Library Subscription: Guest
Begell Digital Portal Begell Digital Library eBooks Journals References & Proceedings Research Collections
Heat Transfer Research
IF: 0.404 5-Year IF: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Print: 1064-2285
ISSN Online: 2162-6561

Volumes:
Volume 51, 2020 Volume 50, 2019 Volume 49, 2018 Volume 48, 2017 Volume 47, 2016 Volume 46, 2015 Volume 45, 2014 Volume 44, 2013 Volume 43, 2012 Volume 42, 2011 Volume 41, 2010 Volume 40, 2009 Volume 39, 2008 Volume 38, 2007 Volume 37, 2006 Volume 36, 2005 Volume 35, 2004 Volume 34, 2003 Volume 33, 2002 Volume 32, 2001 Volume 31, 2000 Volume 30, 1999 Volume 29, 1998 Volume 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

ABSTRACT

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.