کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7057153 1458067 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The isotherm migration method in spherical coordinates with a moving heat source
ترجمه فارسی عنوان
روش مهاجرت ایزوترم در مختصات کروی با یک منبع گرمای متحرک
کلمات کلیدی
روش مهاجرت ایزوترم، مشکل استیفن، تفاوت های محدود ردیابی ایزوترم پردازش مواد لیزری،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
An isotherm migration method is presented to track the isotherms at the surface of a semi-infinite workpiece that is being heated by a point source with a linear motion. The governing heat conduction equation is first transformed into a one-dimensional isotherm migration equation in spherical coordinates, which expresses the isotherm velocities as a function of the isotherm positions and their temperature derivatives. A finite difference formulation of this equation is then derived together with the corresponding boundary conditions. It is shown through a number of simulations that this system converges to the analytical solution when the temperature mesh is refined. The additional presence of a phase change results in a Stefan problem that can be solved approximately with some minor modifications to the method. The resulting system of equations can be used as a simple but accurate thermal model for some laser-material interaction processes such as laser heat treatments and laser cladding.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 75, August 2014, Pages 726-735
نویسندگان
, , ,