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Keywords: effective thermal conductivity
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Journal Articles
Article Type: Research-Article
J. Heat Transfer. March 2020, 142(3): 032101.
Paper No: HT-19-1405
Published Online: January 13, 2020
...Hao Wu; Nan Gui; Xingtuan Yang; Jiyuan Tu; Shengyao Jiang The core of high-temperature gas-cooled reactor is a dense pebble bed of random packing filled with monosized fuel spheres. Subcell radiation model (SCM) is a generic analytical approach to calculate effective thermal conductivity (ETC...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. August 2019, 141(8): 082001.
Paper No: HT-19-1057
Published Online: June 17, 2019
...Hao Wu; Nan Gui; Xingtuan Yang; Jiyuan Tu; Shengyao Jiang Radiative and conductive heat transfer is fairly important in the nuclear pebble bed. A continuum model is proposed here to derive the effective thermal conductivity (ETC) of pebble bed. It is a physics-based equation determined...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. July 2014, 136(7): 072601.
Paper No: HT-13-1410
Published Online: March 26, 2014
..., viz. , effective thermal conductivity and permeability, is analyzed. The effective thermal conductivity increases monotonically as either the sintering time or temperature is increased. Permeability is observed to increase with particle size and porosity. As sintering progresses, the slight increase...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. May 2013, 135(5): 051301.
Paper No: HT-12-1141
Published Online: April 11, 2013
...-storage tank with 16.4 m 3 water storage volume has been constructed, and the effective thermal conductivity of the perlite insulation has been determined from a heat loss measurement. The heat transport in evacuated perlite has also been treated theoretically using common models and approaches for gas...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. March 2012, 134(3): 031020.
Published Online: January 20, 2012
... to be addressed. 17 09 2010 23 04 2011 20 01 2012 20 01 2012 heat transfer hydrogen storage mass transfer reviews thermal conductivity metal hydride carbon heat and mass transfer hydrogen storage effective thermal conductivity Reliable and safe storage...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. March 2012, 134(3): 031015.
Published Online: January 18, 2012
... are available. Typically, however, empirical correlations are used to predict the variation in the porosity. Multisphere unit cell model In this study, the following approach was developed to extract the effective thermal conductivity from the data. The bed was divided into radial increments...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. January 2012, 134(1): 012602.
Published Online: November 29, 2011
... of such 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: Technical Briefs
J. Heat Transfer. October 2011, 133(10): 104504.
Published Online: August 19, 2011
... centrifuge. It was found that the heat pipe operated and performed near-independent of the investigated hypergravity loading up to 10 g. Results show that at ten times the acceleration due to gravity (10 g), the effective thermal conductivity was almost constant and even slightly increased which is very...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. August 2010, 132(8): 081601.
Published Online: June 2, 2010
... , “ Anomalously Increased Effective Thermal Conductivities of Ethylene Glycol-Based Nanofluids Containing Copper Nanoparticles ,” Appl. Phys. Lett. 0003-6951 , 78 , pp. 718 – 720 . 10.1063/1.1341218 Choi , S. U. S. , Zhang , Z. G. , Yu , W. , Lockwood , F. E. , and Grulke , E...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. November 2009, 131(11): 112402.
Published Online: August 26, 2009
... equation is 1 1 r s d d r [ k e r s d T d r ] = − t q ‴ where s and t values are listed in Table 1 for each of the four systems. k e is the effective thermal conductivity of nanofluids. Here we consider four types of nanofluids...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. August 2009, 131(8): 082601.
Published Online: June 4, 2009
... that the capillary limit of the capillary evaporator calculated from the mean pore radius will overestimate the thermal capacity of the LHP, which can be a serious design issue in electronic cooling. The effective thermal conductivity of the wick is a very important parameter to be considered during...
Journal Articles
Article Type: Micro/Nanoscale Heat Transfer—Part Ii
J. Heat Transfer. April 2009, 131(4): 043203.
Published Online: February 13, 2009
... of these studies are on the effective thermal conductivity under macroscopically stationary conditions. There are very few studies on the other aspects related to nanofluids such as phase change behavior (for example, Ref. 6 ) and convective heat transfer. Lee and Choi ( 7 ) estimated the performance...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. April 2008, 130(4): 042407.
Published Online: March 18, 2008
... a transient hot-wire method. The arguments that the methodology is the cause of the observed enhancement of nanofluids effective thermal conductivity are evaluated and resolved. It is clear from the results that at room temperature, both the steady-state cut-bar and transient hot-wire methods result in nearly...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. March 2008, 130(3): 032602.
Published Online: March 6, 2008
...Jörg Petrasch; Birte Schrader; Peter Wyss; Aldo Steinfeld The effective thermal conductivity of reticulate porous ceramics (RPCs) is determined based on the 3D digital representation of their pore-level geometry obtained by high-resolution multiscale computer tomography. Separation of scales...
Journal Articles
Article Type: Technical Briefs
J. Heat Transfer. November 2006, 128(11): 1217–1220.
Published Online: February 21, 2006
...H. T. Aichlmayr; F. A. Kulacki An experimental technique for measuring the effective thermal conductivity of saturated porous media is presented. The experimental method is based on the transient heating of a semi-infinite cylinder by a constant heat flux at the boundary. The data reduction...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. May 2006, 128(5): 465–477.
Published Online: October 7, 2005
... for estimating the effective thermal conductivity of suspensions that go back more than one century (Maxwell, J.C., 1891, Treatise on Electricity and Magnetism ). Nevertheless, other possible explanations have to be accounted for and investigated in more detail prior to reaching a final conclusion on the former...