Measurements of capillary system degradationThe effects of vibration, flow transients, and warm gas pressurization on capillary acquisition system performance were evaluated. The degradation observed under wide band random and high frequency sinusoidal vibration was of a substantially different nature from that obtained under low frequency sinusoidal vibration. With the former, ingestion of small gas bubbles into the liquid region was correlated by a hydrostatic model, while the capillary stability was destroyed and liquid was lost from the liquid region with the latter. No degradation was observed as a result of flow transients in a flight-type multichannel screen device, but it was observed in a transparent laboratory device. Liquid hydrogen outflow tests were conducted with a multilayer dual-screen-liner system with both helium and hydrogen pressurant gases. The tendency towards dryout of the device with hydrogen pressurant was found to increase with increasing pressurant temperature and length of prepressurization period. Dryout did not occur with helium pressurant.
Document ID
19750061551
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Warren, R. P.
Butz, J. R.
Maytum, C. D.
Fester, D. A. (Martin Marietta Aerospace Denver, Colo., United States)
Young, G. M. (NASA Marshall Space Flight Center Huntsville, Ala., United States)