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Keywords: porosity
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Journal Articles
Article Type: Research-Article
J. Heat Transfer. April 2021, 143(4): 042102.
Paper No: HT-20-1479
Published Online: February 23, 2021
.... The solutions of governing equations show that the transfer of heat in a porous rod is not only due to the conduction but also produced by the local particle displacement phenomenon. It is observed that the time-averaged transfer of heat depends on the circular frequency, porosity, thermal...
Includes: Supplementary data
Journal Articles
Article Type: Research-Article
J. Heat Transfer. April 2021, 143(4): 041201.
Paper No: HT-20-1684
Published Online: February 22, 2021
... in blood perfusion, porosity, evaporation rate, and ambient temperatures has been constructed based on non-Fourier heat conduction law. Methods: The human eye has been divided into six layers. Appropriate boundary and interface conditions have been considered. A separable function has been assumed...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. January 2012, 134(1): 012602.
Published Online: November 29, 2011
... devices. Three sintered copper wick samples employed in commercial heat pipes are characterized in this work in terms of their thermal transport properties––porosity, effective thermal conductivity, permeability, and interfacial heat transfer coefficient. The commercially available samples of nearly...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. January 2012, 134(1): 012601.
Published Online: October 27, 2011
...–Forchheimer coefficient, tortuosity, and residence time distributions. These exhibit strong dependence on the bed morphological properties (e.g., porosity, specific surface area, particle size) and, consequently, vary with time as the reaction progresses. 16 04...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. November 2011, 133(11): 112602.
Published Online: September 19, 2011
...F. Kuwahara; C. Yang; K. Ando; A. Nakayama An effective porosity concept has been introduced to account for the effects of tortuosity and thermal dispersion on the individual effective thermal conductivities of the solid and fluid phases in a fluid-saturated porous medium. Using this effective...
Journal Articles
Article Type: Technical Briefs
J. Heat Transfer. October 2011, 133(10): 104501.
Published Online: August 15, 2011
...Krithiga Ganesan; Wojciech Lipiński Overall transmittance of porous cerium dioxide is measured in the spectral range of 900–1700 nm using dispersive spectroscopy. Dense and porous samples of cerium dioxide with average porosities of 0.08 and 0.72, respectively, are investigated. The transmittance...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. June 2011, 133(6): 062502.
Published Online: March 8, 2011
...Watit Pakdee; Phadungsak Rattanadecho Microwave heating of a porous medium with a nonuniform porosity is numerically investigated based on a proposed numerical model. A two-dimensional variation of porosity of the medium is considered. The generalized non-Darcian model developed takes into account...
Journal Articles
Article Type: Thermal Issues In Emerging Technologies
J. Heat Transfer. June 2011, 133(6): 060904.
Published Online: March 4, 2011
... electrically heated. The tested aluminum foams present 5, 10, 20 and 40 PPI (pores per inch), porosity around 0.92–0.93, and 0.02 m of foam core height. The experimental heat transfer coefficients and pressure drops have been obtained by varying the air mass flow rate and the electrical power, which has been...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. April 2011, 133(4): 042601.
Published Online: January 6, 2011
... numerical analysis porosity porous materials natural convection resonance bidisperse monodisperse porous media numerical simulations scale analysis Schematic of enclosure with 4 × 4 porous block array ( a ) geometry, ( b ) mesh, and ( c ) pulsating heat flux The...
Journal Articles
Article Type: Technology Review
J. Heat Transfer. March 2011, 133(3): 034001.
Published Online: November 16, 2010
... techniques include fiber bonding, electrospinning, emulsion freeze drying, solvent casting/particulate leaching, gas foaming/particulate leaching, high pressure processing, and thermally induced phase separation. Critical scaffold properties, including pore size, porosity, pore interconnectivity, and...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. March 2011, 133(3): 031005.
Published Online: November 15, 2010
...P. S. Wei Mechanisms for the formation of bead defects, such as humping, gouging, rippling, and other unexpected surface patterns, encountered in welding or drilling are interpreted and reviewed from thermal-fluid science viewpoint. These defects usually accompanying with porosity, undercut...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. July 2010, 132(7): 071401.
Published Online: April 22, 2010
... insert. Different metallic foams with various porosities and permeabilities are used in the numerical analysis. The effects of air flow Reynolds number and metal foam porosity and permeability on the overall Nusselt number, pressure drop, and the efficiency of heat sink are investigated. The results...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. February 2010, 132(2): 023305.
Published Online: December 3, 2009
... in direct pore-level simulations to numerically calculate their effective transport properties. Two-point correlation functions and mathematical morphology operations are applied for the geometrical characterization that includes the determination of porosity, specific surface area, representative...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. February 2010, 132(2): 023505.
Published Online: December 2, 2009
... transfer augmentation in an externally heated duct. Fibers composed of 140 μ m silicon carbide and 150 μ m stainless steel were assembled in arrays with porosities around 0.98, and were tested for empty-tube Reynolds numbers ranging from 17,500 to 112,500 and wall temperatures from ambient up to 750 ° C...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. October 2009, 131(10): 101004.
Published Online: July 28, 2009
...Indranil Ghosh High porosity open-cell metal foam is considered to be an attractive choice for compact heat exchanger applications because of its high area density and superior thermal performance. A systematic study has been made in the present article to verify the suitability of the porous...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. August 2009, 131(8): 082601.
Published Online: June 4, 2009
... as the working fluid, which is the most acceptable combination in electronic cooling applications. In the investigation, wick structures with different physical properties including thermal conductivity, pore radius, porosity, and permeability and with different structural topology including...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. July 2009, 131(7): 072701.
Published Online: May 4, 2009
... porosity, specific surface, pore and particle size distributions, and the representative elementary volume for continuum domain. The collision-based Monte Carlo method is applied to calculate the probability distribution functions for attenuation path length and direction of incidence at the fluid-solid...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. May 2009, 131(5): 052601.
Published Online: March 17, 2009
... the effects of maximum density, the Grashof number, the Schmidt number, porosity, and the Darcy number on buoyancy-induced flow and heat transfer. The finite volume method with power law scheme for convection and diffusion terms is used to discretize the governing equations for momentum, energy, and...
Journal Articles
Article Type: Technical Briefs
J. Heat Transfer. February 2009, 131(2): 024503.
Published Online: December 29, 2008
... forced convection. The porosity was from 0.98 to 1.0. The working fluid was air. The hydraulic equivalent diameter was cited as the characteristic length in the Nusselt number and the Reynolds number. The Nusselt number and the friction factor were expressed as functions of the Reynolds number and...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. December 2008, 130(12): 121501.
Published Online: September 23, 2008
... semiconductors evaporation heat pipes microprocessor chips porosity silicon statistical analysis thermal management (packaging) thermal resistance heat pipe vapor chamber nonuniform heating evaporative thermal performance silicon die heater Schematic of vapor chamber Schematics...