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Table 1 Summary of research on the rheology of slurries of microalgal cells

From: Rheological properties of concentrated slurries of harvested, incubated and ruptured Nannochloropsis sp. cells

Study Species Solids Concentration (w/w) Volume Fraction Findings
Wileman et al. [11], 1. Chlorella vulgaris,
2. Nannochloropsis sp.
0.05–8% The slurries were Newtonian fluids up to 2% solids above which they showed shear thinning behaviour.
Adesanya et al. [8], 1. Scenedesmus obliquus 6.8–15% The complex viscosity increased non-linearly with volume fraction; attributed to the deformable nature and mutual interaction between the cells in the suspension.
Zhang et al. [12], 1. Fresh water and marine Chlorella sp. 0.7–4.3% The high-shear viscosities were low, around 2 times the viscosity of water.
Bernaerts et al. [9], 1. Chlorella vulgaris,
2. Porphyridium cruentum,
3. Odontella aurita
8% All the suspensions were shear thinning weak elastic gels.
Cagney et al. [10], 1. Tetraselmis chuii,
2. Chlorella sp.
3. Phaeodactylum tricornutum,
5–20% The cell suspension viscosity increased with the volume fraction.
Wu and Shi [15], 1. Chlorella pyrenoidosa 2.5–25% The apparent viscosity of the cell suspension was rather low showing Newtonian behaviour until 15% solids above which the viscosity increased significantly (~ 1700 mPa.s at 25% solids) showing shear thinning behaviour.
Schnieder and Gerber [14] 1. Nannochloropsis salina 10–24% The suspensions were shear thinning
Chen et al. [13], 1. Chlorella pyrenoidosa 10–20% The apparent high-shear viscosity of a 20% solids suspension was around 40 mPa.s.
Yap et al. [16], 1. Nannochloropsis sp. 25% The presence of chitosan resulted in a floc structure that was broken by shear, hence the rheology was significantly affected by pre-shear history of the suspension.