Influencia da vibração na permeabilidade absoluta de meios porosos saturados com agua / Influence of the vibration on the absolute permeability of porous media satured with water
AUTOR(ES)
Luiz Benedicto Pompeo Neto
DATA DE PUBLICAÇÃO
2004
RESUMO
This work verifies experimentally the effects of the mechanical vibration on the absolute permeability of saturated porous media upon which a uniform flow is simultaneously imposed. After finding a driving range within which indirect effects of the vibration are excluded, such as those resulting from ultrasonic heating and mechanical disintegration of the rock matrix, it was possible to verify that vibration at ultrasonic frequencies reduces the pressure drop across the sample and reduces the flow rate through it. The combination of amplitude of both these effects may result the improvement of the absolute permeability. Besides depending on the frequency, such changes depend on the velocity of the externally imposed flow. Analysis of the problem making use of continuum mechanics permitted introducing the description of a physical model, based on the concept of the viscous skin depth inversely proportional to the frequency. The mechanism is capable of explaining the observed behavior. The phenomena turned out to result from the elastic properties ? given the hydrodynamic properties ? of the system composed by the solid matrix together with the fluid, which fills and flows through the saturated porous medium
ASSUNTO(S)
elasticity ultra-som - vibração escoamento ultrasonics porous media flow elasticidade materiais porosos - permeabilidade
