wilson santos - Academia.edu (original) (raw)
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Papers by wilson santos
European Journal of Pharmacology, 2001
Brazilian Journal of Physics, 2007
Journal of Pharmacy and Pharmacology, 2003
European Journal of Pharmacology, 1996
Journal of The European Ceramic Society, 2008
The hot wire technique is considered to be an effective and accurate means of determining the the... more The hot wire technique is considered to be an effective and accurate means of determining the thermal conductivity of ceramic materials. However, specifically for materials of high thermal conductivity, the appropriate time interval to be considered in calculations is a decisive factor for getting accurate and consistent results. In this work, a numerical simulation model is proposed with the purpose of determining the minimum and maximum measuring time for the hot wire parallel technique. Nevertheless, the factor that limits the application of the hot wire technique for high thermal conductivity materials is the maximum measuring time for the experimental thermal transient registration. An alternative experimental arrangement is then proposed for materials with thermal conductivity higher than 15W/mK. In this technique, the time interval considered for the calculations may be several times bigger than that one corresponding to the parallel technique, what means in practice that it may be applicable for materials with higher thermal conductivities. Fourteen different specimens of refractory materials, and four polymers, with thermal conductivities ranging from 0.04 to 14W/mK, in shape of rectangular parallelepipeds were employed in the experimental programme. An empirical equation determining minimum and maximum measuring times is also obtained for the hot wire parallel technique. In this work is also proposed a technique of insulation of the hot wire, what makes possible its application to electrical conducting materials.
Polymer Testing, 2005
... As models become more sophisticated, there is an increasing need for reliable thermophysicalp... more ... As models become more sophisticated, there is an increasing need for reliable thermophysicalproperties data. ... impossible to prepare a small and representative sample, so that the measurement of this ... MathML source where: ρ=density, c=specific heat, α=k/ρc=thermal diffusivity ...
Polymer Testing, 2007
... a Department of Materials Engineering, Federal University of São Carlos, Via Washington Luiz,... more ... a Department of Materials Engineering, Federal University of São Carlos, Via Washington Luiz, km 235CP 676, São Carlos-SP, CEP 13565-905, Brazil. b School of Materials, University of Manchester and UMIST, Grosvenor Street, Manchester M1 7HS, UK. ...
Journal of Applied Polymer Science, 1996
Polymer Testing, 2005
... Thermal conductivity, thermal diffusivity and specific heat, namely the thermophysical proper... more ... Thermal conductivity, thermal diffusivity and specific heat, namely the thermophysical properties, are the three ... However, it is one of the physical quantities whose measurement is very difficult ... Reliable thermal properties values are essential for polymers, both in steady and non ...
Materials Research Bulletin, 2000
European Journal of Pharmacology, 2001
Brazilian Journal of Physics, 2007
Journal of Pharmacy and Pharmacology, 2003
European Journal of Pharmacology, 1996
Journal of The European Ceramic Society, 2008
The hot wire technique is considered to be an effective and accurate means of determining the the... more The hot wire technique is considered to be an effective and accurate means of determining the thermal conductivity of ceramic materials. However, specifically for materials of high thermal conductivity, the appropriate time interval to be considered in calculations is a decisive factor for getting accurate and consistent results. In this work, a numerical simulation model is proposed with the purpose of determining the minimum and maximum measuring time for the hot wire parallel technique. Nevertheless, the factor that limits the application of the hot wire technique for high thermal conductivity materials is the maximum measuring time for the experimental thermal transient registration. An alternative experimental arrangement is then proposed for materials with thermal conductivity higher than 15W/mK. In this technique, the time interval considered for the calculations may be several times bigger than that one corresponding to the parallel technique, what means in practice that it may be applicable for materials with higher thermal conductivities. Fourteen different specimens of refractory materials, and four polymers, with thermal conductivities ranging from 0.04 to 14W/mK, in shape of rectangular parallelepipeds were employed in the experimental programme. An empirical equation determining minimum and maximum measuring times is also obtained for the hot wire parallel technique. In this work is also proposed a technique of insulation of the hot wire, what makes possible its application to electrical conducting materials.
Polymer Testing, 2005
... As models become more sophisticated, there is an increasing need for reliable thermophysicalp... more ... As models become more sophisticated, there is an increasing need for reliable thermophysicalproperties data. ... impossible to prepare a small and representative sample, so that the measurement of this ... MathML source where: ρ=density, c=specific heat, α=k/ρc=thermal diffusivity ...
Polymer Testing, 2007
... a Department of Materials Engineering, Federal University of São Carlos, Via Washington Luiz,... more ... a Department of Materials Engineering, Federal University of São Carlos, Via Washington Luiz, km 235CP 676, São Carlos-SP, CEP 13565-905, Brazil. b School of Materials, University of Manchester and UMIST, Grosvenor Street, Manchester M1 7HS, UK. ...
Journal of Applied Polymer Science, 1996
Polymer Testing, 2005
... Thermal conductivity, thermal diffusivity and specific heat, namely the thermophysical proper... more ... Thermal conductivity, thermal diffusivity and specific heat, namely the thermophysical properties, are the three ... However, it is one of the physical quantities whose measurement is very difficult ... Reliable thermal properties values are essential for polymers, both in steady and non ...
Materials Research Bulletin, 2000