Dielectrophoretic Flowing Wedge for Low-Gravity Phase Separation
Author(s)
Vitale, Shay
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Abstract
Dielectrophoretic (DEP) phase separation for contactless gas-liquid separation in microgravity is evaluated through modeling, design, and experimental validation of a DEP-enhanced capillary wedge. One-dimensional analytic models and Surface Evolver simulations are used to explore the trade-space defined by wedge angles, bubble radii, and applied voltages (0-5 kV AC at 22 kHz) across zero, lunar, and Martian gravity environments to predict bubble trajectory, threshold voltages, and separator length. The results demonstrate reliable bubble ejection below 2.5 kV for liquid oxygen at flow rates of 8 ml/s and indicate up to 30% reduction in separator length under partial gravity. Informed by these findings, a 2U form-factor payload with optically transparent ITO electrodes was designed and manufactured, incorporating a flight-safe high-voltage power supply, fluid loop, and Raspberry Pi-based control system. The payload circulates silicone oil up to 5 ml/s and operates at 22 kHz, 5 kVAC to validate the efficacy of the DEP force at augmenting capillarity in phase separation. Experimental validation during parabolic flights toggles DEP on alternating parabolas and records high-speed video of bubble trajectories, confirming simulation predictions. This integrated modeling and validation framework advances DEP-driven multiphase-flow management for spacecraft life support, fluid management systems, and in-situ resource utilization (ISRU).
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Date
2025-08
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Text
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Masters Project
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Research Report
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