가열면 근처 기포 거동에 관한 연구

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The behavior of near-wall bubbles in subcooled flow boiling has been investigated photographically to identify the physical mechanisms of critical heat flux at subcooled and low-quality conditions. Visualization experiments were performed for water flow in vertical rectangular channels under atmospheric pressure for mass fluxes below 2020 kg/㎡s. The thickness and other features of the near-wall bubble layer were examined with the aid of a high-speed camera, a still camera and an 8 mm-camera recorder. The number of activated nucleation sites increased as the wall heat flux was increased. At sufficiently high heat flux about 5-7.5 MW/㎡, the appearance of vapor clot or blanket on the heated surface made a role of an obstacle between main liquid region and the region near heater. At such high heat flux, three characteristic regions were observed in the heated channel: (a) a superheated liquid layer with attached bubbles, (b) a flowing bubble layer consisting of large coalesced bubbles over the attached bubbles, and finally (c) the liquid core.
Advisors
Chang, Soon-Heungresearcher장순흥researcher
Description
한국과학기술원 : 원자력공학과,
Publisher
한국과학기술원
Issue Date
2000
Identifier
158113/325007 / 000983243
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 원자력공학과, 2000.2, [ vi, 54 p. ]

Keywords

Subcooled flow boiling; Critical heat flux; CHF; Bubble behvaior; 가시화; 기포 거동; 미포화 유동 비등; 임계열유속; Visualization

URI
http://hdl.handle.net/10203/49416
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=158113&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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