TED-AJ03-383 BIOCONVECTION IN POROUS MEDIA : EFFECT OF DEPOSITION AND DECLOGGING OF MICROORGANISMS ON THE CRITICAL PERMEABILITY VALUE

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概要

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• Bioconvection in porous media is an important phenomenon in many applications. Upswimming of algal cells can be utilized to concentrate the cells, to purify cultures, and to separate vigorously swimming subpopulations. Utilizing upswimming, it is also possible to separate dead and alive cells. For these applications, bioconvection is undesirable, because it would prevent upswimming cells from concentrating near the surface of the culture. The porous medium must satisfy two requirements; it must be sufficiently permeable to allow cells to swim through it but also sufficiently tight to damp out bioconvection. For practical purposes, it is desirable to have the permeability of the porous medium as high as possible (otherwise the microorganisms may cut their tails off while swimming through the porous medium). Also, having the permeability as high as possible maximizes the flux of the cells in the upward direction and reduces the duration of the process. The goal of this research is to investigate the effect of deposition and declogging of motile microorganisms in a fluid saturated porous medium on the development of bioconvection. If permeability of the porous medium is infinitely large (this correspond to the clear fluid case) an infinite suspension of gyrotactic microorganisms with uniform number density of the suspended cells is unstable. On the other hand, if permeability is very small, the system behaves as a solid body and therefore must be stable. This means that there is a critical permeability value that corresponds to marginal stability. This paper presents a model of bioconvection of gyrotactic motile microorganisms in a fluid saturated porous medium. The model takes into account the capturing of motile microorganisms by the porous matrix which results in their deposition on the matrix as well as their possible declogging. The focus of this research is the determination of how the rates of cell deposition and declogging affect the critical value of permeability.

• 一般社団法人日本機械学会の論文

著者

• Avramenko A.

  Institute Of Engineering Thermophysics National Academy Of Sciences

• KUZNETSOV A.

  Dept. of Mechanical and Aerospace Engineering, North Carolina State University

• Kuznetsov A.

  Dept. Of Mechanical And Aerospace Engineering North Carolina State University

関連論文

• Numerical modeling of a falling bioconvection plume in a porous medium
• TED-AJ03-383 BIOCONVECTION IN POROUS MEDIA : EFFECT OF DEPOSITION AND DECLOGGING OF MICROORGANISMS ON THE CRITICAL PERMEABILITY VALUE

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