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🛰️ Propellant Settling & Transfer

On-orbit refueling: use ullage thrust to settle floating propellant against the tank outlet before pumping. Tune thrust level, surface tension and fill fraction and watch the Bond number decide whether the transfer runs clean or ingests vapor.

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⚙ Under the hood

On-orbit refueling: fire a small ullage thrust to settle floating propellant against the tank outlet before pumping, and watch the Bond number decide whether the transfer runs clean or ingests vapor.

on-orbit servicingpropellant transferullage settlingmicrogravity fluidsBond numberspacecraft refuelingrendezvous and docking

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