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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Heat Transfer Research
Импакт фактор: 0.404 5-летний Импакт фактор: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Печать: 1064-2285
ISSN Онлайн: 2162-6561

Выпуски:
Том 50, 2019 Том 49, 2018 Том 48, 2017 Том 47, 2016 Том 46, 2015 Том 45, 2014 Том 44, 2013 Том 43, 2012 Том 42, 2011 Том 41, 2010 Том 40, 2009 Том 39, 2008 Том 38, 2007 Том 37, 2006 Том 36, 2005 Том 35, 2004 Том 34, 2003 Том 33, 2002 Том 32, 2001 Том 31, 2000 Том 30, 1999 Том 29, 1998 Том 28, 1997

Heat Transfer Research

DOI: 10.1615/HeatTransRes.2015009989
pages 49-69

ANNULAR THERMAL-WAVE DIFFUSING MEASUREMENT METHOD FOR LOCAL THERMAL DIFFUSIVITY EVALUATION

Huilong Dong
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Haidian District, Beijing 100084, P. R. China
Boyu Zheng
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Haidian District, Beijing 100084, P. R. China
Feifan Chen
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Haidian District, Beijing 100084, P. R. China

Краткое описание

An annular thermal-wave diffusing measurement method for local thermal diffusivity evaluation is reported. The local thermal diffusivity is calculated by fitting all specific theoretical equation parameters estimated from the original temperature evolutions of different ring areas of the sample. The proper time and space range for thermal diffusivity calculation is determined using the principal component analysis (PCA). Compared with the conventional method, that requires the calculation area large enough to perform a complete and reliable Gaussian temperature fitting, the main advantage of this method is that the thermal diffusivity of local area in the whole mechanical structure can be evaluated just by extracting the temperature evolutions close to the heat source center. A measurement system is established with a pulsed Gaussian beam heating the sample surface and an IR camera detecting the temperature distribution. The measured radial thermal diffusivity of local area near the center of samples prepared from both Ti and Ni is in good agreement with the reference data with a 1.3% error bound at maximum.


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