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Simulation on Isothermal Expansion of Water Oversaturated Perlite  

Kim, Ji-Hwan (Department of Chemical Engineering, Dankook University)
Hahm, Yeong-Min (Department of Chemical Engineering, Dankook University)
Publication Information
Applied Chemistry for Engineering / v.18, no.5, 2007 , pp. 424-432 More about this Journal
Abstract
With the aiming to improve the comprehension of an expansion process of perlite, a numerical study has been carried out, concerning a water vapor bubble growth in a softened perlite melt. Isothermal case of the model is investigated and compared with the experimental results. Water content is an intrinsic parameter in a perlite expansion. With increasing water content, the expansion time is faster. But it can not be changed easily in an industrial process. Initial temperature is a changeable parameter in an industrial process. Higher initial temperature hastens the expansion time and this can be a key parameter in an industrial process. Experimental results are observed by SEM. Increasing initial temperature, perlite shape becomes close to sphere. Calculated bubble growth results are compared with experimental results. Packing density is measured and compared with simulated results. These results indicate that some other factors are applied on the model during heat transformation to work.
Keywords
perlite; simulation; isothermal; expansion;
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