This study examined the effect of natural convection in the modified laser flash method for the measurement of thermo physical properties of semiconductor melts. Common laser flash method uses a laser pulse to heat the front surface of a thin circular sample and measures the temperature transient of the rear surface. Thermal diffusivity is calculated based on the analysis of the transient heat conduction process. For semiconductor melts, the sample is contained in a specially designed quartz cell with optical windows. When the laser pulse heats the melt front surface, the resulting natural convection can introduce errors in the calculation of thermal diffusivity based on the heat conduction model. The effect of natural convection was evaluated by Computational Fluid Dynamics (CFD) simulations in this study. The results indicated that natural convection can decrease the time needed for the rear surface to reach its peak temperature, and can also decrease the peak temperature slightly. Based on our experimental data for Tellurium, the calculation using only heat conduction model resulted in a thermal diffusivity about 3% greater than that using the heat transfer model with natural convection.
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ASME 2003 International Mechanical Engineering Congress and Exposition
November 15–21, 2003
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
0-7918-3718-1
PROCEEDINGS PAPER
Modified Laser Flash Method for Thermal Property Measurements and the Influence of Heat Convection Available to Purchase
Bochuan Lin,
Bochuan Lin
University of Alabama at Birmingham, Birmingham, AL
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Shen Zhu,
Shen Zhu
NASA Marshall Space Flight Center, Huntsville, AL
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Heng Ban,
Heng Ban
University of Alabama at Birmingham, Birmingham, AL
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Chao Li,
Chao Li
University of Alabama at Birmingham, Birmingham, AL
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Rosalia N. Scripa,
Rosalia N. Scripa
University of Alabama at Birmingham, Birmingham, AL
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Ching-Hua Su,
Ching-Hua Su
NASA Marshall Space Flight Center, Huntsville, AL
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Sandor L. Lehoczky
Sandor L. Lehoczky
NASA Marshall Space Flight Center, Huntsville, AL
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Bochuan Lin
University of Alabama at Birmingham, Birmingham, AL
Shen Zhu
NASA Marshall Space Flight Center, Huntsville, AL
Heng Ban
University of Alabama at Birmingham, Birmingham, AL
Chao Li
University of Alabama at Birmingham, Birmingham, AL
Rosalia N. Scripa
University of Alabama at Birmingham, Birmingham, AL
Ching-Hua Su
NASA Marshall Space Flight Center, Huntsville, AL
Sandor L. Lehoczky
NASA Marshall Space Flight Center, Huntsville, AL
Paper No:
IMECE2003-41734, pp. 163-169; 7 pages
Published Online:
May 12, 2008
Citation
Lin, B, Zhu, S, Ban, H, Li, C, Scripa, RN, Su, C, & Lehoczky, SL. "Modified Laser Flash Method for Thermal Property Measurements and the Influence of Heat Convection." Proceedings of the ASME 2003 International Mechanical Engineering Congress and Exposition. Heat Transfer, Volume 1. Washington, DC, USA. November 15–21, 2003. pp. 163-169. ASME. https://doi.org/10.1115/IMECE2003-41734
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