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Thermocapillary Convection Space Experiment on the SJ-10 Recoverable Satellite
Published on: March 11, 2020
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Capillary channel flow experiments aboard the International Space Station.
M Conrath1, P J Canfield1, P M Bronowicki1
1Center of Applied Space Technology and Microgravity (ZARM), University of Bremen, Am Fallturm 01, 28359 Bremen, Germany.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 4, 2014
Summary
Spacecraft fluid systems face challenges in microgravity due to capillary forces. Experiments investigate partially open channels to prevent bubble ingestion and ensure reliable fluid transport.
Area of Science:
- Fluid dynamics in microgravity
- Interfacial phenomena in space
Background:
- Capillary forces dominate fluid behavior in near-weightless environments, unlike on Earth.
- Buoyancy's absence in space necessitates new methods for phase separation in fluid systems.
- Bubble ingestion in fluid channels can critically disrupt spacecraft life support and propulsion systems.
Purpose of the Study:
- Investigate critical flow rates in partially open channels to prevent free surface collapse and bubble ingestion.
- Determine how conduit geometry and asymmetries affect capillary-driven phase separation.
- Explore applications for capillary-driven fluid management in spacecraft and terrestrial systems.
Main Methods:
- Experiments conducted aboard the International Space Station (ISS).
- Analysis of fluid flow in partially open channels with varying geometries.
- Focus on transient phenomena and conduit asymmetries.
Main Results:
- Identified critical flow rate-limiting conditions leading to bubble ingestion.
- Demonstrated the potential of capillary forces to replace gravity for passive phase separation.
- Characterized the influence of channel geometry on interfacial flow stability.
Conclusions:
- Partially open channels can be engineered to manage fluid interfaces and prevent bubble ingestion in microgravity.
- Capillary forces offer a viable alternative to buoyancy for phase separation in space-based fluid systems.
- Findings support the development of reliable fluid acquisition, circulation, and water processing systems for long-duration space missions.
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