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首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >STABILITY OF BIOCONVECTION IN SUSPENSIONS OF GYROTACTIC MICROORGANISMS IN POROUS MEDIA
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STABILITY OF BIOCONVECTION IN SUSPENSIONS OF GYROTACTIC MICROORGANISMS IN POROUS MEDIA

机译：多孔介质中悬浮液中悬浮微生物的生物对流稳定性

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摘要

In this paper, a model of bioconvection in a suspension of gyrotactic motile microorganisms in a fluid saturated porous medium is suggested. The microorganisms considered in this paper are heavier than water and gyrotactic behavior results in their swimming towards the regions of most rapid downflow. Because of that, the regions of downflow become denser than the regions of upflow. Buoyancy increases the upward velocity in the regions of upflow and downward velocity in the regions of downflow, thus enhancing the velocity fluctuations. The experiments performed by Kessler (1986) and the numerical results of Kuznetsov and Jiang (2001) indicate that if the permeability of porous medium is sufficiently small it will prevent the development of convection instability. However, for practical purposes, in order to maximize the flux of the cells in the upward direction it is desirable to have the permeability of the porous medium as high as possible. The aim of this paper is to investigate the value of critical permeability. If permeability is smaller than this critical value bioconvection does not occur and microorganisms simply swim in the upward direction.
机译：在本文中，提出了一种在流体饱和的多孔介质中的旋涡运动微生物悬浮液中的生物对流模型。本文中考虑的微生物比水重，并且回旋行为导致它们游向最快速下降的区域。因此，下流区域变得比上流区域更密集。浮力增加了在上流区域中的向上速度和在下流区域中的向下速度，从而增强了速度波动。 Kessler（1986）进行的实验以及Kuznetsov和Jiang（2001）的数值结果表明，如果多孔介质的渗透率足够小，它将阻止对流不稳定性的发展。然而，出于实际目的，为了使向上的孔的通量最大化，期望使多孔介质的渗透率尽可能高。本文的目的是研究临界渗透率的值。如果渗透率小于此临界值，则不会发生生物对流，而微生物只会在向上方向游动。

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