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Modeling nucleation and growth of bubbles during foaming of molten aluminum with high initial gas supersaturation

DSpace at IIT Bombay

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Title Modeling nucleation and growth of bubbles during foaming of molten aluminum with high initial gas supersaturation
 
Creator SAHU, SN
GOKHALE, AA
MEHRA, A
 
Subject Aluminum foam
Modeling
Bubble size distribution
Nucleation
Growth
CELLULAR STRUCTURE
LIQUID-STATE
PREDICTION
EXPANSION
SIMULATION
STABILITY
 
Description An idealized nucleation and growth based model was used to predict bubble size distribution in liquid aluminum foam, based on the assumption that the entire quantity of hydrogen added as TiH2 was retained in solution initially. The model considered simultaneous nucleation and growth of bubbles in the first stage, and pure bubble growth in the second stage. Bubble nucleation was found to be feasible only heterogeneously within narrow crevices in non wetting substrates. Effects of initial gas supersaturation on total expansion, final bubble size distribution, total number of bubbles, and average bubble size were investigated. Model predictions of foam characteristics were compared with experimental observations on foams prepared by dissociating TiH2 foaming agent in liquid aluminium, and good match between the two was found with respect to average cell size and total number of bubbles. Differences between model predictions and experimental observations, especially in the nature of bubble size distribution, and limitations of the model were explained. (C) 2013 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-12-29T05:06:00Z
2014-12-29T05:06:00Z
2014
 
Type Article
 
Identifier JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 214(1)1-12
0924-0136
http://dx.doi.org/10.1016/j.jmatprotec.2013.07.009
http://dspace.library.iitb.ac.in/jspui/handle/100/17150
 
Language English