Flow behavior analysis of Chlorella Vulgaris microalgal biomass

• Main Authors: Suresh Kumar Yatirajula, Anuj Shrivastava, Vinod Kumar Saxena, Jagadeeshwar Kodavaty
• Format: Article
• Language: English
• Published: Elsevier 2019-06-01
• Series: Heliyon
• Subjects: Chemical engineering; Energy; Rheology; Viscosity; Algae; Chlorella
• Online Access: http://www.sciencedirect.com/science/article/pii/S2405844018362996

The processing volume of bioengineering operations requires flow properties of algal mass for effective processing techniques. Chlorella Vulgaris microalgae cultured at 25°C in Tap media under continuous illumination was considered. It showed an exponential phase of growth up to 8 days and then a stationary phase of growth from 8 days to 15 days. The rheological properties of microalgae biomass during the growth represented power law model. Microscopic analysis showed the influence of shearing on variation of algal structure from clusters to complete cell separation. The flow properties supported the microscopy analysis showing the shear thickening property at high shear rates and shear thinning nature at low shear regime. Optimal power required for the agitation of biomass based on the variations of non-Newtonian viscosity were predicted by considering the vessel geometry.