Microscale heat conduction

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Microscale heat transfer has drawn the attention of many researchers due to its importance in nanotechnology, information technology, and biotechnology. The traditional phenomenological laws, such as Fourier’s law of heat conduction, are challenged in the microscale regime because (1) the characteristic lengths of the various heat carriers are comparable to each other and to the characteristic length of the system considered, and/or (2) the characteristic times of the various heat carriers are comparable to the characteristic energy excitation time (Wang and Prasad, 2000). Thus, microscale heat transfer can be referred to as heat transfer occurring on both the micro-length and micro-time scales. Microscale heat transfer finds applications in thin film (micro- length scale) as well as ultra-short pulsed laser processing (micro- time scale). Compared to long pulsed laser processing, short-pulsed laser processing enables users to precisely control the size of the heat-affected zone, the heat rate, and the solidification speed.


Wang, G.X., and Prasad, V., 2000, “Microscale Heat and Mass Transfer and non-Equilibrium Phase Change in Rapid Solidification,” Materials Science and Engineering, A., Vol. 292, pp. 142-148.

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