Heat transfer mechanisms during short-pulse laser heating of two-layer composite thin films |
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Authors: | M A Al-Nimr M Alkam V Arpaci |
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Institution: | (1) Mechanical Engineering Department University of Jordan Amman, Jordan E-mail: malnimr@just.edu.jo, JO;(2) Mechanical Engineering Department Jordan University of Science and Technology Irbid, Jordan, JO;(3) Mechanical Engineering Department University of Michigan Ann Arbor, USA, US |
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Abstract: | Using a simple perturbation technique, an analytical investigation is presented for the heat transfer mechanisms during ultrafast
laser heating of two-layer composite thin slabs from a microscopic point of view. The composite slab consists of two thin
metal films which are in perfect thermal contact. The microscopic parabolic two-step model is adopted to describe the behavior
of the composite slab. In the microscopic two-step model, the heating process is modeled by the deposition of radiation energy
on electrons, the transport of energy by electrons, and the heating of the material lattice through electron–phonon interactions.
The proposed perturbation technique is used when the normalized temperature difference between the solid lattice and the electron
gas is relatively a small perturbed quantity.
Received on 20 September 2000 / Published online: 29 November 2001 |
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