Calculation and investigation of temperature distribution and melt pool size due to a moving laser heat source using the solution of hyperbolic heat transfer equation
Publish Year: 1389
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ICME11_077
تاریخ نمایه سازی: 3 مرداد 1389
Abstract:
In this paper, the melting of a semi-infinite body as a result of a moving laser beam has been studied. Because the Fourier heat transfer equation at short times and large dimensions does not have sufficient accuracy; a non-Fourier form of heat transfer equation has been used. Due to the fact that the beam is moving in x direction, the temperature distribution and the melting pool shape are not asymmetric. As a result, the problem is a transient three-dimensional problem. Therefore, thermophysical properties such as heat conductivity coefficient, density and heat capacity are functions of temperature and material states. The enthalpy technique, used for the solution of phase change problems, has been used in an explicit finite volume form for the hyperbolic heat transfer equation. This technique has been used to calculate the transient temperature distribution in the semi-infinite body and the growth rate of the melt pool. Temporal variation of laser beam intensity in two cases of continuous and pulsatile heat flux has been considered. The latter case is a model of electrical discharge machining (EDM). In order to validate the numerical results, comparisons were made with experimental data. Finally, the results of this paper were compared with similar problem that has used the Fourier theory. The comparison shows the influence of infinite speed of heat propagation in Fourier theory on the temperature distribution and the melt pool size.
Keywords:
Electrical Discharge Machining (EDM) , Non-Fourier , unsteady , enthalpy technique , melt pool , radiational boundary condition
Authors
Mohammad Akbari
PhD student, Faculty of Mechanical Engineering,Semnan University
Seifollah Sadodin
Assistant Professor, Faculty of Mechanical Engineering,Semnan University
Ali Jahangiri
PhD student, Faculty of Mechanical Engineering,Semnan University
Ehsan Rasti
PhD student, Faculty of Mechanical Engineering,Semnan University
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