ISSN Online: 2377-424X
ISBN Print: 0-85295-345-3
International Heat Transfer Conference 10
OCCURRENCE AND STABILITY OF MICROBUBBLE EMISSION BOILING - STORMY AND CALM REGIMES -
Abstrakt
Microbubble emission boiling (MEB) is the regime that
occurs in the subcooled transition boiling region. This
experimental investigation reveals that this phenomenon
includes two regimes, i.e., the stormy and calm microbubble
emission boilings. This study also shows temperature
fluctuations of a heat transfer surface and pressure fluctuations in the liquid near the surface to classify MEB into the above regimes. The temperature fluctuations in either regime arc smaller than those at the critical heat flux. The pressure nucleations arc larger in the stormy MEB, and smaller in the calm MEB as compared with those at the critical heat flux. The liquid subcooling and flow velocity approaching the surface are important aspects by which to generate those regimes. A number of experiments lead to the map of MEB regimes that consists of liquid subcooling and flow velocity. An oscillatory character between the two regimes appears under several conditions.