Browsing by Author "Dum, Paul"
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Item Excess Water in Astronaut Helmet During EVA on ISS: Mitigations with Flight Demonstrations(2023 International Conference on Environmental Systems, 2023-07-16) Weislogel, Mark; Krishcko, Oleg; Torres, Logan; Campbell, Colin; Dum, Paul; Graf, John; Rundle, TessaFollowing a second crew report of excess water inexplicably accumulating in the helmet during EVA-80 on March 23, 2022, NASA initiated an aggressive effort to identify, mitigate, and/or eliminate all sources of the potentially life-threatening water. Our narration highlights demonstrations of microgravity flow expectations using terrestrial scale models, mitigations to dangerous water migration within the helmet, low-g two-phase flow separations for the flow entering the helmet, and an investigation of the nature of liquid carry-over from the EMU condensing heat exchanger source. Fast-to-flight demonstrations of each aspect of the work are carried out during hands-on crew interaction with flight scale hardware on ISS during the 2022-2023 timeframe. The results of the tests are described with a focus on the rarely observed, and thus rarely studied, large length scale air-driven wall-bound droplet and rivulet two-phase flows in microgravity. The success of the mitigations and directions for continued work is discussed in summary.