• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1
  • Tagged with
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Transferência de calor e massa em sólidos porosos com geometria complexa via análise concentrada: modelagem e simulação. / Heat and mass transfer in porous solids with complex geometry via concentrated analysis: modeling and simulation.

LIMA, Wanderson Magno Paiva Barbosa de. 12 April 2018 (has links)
Submitted by Lucienne Costa (lucienneferreira@ufcg.edu.br) on 2018-04-12T19:16:29Z No. of bitstreams: 1 WANDERSON MAGNO PAIVA BARBOSA DE LIMA – DISSERTAÇÃO (PPGEM) 2017.pdf: 3865442 bytes, checksum: 6806587d90f466df06ed6f2d8853c1cc (MD5) / Made available in DSpace on 2018-04-12T19:16:29Z (GMT). No. of bitstreams: 1 WANDERSON MAGNO PAIVA BARBOSA DE LIMA – DISSERTAÇÃO (PPGEM) 2017.pdf: 3865442 bytes, checksum: 6806587d90f466df06ed6f2d8853c1cc (MD5) Previous issue date: 2017-09-01 / O processo de secagem consiste na remoção de umidade de um material através do aquecimento, envolvendo mecanismo simultâneo de transferência de calor e massa entre o material e o ar de secagem, sendo uma importante etapa na conformação de um material cerâmico e argiloso. Neste sentido, este trabalho objetiva a simulação da secagem de sólidos vazados e com forma arbitraria. Para descrever o processo de secagem de materiais porosos utilizou-se o método da capacitância global. A aplicação tem sido feita para a secagem de materiais cerâmicos afim de obter resultados cinéticos de perda de massa e calor dos mesmos. Foram simulados diferentes casos variando-se a forma do corpo, de onde obteve-se as cinéticas de secagem (perda da umidade) e aquecimento do sólido (aumento de temperatura). Observou-se que o processo de perda de umidade ocorre numa menor velocidade que o aquecimento do material cerâmico, pois a sua difusividade térmica é muito superior a difusividade de massa, e que o formato do sólido, particularmente a sua relação área/volume afeta fortemente os fenômenos de transporte de calor e massa. / The drying process consists of the removal of moisture from a material through heating, involving simultaneous heat and mass transfer between the material and the drying air, being an important step in the formation of a clay and ceramic material. In this sense, this work aims at simulating the drying of cast and cast solids. To describe the drying process of porous materials, the global capacitance method was used. The application has been made for the drying of ceramic materials in order to obtain kinetic results of loss of mass and heat of the same. Different cases were simulated by varying the shape of the body, from which the kinetics of drying (loss of moisture) and heating of the solid (temperature increase) were obtained. It was observed that the process of moisture loss occurs at a slower rate than the heating of the ceramic material, because its thermal diffusivity is much higher than mass diffusivity, and that the shape of the solid, particularly its area / volume ratio strongly affects The phenomena of heat and mass transport.

Page generated in 0.0674 seconds