کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
657299 1458062 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Three-dimensional simulation of an argon-hydrogen DC non-transferred arc plasma torch
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Three-dimensional simulation of an argon-hydrogen DC non-transferred arc plasma torch
چکیده انگلیسی
Simulations of a DC non-transferred arc plasma torch operating with argon-hydrogen have been performed by using a three-dimensional model. An artificially high electrical conductivity layer is employed to allow the current passing through the low temperature region near the anode wall. A new way by using two equations to describe the current density distribution is developed. Besides, a new method for determining the location of the arc-root attachment is proposed, in which the minimum total heat transfer rate through the anode wall is considered as the criterion for the lowest energy loss. Based on this criterion, the real arc core radius and length are predicted. Moreover, the influences of arc current and mass flow rate on the plasma arc characteristics are also investigated. The results obtained show that the location of the arc-root attachment predicted by the minimum total heat transfer rate principle is in good agreement with the previous work and the experimental data. Additionally, it is found that arc length can be reduced by increasing current or decreasing flow rate. Also, higher current and flow rate lead to higher temperature and velocity inside the plasma torch.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 80, January 2015, Pages 644-652
نویسندگان
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