| タイトル | Production of Gas Bubbles in Reduced Gravity Environments |
| 本文（外部サイト） | http://hdl.handle.net/2060/19970000379 |
| 著者（英） | Takagi, Shu; Misawa, Masaki; Oguz, Hasan N. |
| 著者所属（英） | Johns Hopkins Univ. |
| 発行日 | 1996-09-01 |
| 言語 | eng |
| 内容記述 | In a wide variety of applications such as waste water treatment, biological reactors, gas-liquid reactors, blood oxygenation, purification of liquids, etc., it is necessary to produce small bubbles in liquids. Since gravity plays an essential role in currently available techniques, the adaptation of these applications to space requires the development of new tools. Under normal gravity, bubbles are typically generated by forcing gas through an orifice in a liquid. When a growing bubble becomes large enough, the buoyancy dominates the surface tension force causing it to detach from the orifice. In space, the process is quite different and the bubble may remain attached to the orifice indefinitely. The most practical approach to simulating gravity seems to be imposing an ambient flow to force bubbles out of the orifice. In this paper, we are interested in the effect of an imposed flow in 0 and 1 g. Specifically, we investigate the process of bubble formation subject to a parallel and a cross flow. In the case of parallel flow, we have a hypodermic needle in a tube from which bubbles can be produced. On the other hand, the cross flow condition is established by forcing bubbles through an orifice on a wall in a shear flow. The first series of experiments have been performed under normal gravity conditions and the working fluid was water. A high quality microgravity facility has been used for the second type and silicone oil is used as the host liquid. |
| NASA分類 | Materials Processing |
| レポートNO | 97N10346 |
| 権利 | No Copyright |
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