TY - GEN
T1 - Mass nature of heat and its applications IV
T2 - 2010 14th International Heat Transfer Conference, IHTC 14
AU - Wang, Haidong
AU - Ma, Weigang
AU - Zhang, Xing
AU - Wang, Wei
PY - 2010/12/1
Y1 - 2010/12/1
N2 - The ultra-fast heat transfer in metallic films has attracted great interest in modern femtosecond laser processing and metallic film manufacturing. Considering the unphysical infinite propagation speed of heat disturbances based on Fourier's model, some hyperbolic heat transfer models have been developed in the past decades, leading to the character of thermal wave in metallic films under ultra-fast laser heating conditions. In this paper the thermomass model is applied to obtain the governing equation for heat conduction in the thin films under pulsed laser heating, which is a damped wave equation and identical with that based on the Hyperbolic Two-Step (HTS) model. The semi-implicit Crank-Nicholson scheme is used to solve governing equations. Numerical results show that there may be two kinds of temperature oscillations existed in metallic films heated by ultra-short pulsed lasers, and the thermally oscillating boundary condition usually dominates over that caused by thermal wave induced oscillation of the electron temperature, which is validated by the measurement of the temperature response at the rear surface using a femtosecond laser pump-probe system. The measured electron temperature curve agrees well with the theoretically predicted one.
AB - The ultra-fast heat transfer in metallic films has attracted great interest in modern femtosecond laser processing and metallic film manufacturing. Considering the unphysical infinite propagation speed of heat disturbances based on Fourier's model, some hyperbolic heat transfer models have been developed in the past decades, leading to the character of thermal wave in metallic films under ultra-fast laser heating conditions. In this paper the thermomass model is applied to obtain the governing equation for heat conduction in the thin films under pulsed laser heating, which is a damped wave equation and identical with that based on the Hyperbolic Two-Step (HTS) model. The semi-implicit Crank-Nicholson scheme is used to solve governing equations. Numerical results show that there may be two kinds of temperature oscillations existed in metallic films heated by ultra-short pulsed lasers, and the thermally oscillating boundary condition usually dominates over that caused by thermal wave induced oscillation of the electron temperature, which is validated by the measurement of the temperature response at the rear surface using a femtosecond laser pump-probe system. The measured electron temperature curve agrees well with the theoretically predicted one.
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U2 - 10.1115/IHTC14-22368
DO - 10.1115/IHTC14-22368
M3 - Conference contribution
AN - SCOPUS:84860508119
SN - 9780791849385
T3 - 2010 14th International Heat Transfer Conference, IHTC 14
SP - 321
EP - 326
BT - 2010 14th International Heat Transfer Conference, IHTC 14
Y2 - 8 August 2010 through 13 August 2010
ER -