Experimental measurements and general conclusions on the effective thermal conductivity of powdered metal hydrides

1984 ◽  
Vol 104 (2) ◽  
pp. 287-295 ◽  
Author(s):  
E. Suissa ◽  
I. Jacob ◽  
Z. Hadari
Keyword(s):  
Thermal Conductivity ◽  
Effective Thermal Conductivity ◽  
Metal Hydrides ◽  
Experimental Measurements ◽  
Powdered Metal

scholarly journals On the temperature and pressure dependences of the effective thermal conductivity of granites

2020 ◽  
pp. 176-176
Author(s):  
Subkhanverdi Emirov ◽  
Abutrab Aliverdiev ◽  
Vetlugin Beybalaev ◽  
Anise Amirova
Keyword(s):  
Thermal Conductivity ◽  
Temperature Dependence ◽  
Effective Thermal Conductivity ◽  
Power Law ◽  
Atmospheric Pressure ◽  
Experimental Measurements ◽  
Pressure Behavior ◽  
Stationary Method ◽  
Temperature And Pressure ◽  
Granite Samples

The results of experimental measurements of the temperature dependence of the effective thermal conductivity of various granite samples obtained by the absolute stationary method in the temperature and pressure ranges of 273- 523 K and 0.1-400 MPa, respectively, are analyzed. The power-law character of the temperature dependence of the effective thermal conductivity for all measured granite samples at atmospheric pressure is established. We have shown that pressure significantly affects the power law of the temperature dependence of the effective thermal conductivity of granite samples. A low-parameter description of the temperature-pressure behavior of thermal conductivity is proposed. A correlation is established between its components.

Physics based models for metal hydride particle morphology, distribution, and effective thermal conductivity

2009 ◽  
Vol 1172 ◽  
Author(s):  
Kyle Christopher Smith ◽  
Timothy Fisher
Keyword(s):  
Thermal Conductivity ◽  
Particle Size ◽  
Effective Thermal Conductivity ◽  
Metal Hydride ◽  
Metal Hydrides ◽  
Particle Morphology ◽  
Particle Packing ◽  
Interparticle Contact ◽  
Storage Media ◽  
Particle Size And Shape

AbstractThis paper describes a modeling approach to target aspects of heat conduction in metal hydride powders that are essential to metal hydrides as viable H2storage media, including particle morphology distribution, size distribution, particle packing properties at specified solid fraction, and effective thermal conductivity. An isotropic fracture model is presented that replicates features of particle size and shape distributions observed experimentally. The discrete element method is used to simulate evolution of metal hydride particle contact networks during quasi-static consolidation of decrepitated metal hydride powders. Finally, the effective thermal conductivity of such a powder is modeled assuming that contact conductance is the same for each interparticle contact.

5015 Enhancing effective thermal conductivity of Metal Hydrides by metal coating

2006 ◽  
Vol 2006.3 (0) ◽  
pp. 371-372
Author(s):  
Sang-Chul BAE ◽  
Yang YANG ◽  
Yasuyuki IKEGAMI ◽  
Masanori MONDE
Keyword(s):  
Thermal Conductivity ◽  
Effective Thermal Conductivity ◽  
Metal Hydrides ◽  
Metal Coating

Kinetic Theory Analysis of Flow-Induced Particle Diffusion and Thermal Conduction in Granular Material Flows

1993 ◽  
Vol 115 (3) ◽  
pp. 541-548 ◽  
Author(s):  
S. S. Hsiau ◽  
M. L. Hunt
Keyword(s):  
Thermal Conductivity ◽  
Kinetic Theory ◽  
Granular Material ◽  
Effective Thermal Conductivity ◽  
Mixing Layer ◽  
Theory Model ◽  
Simple Shear Flow ◽  
Experimental Measurements ◽  
Material Flows ◽  
Analytical Relations

The present study on granular material flows develops analytical relations for the flow-induced particle diffusivity and thermal conductivity based on the kinetic theory of dense gases. The kinetic theory model assumes that the particles are smooth, identical, and nearly elastic spheres, and that the binary collisions between the particles are isotropically distributed throughout the flow. The particle diffusivity and effective thermal conductivity are found to increase with the square root of the granular temperature, a term that quantifies the kinetic energy of the flow. The theoretical particle diffusivity is used to predict diffusion in a granular-flow mixing layer, and to compare qualitatively with recent experimental measurements. The analytical expression for the effective thermal conductivity is used to define an apparent Prandtl number for a simple-shear flow; this result is also qualitatively compared with experimental measurements. The differences between the predictions and the measurements suggest limitations in applying kinetic theory concepts to actual granular material flows, and the need for more detailed experimental measurements.

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