Rheological properties of natural waters with regard to plankton thin layers. A short review

Jenkinson, Ian R.; Sun, Jun

doi:10.1016/j.jmarsys.2010.04.004

Cited by 30 publications

(23 citation statements)

References 64 publications

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“…Indeed, in several realistic situations, such as in marine water or ponds [22], protozoa and algae swim in dilute suspensions of other microorganisms, in which exopolymeric substances (mostly consisting of high molecular weight polysaccharides) are dissolved [23]. The resulting dilute polymeric solution can therefore conveniently be modeled as a slightly viscoelastic fluid [22,23].…”

Section: Introductionmentioning

confidence: 99%

Locomotion of a microorganism in weakly viscoelastic liquids

2015

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In the present work we study the motion of microorganisms swimming by an axisymmetric distribution of surface tangential velocity in a weakly viscoelastic fluid. The second-order fluid constitutive equation is used to model the suspending fluid, while the well-known "squirmer model" [M. J. Lighthill, Comm. Pure Appl. Math. 5, 109 (1952); J. R. Blake, J. Fluid Mech. 46, 199 (1971)] is employed to describe the organism propulsion mechanism. A regular perturbation expansion up to first order in the Deborah number is performed, and the generalized reciprocity theorem from Stokes flow theory is then used, to derive analytical formulas for the squirmer velocity. Results show that "neutral" squirmers are unaffected by viscoelasticity, whereas "pullers" and "pushers" are slowed down and hastened, respectively. The power dissipated by the swimming microorganism and the "swimming efficiency" are also analytically quantified.

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Section: Introductionmentioning

confidence: 99%

Locomotion of a microorganism in weakly viscoelastic liquids

2015

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“…Reduced turbulence (within a TL or not) may promote some life-cycle transitions (pellicle cyst formation; e.g., Smith and Persson, 2005;Gentien et al, 2007) that are otherwise inhibited under highagitation conditions. Important research efforts have been designed to understand how viscosity and other rheological properties influence, and are influenced by, several aspects of plankton dynamics, including HABs (e.g., Jenkinson and Sun, 2010). Dense phytoplankton patches are often associated with increased viscosity as well as elasticity of the sea water or freshwater medium.…”

Section: Biological and Chemical Interactions At Small Scalesmentioning

confidence: 99%

Harmful Algal Blooms in Fjords, Coastal Embayments, and Stratified Systems: Recent Progress and Future Research

Berdalet¹,

Montresor²,

Reguera³

et al. 2017

Oceanog.

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“…Here, Re m calculated as _ γ:gap 2 ρ=η, where gap is measuring-gap size. Other values taken from Jenkinson (1993a) and Jenkinson and Sun (2010). 7.…”

Section: Notesmentioning

confidence: 99%

“…In narrow-gap Couette rheometry, that was used by Jenkinson (1993b), shearing takes place roughly uniformly across the measurement gap, so length scale is taken as equal to the gap size (Jenkinson and Sun, 2010).…”

Section: Comparison Of Rheological Properties Of Karenia Mikimotoi Cumentioning

confidence: 99%

“…The model finds that whether this EPS does influence thickness depends on how polymeric excess viscosity due to the EPS varies with length scale. Other phytoplankton and bacteria (Jenkinson and Sun, 2010;Seuront and Vincent, 2008;Seuront et al, 2010) increase viscosity in the ocean. We thus studied how viscosity in cultures of seven potentially harmful phytoplankton species and a bacterium, measured by flow in capillaries of five radii, from 0.35 to 1.5 mm, varied at measured values of hydrostatic pressure (allowing calculation of wall shear stress and hence shear rate).…”

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confidence: 99%

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