This paper reports preliminary results for pool film boiling on a wire immersed in almost saturated FC72 recently obtained during an experimental campaign performed in low gravity on the European Space Agency Zero-G airplane, (reduced gravity level 10 -2). This is part of a long-term research program on the effect of gravitational and electric forces on boiling. The reported data set refers to experiments performed under the following conditions: (1) Earth gravity without electric field, (2) Earth gravity with electric field, (3) low gravity without electric field, and (4) low gravity with electric field. Although a decrease of gravity causes a heat transfer degradation, the electric field markedly improves heat exchange. This improvement is so effective that, beyond a certain field value, the heat flux is no longer sensitive to gravity. Two main film boiling regimes have been identified, both in normal and in low gravity: one is affected by the electric field and the other is practically insensitive to the field influence.
|Autori interni:||GRASSI, WALTER|
DI MARCO, PAOLO
|Autori:||DI MARCO P; GRASSI W.; TRENTAVIZI F.|
|Titolo:||Pool Film Boiling Experiments on a Wire in Low Gravity: Preliminary Results|
|Anno del prodotto:||2002|
|Appare nelle tipologie:||1.1 Articolo in rivista|