Results 161 to 170 of about 1,430 (208)

Photo-gyrotactic bioconvection

Journal of Fluid Mechanics, 2011
Many microorganisms exhibit taxes, biased swimming motion relative to a directional stimulus. Aggregations of cells with densities dissimilar to the medium in which they swim can induce hydrodynamic instabilities and bioconvection patterns. Here, three novel and mechanistically distinct models of the interaction of the two dominant taxes in suspensions
Williams, C. R., Bees, M. A.
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Gyrotactic bioconvection in three dimensions

Physics of Fluids, 2007
The bioconvection equations, based on the continuum model of Pedley et al. [J. Fluid Mech. 195, 223 (1988)], consist of the Navier-Stokes equations for an incompressible fluid coupled with a micro-organism conservation equation. These equations are solved efficiently using a semi-implicit second-order accurate conservative finite-difference method. The
Ghorai, S., Hill, N. A.
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Bioconvection of gravitactic micro-organisms in rectangular enclosures

International Journal of Heat and Mass Transfer, 2007
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
E Bilgen
exaly   +4 more sources

Computational investigation of Stefan blowing and multiple-slip effects on buoyancy-driven bioconvection nanofluid flow with microorganisms

International Journal of Heat and Mass Transfer, 2016
The effects of Stefan blowing and the velocity, thermal and solutal slips on bioconvection nanofluid flow over a horizontal moving plate in the presence of passively controlled boundary conditions are numerically investigated.
Md Jashim Uddin, Muhammad Nomani Kabir
exaly   +2 more sources

Advances in Bioconvection

Annual Review of Fluid Mechanics, 2020
The term “bioconvection” describes hydrodynamic instabilities and patterns in suspensions of biased swimming microorganisms. Hydrodynamic instabilities arise from coupling between cell swimming behaviors; physical properties of the cells, such as density; and fluid flows.
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Gyrotactic bioconvection at pycnoclines

Journal of Fluid Mechanics, 2013
AbstractBioconvection is an important phenomenon in aquatic environments, affecting the spatial distribution of motile micro-organisms and enhancing mixing within the fluid. However, stratification arising from thermal or solutal gradients can play a pivotal role in suppressing the bioconvective flows, leading to the aggregation of micro-organisms and ...
Karimi, A., Ardekani, A. M.
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Bioconvection of gravitactic microorganisms in a fluid layer

International Communications in Heat and Mass Transfer, 2005
A study is made of the spontaneous pattern formation of gravitactic microorganisms in a horizontal fluid layer. The linear stability theory is used to determine the onset of convection in terms of the Rayleigh number and the swimming velocity. It is found that the onset of convection in a gravitactic suspension may be very different from that of Benard
A. Bahloul, T. Nguyen-Quang, T.H. Nguyen
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Bioconvective Dynamics: Dependence on Organism Behaviour

Journal of Experimental Biology, 2000
ABSTRACT Bioconvection occurs when a macroscopic nonuniformity of the concentration of microbial populations is generated and maintained by the directional swimming of the organisms. This study investigated the properties of the patterns near the onset of the instability and later during its evolution into a fully nonlinear convection ...
A, Czirók, I M, Jánosi, J O, Kessler
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An Optimal Control Problem for a Generalized Bioconvective Flow

Acta Applicandae Mathematicae, 2022
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Jose L. Boldrini, Rogério de Aguiar, Marko A. Rojas-Medar, Maria D. Rojas-Medar   +3 more
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Bioconvective percolation on an incomplete Voronoi grid

Journal of Physics A: Mathematical and General, 1995
Summary: Biconvection is a fluid instability common to many biological organisms including swimming bacteria, alga and protozoa. The statistics of biconvective pattern formation is tested against percolation models for space-filling. A percolation threshold is found \((p= 0.63)\) and compared to theoretical point distributions for random tesselations ...
Noever, David A., Cronise, Raymond J., Matsos, Helen C., Nikora, Vladimir I.   +3 more
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