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Flow friction ignition of non-metallic materials in oxygen is a poorly understood heat-generating mechanism thought to be caused by oxygen flow past a non-metallic sealing surface. Micron-scale fatigue cracks or channels were observed on non-metallic sealing surfaces of oxygen components and could provide a leak path for the high-pressure oxygen to flow across the seal. Literature in the field of micro-fluidics research has noted that viscous dissipation, a heat-generating mechanism, may not be negligible as the flow dimension of the channel is reduced to the micron-scale. Results of a computational fluid dynamics study are presented and used to determine if temperatures developed in high-pressure driven micro-channel oxygen flows are capable of reaching the reported autogenous ignition temperature of non-metallic materials in oxygen.
flow friction ignition, viscous heating, oxygen fires, microchannel flow, cylinder valves, CGA 870 seals, computational fluid dynamics, stagnation heating
Hooser, Jared D.
Wendell Hull and Associates, Inc., Las Cruces, NM
Assistant Professor, New Mexico State Univ., Las Cruces, NM
Newton, Barry E.
VP R&D, Wendell Hull and Associates, Inc., Las Cruces, NM
Chiffoleau, Gwenael J. A.
Senior Scientist, Test Facility Manager, Wendell Hull & Associates, Inc., Las Cruces, NM