STUDY OF THE DYNAMIC STABILITY OF THE LIQUID-GAS INTERFACES IN MICRON SIZED PORES
This paper is focused on the investigation of the liquid-gas (or vapor) interface, which occurs in very small diameter pores. A static augmented Young-Laplace model is first developed to simulate the static liquid-gas interface in micron sized and sub-micron sized pores. This static model can be used to calculate the meniscus profiles and determine the range of the pore size where disjoining/conjoining pressure is large enough to change the interface shape. A dynamic model is also developed to simulate the movements of a liquid column trapped in a capillary pore. The Navier-Stokes equations are applied to the liquid side with assumed no-slip conditions, while the Young-Laplace equation is used to calculate the shape of the interface. The dynamic model calculates both velocity profiles in the liquid side and transient profiles of the interface itself; and of particular interest, it predicts the pressure difference, oscillation frequency and amplitude required to burst this interface. These predicted parameters are examined by the experiments with both oscillating Coherent Porous Silicon (CPS) wicks and porous Lexan wicks. This research helps better understanding the phenomena such as multiphase flow in porous media or de-watering process that happens in vibro-separators.
School:University of Cincinnati
School Location:USA - Ohio
Source Type:Master's Thesis
Keywords:vibration meniscus dynamic stability
Date of Publication:01/01/2003