Capillary movement of liquid in granular beds
Knowledge of capillary migration of liquids in granular beds in microgravity is essential for the development of a substrate based nutrient delivery sytem for the growth of plants in space. This problem is also interesting from the theoretical as well as the practical point of view. The purpose of this study was to model capillary water propagation through a granular bed in microgravity. In our ground experiments, water propagation is driven primarily by capillary force. Data for spherical partical sizes in the range from 0.46 to 2 mm have been obtained. It was shown that the velocity of water propagation is very sensitive to particle size. Theoretical consideration is also provided. Actual space flight experiments are planned for the future to confirm our results.
- Research Organization:
- National Aeronautics and Space Administration, Moffett Field, CA (United States). Ames Research Center
- OSTI ID:
- 101920
- Report Number(s):
- CONF-930771-; TRN: 9590399
- Resource Relation:
- Conference: 23. international conference on environmental systems, Colorado Springs, CO (United States), 12-15 Jul 1993; Other Information: PBD: 1993
- Country of Publication:
- United States
- Language:
- English
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