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| Cotta,Renato M.; Naveira-Cotta,Carolina P.; Genuchten,Martinus T.; Su,Jian; Quaresma,João N.N.. |
| Abstract: The Generalized Integral Transform Technique (GITT) was employed to simulate transient one-dimensional flow in variably saturated porous media, as well as radioactive waste transport within different layers (a solid waste pile, nearby soil, and a granular aquifer) towards the edge of a uranium mining installation under institutional control. Computational codes, written using the Mathematica software system, were implemented and tested for solution of the coupled advection-dispersion equations for an arbitrary number of daughter products within a radioactive chain migrating in saturated and unsaturated soil layers. The computer simulations were verified in great detail against results obtained using the built-in routine NDSolve of the Mathematica... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Uranium mining; Radioactive waste leaching; Unsaturated porous media; Physical non-equilibrium transport; Hybrid methods; Generalized Integral Transform Technique (GITT). |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000101102 |
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| Pinto,Cláudio S. C.; Massard,Henrique; Couto,Paulo; Orlande,Helcio R. B.; Cotta,Renato M.; Ambrosio,Maria C. R.. |
| The flash method, proposed by Parker, Butler, Jenkins and Abbott from the U.S. Navy Radiological Defense Laboratory in 1961, is the most popular method for measuring the thermal diffusivity of solids. In this method, the front surface of a small sample is subjected to a very short burst of radiant thermal energy. The resulting temperature rise on the opposite surface of the sample is measured and the thermal diffusivity is computed from the temperature rise versus time data. Also, the specific heat can be computed from the measured data, thus allowing for the calculation of the thermal conductivity. Several theoretical models are available for the flash method, which include adiabatic boundary conditions, heat losses, surface coating effects, among other... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Flash Method; Thermophysical Property; Ceramic block. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000200006 |
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