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Keywords: thermal diffusivity
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Journal Articles
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Research-Article
J. Heat Mass Transfer. December 2019, 141(12): 121401.
Paper No: HT-19-1412
Published Online: October 8, 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 of interest for many decades due to practical cases such as frictional heating, heating of electric...
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Research-Article
J. Heat Mass Transfer. November 2012, 134(11): 111301.
Published Online: September 28, 2012
... that relaxation time of the substrate material, unlike the thermal diffusivity and thermal conductivity has very little effect on the transient thermal response in the TBC. The study further showed that for thin film structures subject to short time durations of heat flux, the hyperbolic model yields more...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. August 2011, 133(8): 081601.
Published Online: May 2, 2011
... that high thermal conductivity contrast between film and substrate is essential for making accurate measurements. Parker , W. J. , Jenkins , R. J. , Abbott , G. L. , and Butler , C. P. , 1961 , “ Flash Method of Determining Thermal Diffusivity, Heat Capacity, and Thermal...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Publisher: ASME
Article Type: Technical Briefs
J. Heat Mass 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. 05 02 2006 27 03 2007 boiling convection diffusion laminar flow laminar to turbulent...
Journal Articles
Publisher: ASME
Article Type: Technical Briefs
J. Heat Mass 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
Publisher: ASME
Article Type: Technical Briefs
J. Heat Mass 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
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Publisher: ASME
Article Type: Technical Briefs
J. Heat Mass 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
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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...