| タイトル | The Dynamics of Miscible Fluids: A Space Flight Experiment (MIDAS) |
| 本文（外部サイト） | http://hdl.handle.net/2060/20020023153 |
| 著者（英） | Lauver, R.; Balasubramaniam, R.; Maxworthy, T.; Meiburg, E.; Rashidnia, N. |
| 著者所属（英） | NASA Glenn Research Center |
| 発行日 | 2001-01-01 |
| 言語 | eng |
| 内容記述 | We propose a space flight experiment to study the dynamics of miscible interfaces. A less viscous fluid displaces one of higher viscosity within a tube. The two fluids are miscible in all proportions. An intruding "finger" forms that occupies a fraction of the tube. As time progresses diffusion at the interface combined with flow induced straining between the two fluids modifies the concentration and velocity distributions within the whole tube. Also, under such circumstances it has been proposed that the interfacial stresses could depend on the local concentration gradients (Korteweg stresses) and that the divergence of the velocity need not be zero, even though the flow is incompressible. We have obtained reasonable agreement for the tip velocity between numerical simulations (that ignored the Korteweg stress and divergence effects) and physical experiments only at high Peclet Numbers. However at moderate to low Pe agreement was poor. As one possibility we attributed this lack of agreement to the disregard of these effects. We propose a space experiment to measure the finger shape, tip velocity, and the velocity and concentration fields. From intercomparisons between the experiment and the calculations we can then extract values for the coefficients of the Korteweg stress terms and confirm or deny the importance of these stresses. |
| NASA分類 | Space Processing |
| レポートNO | AIAA Paper 2001-5061 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/225461 |
