In this work, a new curved Rushton turbine (CRT) is investigated in terms of the effects of the reactor size, impeller clearance, and rheological properties of the biopolymer solutions on the power consumption in unbaffled reactor vessels. The results show that the power consumption can be adequately predicted for the given scale geometries. In a logarithmic plot, the power curves of two scales agitated with different concentration solutions in the laminar regime (Re-g < 9) perfectly overlap as a straight line with a -1 slope, which shows an agreement with the literature. The scale power constant Kp of the curve impeller is slightly smaller than the classical Rushton (RT) impeller in the literature. The clearances C = 0.33T with the CRT could effectively eliminate the dead zones, which confirms that the new impeller agitation within an unbaffled reactor vessel could be regarded as an adept impeller for industrial applications. (C) 2020 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.