Han, Sang Heon Chang, Daejun Kim, Jong Soo 2024-01-20T09:33:18Z 2024-01-20T09:33:18Z 2022-01-25 2014-06 0360-3199 https://pubs.kist.re.kr/handle/201004/126704 The dispersion characteristics of hydrogen leaking through a small hole from a high-pressure source were investigated experimentally to develop guidelines for determining safety distances for hydrogen stations. Tests were carried out for leaking holes with diameters of 0.5, 0.7 and 1.0 mm and for release pressures of 100, 200, 300 and 400 bar. For these realistic hydrogen leaking conditions, the Froude numbers are so large that the buoyancy effect, manifested by the hydrogen jets bending upward, can be expected to be negligible. Flow visualization was performed using an Nd-YAG laser to confirm that the buoyancy effect was negligible. By letting a thin laser sheet penetrate the center line of a hydrogen jet conveying Al2O3 particles, the particles were illuminated and the hydrogen jet was visualized. The hydrogen concentration was measured by sampling hydrogen at five points along the jet centerline, based on the large Froude number. The measured data were always lower than the isentropic prediction. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD Experimental investigation of highly pressurized hydrogen release through a small hole Article 10.1016/j.ijhydene.2014.03.044 1 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.39, no.17, pp.9552 - 9561 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 39 17 9552 9561 N scie scopus 000336880500070 2-s2.0-84901190532 Chemistry, Physical Electrochemistry Energy & Fuels Chemistry Electrochemistry Energy & Fuels Article SCALE UNINTENDED RELEASES JET DIFFUSION FLAMES BUOYANCY MOMENTUM METHANE FIELD High-pressure hydrogen leakage Jet dispersion Small hole Safety distance