کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
657273 1458062 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A multiscale nonequilibrium model for melting of metal powder bed subjected to constant heat flux
ترجمه فارسی عنوان
یک مدل عدم توازن چندبعدی برای ذوب شدن پوشش پودر فلزی تحت شار گرما ثابت
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی

A multiscale numerical model based on nonequilibrium thermal effect for melting of metal powder bed subjected to constant heat flux is developed. The volume shrinkage due to density change is taken into account. The nonequilibrium model is discretized by an implicit finite difference method and solved numerically using an iterative tri-diagonal matrix algorithm. The evolutions of powder bed surface temperature and various interfacial locations as well as the melting temperature range during the melting process are investigated. The results show that liquid region, upper and lower parts of mushy zone are formed on the top of unsintered zone as the melting progresses. The duration of the preheating stage shortens and the melting rate accelerates as the initial porosity or initial temperature increases while particle size has much less effect on the melting process. The parametric study shows the melting temperature range of the powder bed widens with increasing initial porosity, decreasing initial temperature or increasing particle size.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 80, January 2015, Pages 309–318
نویسندگان
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