Heat transfer mechanisms governing laser metal interactions

(1993) Heat transfer mechanisms governing laser metal interactions. Masters thesis, King Fahd University of Petroleum and Minerals.

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English Abstract

The thesis describes the modelling of laser heating of metals for conduction as well as convection cases. Application of Electron Kinetic Theory in laser heating process, including heat conduction, melting and evaporation, is carried out. The energy equation developed using this theory is numerically solved for the appropriate boundary conditions. This makes possible to compare the results obtained from the classical work (Fourier Theory), previously studied, with the Kinetic theory results. The energy equation resulting from the Electron Kinetic Theory is solved numerically using the explicit finite difference method. The stability problem is of concern and by careful choice of the space and time increments is controlled effectively. In the numerical scheme, forward differences are used for the derivatives. In the final art of the work, the various laser pulses are considered and introduced in the energy equation. To achieve these various pulse profiles, a mathematical function describing the actual laser pulse is employed. Consequently the results obtained for continuous and pulse heating are compared. The effect of the laser pulse shape on the temperature profile is also studied and different pulse shapes are compared from the point of view of laser machining. This may provide useful information to laser designer to design more efficient laser beams required for laser machining.

Item Type: Thesis (Masters)
Subjects: Mechanical
Divisions: College Of Engineering Sciences > Mechanical Engineering Dept
Committee Advisor: Yilbas, Bekir Sami
Committee Members: Al-Farayedhi, Abdulghani A. and Sahin, Ali
Depositing User: Mr. Admin Admin
Date Deposited: 22 Jun 2008 17:03
Last Modified: 01 Nov 2019 17:00
URI: http://eprints.kfupm.edu.sa/id/eprint/10369