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Boundary layer effects on the critical nozzle of hydrogen sonic jet

Abstract

When hydrogen flows through a small finite length constant exit area nozzle the viscous effects create a fluid throat which acts as a converging-diverging nozzle and lead to Mach number greater than one at the exit if the jet is under-expanded. This phenomenon influences the mass flow rate and the dispersion cloud size. In this study, the boundary layer effect on the unsteady hydrogen sonic jet flow through a 1 mm diameter pipe from a high pressure reservoir (up to 70 MPa) is studied using computational fluid dynamics with a large eddy simulation turbulence model. This viscous flow simulation is compared with a non-viscous simulation to demonstrate that the velocity is supersonic at the exit of a small exit nozzle and that the mass flow is reduced.

Related subjects: Safety
Countries: Canada
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/content/conference740
2015-10-19
2021-06-23
http://instance.metastore.ingenta.com/content/conference740
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Boundary layer effects on the critical nozzle of hydrogen sonic jet

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