FREQUENCY RESPONSE CHARACTERISTICS OF FLOW OF GAS THROUGH POROUS MEDIA

A method is introduced to characterize a porous structure by a distributed parameter model along with Turner's dead-end pore model. The analysis of experimental data is carried out in the frequency domain. A transfer function is obtained from a set of partial differential equations which describe a system of fluid flow through porous medium. The experimental data were taken by applying a sinusoidal pressure on the one side of a porous medium, and measuring response pressure wave on the other side of a porous solid. Pulse testing technique was also employed, and the data were compared with that of thee direct sinusoidal forcing method. Although fairly good agreement between experimental and calculated frequency response data were obtained, the frequency range was limitted by the sensitivity of the measuring device and mechanical limitation of signal generator. The fraction of dead-end pores was calculated from measured frequency response data. A transfer function was derived for a gas separation cell which separates gas mixtures through porous barrier to study the separation dynamics. A method is also suggested which deduces a pore size distribution, by solving a matrix equation derived from a transfer function of distributed parameter model. © 1969.