Influence of geometry on liquid oxygen magnetohydrodynamics
- Department of Mechanical and Aerospace Engineering, Utah State University, 4130 Old Main Hill, Logan, UT 84322-4130 (United States)
- Space Dynamics Laboratory, Utah State University Research Foundation, 1695 North Research Park Way, North Logan, UT 84341 (United States)
Magnetic fluid actuators have performed well in industrial applications, but have a limited temperature range due to the freezing point of the carrier fluid. Liquid oxygen (LOX) presents a pure, paramagnetic fluid suitable for use in a cryogenic magnetic fluid system; therefore, it is a potential solution to increasing the thermal range of magnetic fluid technology without the need for magnetic particles. The current study presents experimental work regarding the influence of geometry on the dynamics of a LOX slug in a 1.9 mm quartz tube when pulsed by a solenoid in a closed volume. A numerical analysis calculated the optimal solenoid geometry and balanced the magnetic, damping, and pressure forces to determine optimal slug lengths. Three configurations comprised the experiment: (1) a 24-gauge wire solenoid with an optimized 2.7 cm length slug, (2) a 30-gauge wire solenoid with an optimized 1.3 cm length slug, and (3) a 30-gauge wire solenoid with a nonoptimized 2.5 cm length slug. Typically, the hydrodynamic breakdown limit is calculated and used to determine the system range; however the experiment showed that the hydrodynamic breakdown limit was never reached by the slug. This implied that, instead, the system range should factor in a probabilistic risk of failure calculated as a function of the induced pressure change from its oscillations. The experimental data were also used to establish a nondimensional relationship between the maximum displacement and initial magnetic pressure on the slug. The average initial velocity of the slug was found to be proportional to the initial magnetic pressure, Mason number, and slug length. The results of this study can be used in the design and optimization of a LOX fluid system for space or low-temperature applications. (author)
- OSTI ID:
- 21350388
- Journal Information:
- Experimental Thermal and Fluid Science, Vol. 34, Issue 8; Other Information: Elsevier Ltd. All rights reserved; ISSN 0894-1777
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
SOLENOIDS
CRYOGENIC FLUIDS
MAGNETOHYDRODYNAMICS
OXYGEN
LENGTH
GEOMETRY
TEMPERATURE RANGE 0065-0273 K
EXPERIMENTAL DATA
QUARTZ
WIRES
NUMERICAL ANALYSIS
PROBABILISTIC ESTIMATION
PARAMAGNETISM
ACTUATORS
PRESSURE DEPENDENCE
CONFIGURATION
PULSES
DAMPING
DESIGN
FAILURES
HAZARDS
OPTIMIZATION
OSCILLATIONS
TUBES
VELOCITY
Magnetic fluids