Unknown

Dataset Information

0

Viscoelastic and shear-thinning effects of aqueous exopolymer solution on disk and sphere settling.


ABSTRACT: In this study, xanthan gum is used as a model exopolymer to demonstrate potential effects of non-Newtonian properties of natural aquatic systems on settling dynamics of particles. Rheological measurements combined with settling experiments using visualization methods revealed that instantaneous velocity fluctuations and a flow pattern formed around a particle are the effects of solution viscoelasticity and shear-thinning properties and that the average settling velocity depends on the exopolymer concentration and particle size. Our study showed that in the considered conditions a disk-shaped particle settles preferably in vertical position with a negative wake behind. The understanding of these processes is essential in technology and engineering and is necessary to improve prediction accuracy of large-scale sedimentation processes and biogeochemical cycles in the ocean involving settling of minerals, marine snow, microplastics, and locomotion of microorganisms.

SUBMITTER: Mrokowska MM 

PROVIDER: S-EPMC6536512 | biostudies-other | 2019 May

REPOSITORIES: biostudies-other

altmetric image

Publications

Viscoelastic and shear-thinning effects of aqueous exopolymer solution on disk and sphere settling.

Mrokowska Magdalena M MM   Krztoń-Maziopa Anna A  

Scientific reports 20190527 1


In this study, xanthan gum is used as a model exopolymer to demonstrate potential effects of non-Newtonian properties of natural aquatic systems on settling dynamics of particles. Rheological measurements combined with settling experiments using visualization methods revealed that instantaneous velocity fluctuations and a flow pattern formed around a particle are the effects of solution viscoelasticity and shear-thinning properties and that the average settling velocity depends on the exopolymer  ...[more]

Similar Datasets

| S-EPMC3607018 | biostudies-literature
| S-EPMC9781382 | biostudies-literature
| S-EPMC4624407 | biostudies-literature
| S-EPMC5384661 | biostudies-literature
| S-EPMC6723194 | biostudies-literature
| S-EPMC5545786 | biostudies-literature
| S-EPMC6774062 | biostudies-literature
| S-EPMC8086054 | biostudies-literature
| S-EPMC4895715 | biostudies-literature
| S-EPMC5972540 | biostudies-literature