Effect of wind and buoyancy on hydrogen release and dispersion in a compartment with vents at multiple levels

Published

November 30, 2010

Author(s)

Kuldeep R. Prasad, William M. Pitts, Jiann C. Yang

Abstract

The natural and forced mixing and dispersion of hydrogen released in an accidental manner in a partially enclosed compartment with vents at multiple heights is investigated using theoretical tools. The key to the analysis is determination of the position of neutral buoyancy plane, where the pressure in the compartment is equal to that of the exterior. Air flows in through vents below the position of neutral buoyancy and exits from vents above it. CFD simulations are conducted to confirm the physical phenomena and to compare with the analytical results. The analytical model is useful in understanding the important physical processes involved during hydrogen release and dispersion in a compartment with vents at multiple levels, with and without a steady wind. Parametric studies are conducted to identify the relative importance of various parameters. Model results indicate that the steady state hydrogen volume fraction in the compartment is lower when the hydrogen release rate is smaller and the vent crosssectional area is larger. Results also indicate that the fastest way to reduce flammable levels of hydrogen concentration in a compartment can be accomplished by blowing on the vents.

Citation

International Journal of Hydrogen Energy

Volume

35

Pub Type

Journals

Download Paper

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Keywords

Hydrogen Release, Compartment

Citation

Prasad, K. , Pitts, W. and Yang, J. (2010), Effect of wind and buoyancy on hydrogen release and dispersion in a compartment with vents at multiple levels, International Journal of Hydrogen Energy, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=905165 (Accessed April 4, 2025)