Radiation diffusion was investigated as a heat transfer mechanism in highly absorbing microscale graphite. A 50\mum thick graphite sheet was heated by a 1064 nm Nd:YAG continuous wave (CW) laser with optical intensities of 10 kW/cm2 and 20 kW/cm2. Extremely high temperatures (i.e., \geq2000 K) were achieved on the graphite sheet within miliseconds, which were measured by a two-color pyrometer. The recorded temperatures were later compared with numerical solutions of differential heat conduction equation. A close match was found between numerical and experimental results only when radiation diffusion was incorporated in the thermal conductivity along with the lattice vibration.
|Original language||English (US)|
|Title of host publication||OMN 2019 - 2019 International Conference on Optical MEMS and Nanophotonics, Proceedings|
|Publisher||IEEE Computer Society|
|Number of pages||2|
|State||Published - Jul 2019|
|Event||2019 International Conference on Optical MEMS and Nanophotonics, OMN 2019 - Daejeon, Korea, Republic of|
Duration: Jul 28 2019 → Aug 1 2019
|Name||International Conference on Optical MEMS and Nanophotonics|
|Conference||2019 International Conference on Optical MEMS and Nanophotonics, OMN 2019|
|Country||Korea, Republic of|
|Period||7/28/19 → 8/1/19|
Bibliographical noteFunding Information:
ACKNOWLEDGEMENT This work was funded by the Directed Energy Joint Transition Office (DEJTO) and the Office of Naval Research under grants N00014-17-1-2438 and N00014-12-1-1030.
© 2019 IEEE.
- Radiation diffusion
- heat transfer
- photon diffusion