DESIGN, SIMULATION AND VALIDATION OF A REDUCED PROTECTED HOT PLATE SYSTEM FOR THE DETERMINATION OF THERMAL CONDUCTIVITY OF POLYMERIC MATERIALS

Referencia Apresentador Autores
(Instituição)
Resumo
IVv12-001
Márcio Antônio Fiori Fiori, M.A.(Universidade Comunitária Regional de Chapecó); Pegoraro, K.(Universidade Comunitária da Região de Chapecó); Galli, R.(Universidade Comunitária da Região de Chapecó); Santos, A.L.(Universidade Comunitária da Região de Chapecó); Silva, L.L.(Unochapecó); Mello, J.M.(Unochapecó); The technology has evolved rapidly in the last decades in order to increase the knowledge regarding the thermal properties of the materials, in particular as regards their thermal conductivity. The thermal conductivity is the main property that influences the mechanisms of heat transfer in the materials. Polymers, for example, are materials that have gained great engineering space and have had a major impact on contemporary society. The Protected Hot Plate method is recognized worldwide as the main experimental technique for the determination of the thermal conductivity of low conduction materials, a typical feature of polymeric materials. However, even if it is reliable, its dimensions are not feasible for laboratory tests. Relatively large samples are required when compared to those commonly used in research areas of new engineering materials, making them difficult to manufacture and requiring large amounts of material. In this work, a laboratory - scale system was developed to determine the thermal conductivity of polymeric materials. For this, a study of the Protected Hot Plate method through simulations by the Flow Simulation tool of Solid Works Software and was carried out, designed according to the norms, specially by the standard ASTM C177 (2013). Through the simulations, it was possible to detect negative factors of the current method used for a laboratory environment. Therefore, proposals were made for improvements of the Protected Hot Plate method and observed results from simulations. As a proposal for improvement, the diameter of the test chamber was reduced by changing the sample size, diameter and thickness. As a consequence of this study, it was possible to prove that the reduction of the dimensions improves the homogeneity of the surface temperature distribution of the polymer samples and increases the reliability of the results. In addition, the test time for the permanent regime has decreased considerably in relation to the time proposed in the literature. Considering the results analyzed, the new test model was developed, called Reduced Hot Plate, which was designed and simulated by Flow Simulation of Solid Works Software and validated for the application in laboratory environments for the determination of conductivity polymeric materials, making the procedure more suitable for use in laboratory scale and more reliable in its results.
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