A comparison of time-scales governing the interaction and growth of hydrogen bubbles with a solidifying front

Karagadde, Shyamprasad and Dutta, Pradip (2016) A comparison of time-scales governing the interaction and growth of hydrogen bubbles with a solidifying front. In: INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 79 . pp. 16-20.

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Abstract

Elongated hydrogen porosity appears in aluminum based cast components and can lead to crack initiation. In this study, a comparison between the growth rates of hydrogen bubbles and the solidifying front during the process of engulfment is presented. Extending upon a previously developed order estimate for the ratio of growth rates of the two interfaces, it is found that dimensionless grouping leads to two distinct time scales that correspond to solidification and hydrogen diffusion. The analysis proves the hypothesized thought-experiment and explains the mechanism of hydrogen bubble elongation. The scaling prediction is also validated with available experimental studies, and shows that the rate of elongation varies directly with the pore radii and inversely with the cooling rates. (C) 2016 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
Additional Information:	Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	31 Jan 2017 05:28
Last Modified:	31 Jan 2017 05:28
URI:	http://eprints.iisc.ac.in/id/eprint/56121

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