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Keywords: thermal diffusivity
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Journal Articles
Article Type: Research-Article
J. Heat Mass Transfer. June 2023, 145(6): 063501.
Paper No: HT-22-1410
Published Online: January 12, 2023
...S. Corasaniti; P. Coppa; M. Potenza; G. Bovesecchi Four probes for measuring thermal conductivity, thermal diffusivity, and convection heat transfer coefficient were designed, built, and tested. In two of these probes (SP-1 and SP-2), three thermocouples were placed at 25%, 50%, and 75...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. July 2021, 143(7): 072102.
Paper No: HT-20-1504
Published Online: May 17, 2021
...M. Potenza; P. Coppa; S. Corasaniti; G. Bovesecchi The laser-flash method (LFM) is a technique commonly used to measure thermal diffusivity of homogeneous and isotropic materials, but can also be applied to macroscopically inhomogeneous materials, such as composites. When composites present thermal...
Includes: Supplementary data
Journal Articles
Article Type: Research-Article
J. Heat Transfer. December 2019, 141(12): 121401.
Paper No: HT-19-1412
Published Online: October 8, 2019
...-mail:  avr.emanuel@gmail.com 14 07 2019 27 08 2019 00 00 0000 08 10 2019 circular heat source CHS composite Hankel Laplace thermal conductivity thermal diffusivity The problem of a three-dimensional (3D) heat flow from a finite circular heat source (CHS) has been...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. July 2014, 136(7): 071601.
Paper No: HT-13-1204
Published Online: March 17, 2014
... for the accurate, precise, and nondestructive thermal diffusivity determination of thin insulators. The similarity of previously determined in-situ CCD diffusivity values to those of the validation specimens provides confidence that accurate diffusivity results can be obtained testing HCCI CCD in the radiation...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. November 2012, 134(11): 111301.
Published Online: September 28, 2012
... thermal conductivity is high for a given TBC architecture. The substrate effect with respect to thermal diffusivity is not as pronounced as the effect of thermal conductivity even though the trends are similar. High relaxation times of the substrate, as Fig. 12 indicates, have very little effect...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. October 2011, 133(10): 101701.
Published Online: August 15, 2011
... displacement and the relative increase of thermal diffusivity are expressed in reduced algebraic form. Also presented are design formulas defining the specific driving power and the specific number of required tubes. Concerning the effective thermal diffusivity, the author’s predictions are fairly well...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. September 2011, 133(9): 091301.
Published Online: July 8, 2011
... for the effective thermal relaxation time are derived, while for a Neumann problem, only a heat capacity identity is found. In contrast in the short time regime, under both Dirichlet and Neumann conditions, an expression that involves the effective thermal diffusivity and relaxation time as a function of the time...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. August 2011, 133(8): 081601.
Published Online: May 2, 2011
... ≠ i . For bulk samples, our uncertainty is less than 14%, which is comparable to the uncertainty of TDTR and 3 ω . 01 06 2010 10 01 2011 02 05 2011 02 05 2011 photothermal effects thermal conductivity thermal conductivity measurement thermal diffusion...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. December 2010, 132(12): 121302.
Published Online: September 22, 2010
...Peter Vadasz The Kirchhoff transformation is the classical method of solution to the nonlinear thermal diffusion problem with temperature dependent properties. It essentially converts the nonlinear problem into a linear one if the thermal diffusivity is approximately constant. Unfortunately...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. June 2010, 132(6): 062301.
Published Online: March 24, 2010
... to Darcy’s law employed to model the porous-medium resistance. Local thermal equilibrium does not hold due to the large difference in thermal diffusivity between the metal foam and the PCM. Therefore, a two-temperature approach is adopted, with the heat transfer between the metal foam and the PCM being...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. February 2008, 130(2): 022601.
Published Online: February 4, 2008
...H. Sakamoto; F. A. Kulacki Transient heat transfer from an impulsively heated vertical constant heat flux plate embedded in a stationary saturated porous medium is studied experimentally and analytically to determine near-wall thermal diffusivity. The effective diffusivity is shown to depend...
Journal Articles
Article Type: Technical Briefs
J. Heat Transfer. December 2007, 129(12): 1737–1741.
Published Online: March 27, 2007
... of the bubbles is modeled by increasing the fluid momentum and thermal diffusivities by an enhancement factor. The results show that the CML has been able to model flow boiling in a realistic manner. In the CML method, dynamic processes are usually formulated in mappings. In the present model, it is assumed...
Journal Articles
Article Type: Technical Briefs
J. Heat Transfer. August 2007, 129(8): 1082–1086.
Published Online: December 7, 2006
... [Atomization and Sprays, 16 (6), pp. 907–932]. This finite conductivity model is based on the two-temperature film theory in which the turbulence characteristics of the droplet are used to estimate the effective thermal diffusivity for the liquid-side film thickness. Both one-way and two-way coupled...
Journal Articles
Article Type: Technical Briefs
J. Heat Transfer. June 2007, 129(6): 756–758.
Published Online: August 29, 2006
...Jean-Luc Battaglia; Andrzej Kusiak; Jean-Christophe Batsale The aim of this work is to provide an analytical expression for the thermal diffusivity of a material in the configuration of the picosecond photoreflectance experiment. It is shown that the thermal diffusivity can be estimated from...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. May 2007, 129(5): 624–633.
Published Online: June 28, 2006
... extinction coefficients thermal conductivity thermal diffusivity heat radiation thermo-optical effects radiation multiple scattering nanothermite metastable-intermolecular-composite nanoaluminum molybdenum-trioxide reactive-wave propagation Nanoenergetic materials show great promise...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. March 2007, 129(3): 379–386.
Published Online: May 11, 2006
... shrinkage drying thermal diffusivity thermal conductivity specific heat mass transfer temperature distribution partial differential equations convection least squares approximations food products inverse approach drying thermophysical properties heat and mass transfer coefficients...
Journal Articles
Article Type: Technical Briefs
J. Heat Transfer. November 2006, 128(11): 1217–1220.
Published Online: February 21, 2006
... technique is unique because it avoids determining the effective thermal diffusivity and quantifying the boundary heat flux. The technique is used to measure the effective thermal conductivity of glass-water, glass-air, and steel-air systems. These systems yield solid-fluid conductivity ratios of 1.08, 25.7...
Journal Articles
Article Type: Technical Papers
J. Heat Transfer. March 2005, 127(3): 315–322.
Published Online: March 24, 2005
... received December 12, 2003; revision received September 21, 2004. Review conducted by: K. Kihm. 12 December 2003 21 September 2004 24 03 2005 chromium aluminium gold platinum metallic thin films thermoreflectance phonon spectra thermal conductivity thermal diffusivity...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. September 2005, 127(9): 995–1004.
Published Online: November 13, 2004
...-Forchheimer extension to the Darcy law to model the porous resistance. Owing to the difference in the thermal diffusivities between the metal foam and the PCM, local thermal equilibrium between the two is not assured. Assuming equilibrium melting at the pore scale, separate volume-averaged energy equations...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. August 2004, 126(4): 628–637.
Published Online: March 24, 2004
... are filled with air, phase change materials, or other fluids. Local thermal equilibrium between the solid filler and the matrix is not ensured in such systems since their thermal diffusivities are frequently very different. The use of a single volume-averaged energy equation for both the phases cannot...