Estudo da pressão capilar entre envelope do evaporador capilar e a estrutura porosa cerâmica ante modificação de parâmetros dimensionais

Abstract

This project aims to study and determine the optimal mounting interference to a capillary evaporator with porous structure ceramic alumina / aluminum manufactured via reactive sintering technique. It will be used the technique of reactive sintering for the manufacture of porous structures, since this technique is known for low shrinkage after sintering of the structure and improves the mechanical properties of the structures. Then, these structures are identified via techniques of determining the density and porosity by Archimedes and Geometric, flexure 3 point resistance test, volumetric expansion and analysis of the fracture surface. Lastly, the structures are machined with different interference relationship for tests in a Loop Heat Pipe (LHP), in order to assess the capillary pressure of the system, through bubble test. The results show that increasing the amount of aluminum in the initial composition of the porous structure lead to an increase in density and mechanical resistance to bending after thermal treatment, moreover, the bubble test showed that a defined relationship interference led to pressures work that can be used in heat exchange systems, the pressures were 40 kPa and 80 kPa.