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Volume 116
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Drawdown characteristics of irregular straw particles in the eccentric stirred tank
Yixi Wei a 1, Chao Song a 1, Xuejun Hu a, Da Chen a, Chang Chen a *, Guangqing Liu b *
a College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China b State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
10.1016/j.partic.2026.06.018
Volume 116, September 2026, Pages 227-239
Received 5 February 2026, Revised 10 June 2026, Accepted 12 June 2026, Available online 24 June 2026, Version of Record 8 July 2026.
E-mail: chenchang@mail.buct.edu.cn; gqliu@mail.buct.edu.cn
Highlights

• The mixing of floating corn straw in an eccentric stirred tank was investigated.

• Moderate eccentricity improved drawdown with a negligible increase in power.

• The higher solid-phase load hindered drawdown and increased power consumption.

• A symbolic regression model successfully predicted power consumption.


Abstract

The irregular, floating, hydrophobic, and porous characteristics of corn straw (CS) particles hinder effective mixing in non-Newtonian slurry, posing a major obstacle to efficient anaerobic digestion. This study systematically investigated the drawdown and mixing behavior of CS particles in an eccentric stirred tank using visual observation and image recognition techniques. The effects of eccentricity, off-bottom distance, blade angle, impeller diameter, solid phase load, particle size, and liquid viscosity on the complete drawdown speed, complete drawdown solid phase distribution uniformity, and complete drawdown power consumption were quantified. Results demonstrated that larger impeller diameters enhanced drawdown but increased power consumption. Higher solid phase loads and liquid viscosities significantly elevated both complete drawdown speed and power consumption. CS particles of 10-20 mesh exhibited better drawdown performance. A predictive power consumption model developed through dimensional analysis and symbolic regression achieved an R2 of 0.7547, and indicated that the power number was primarily governed by the Froude number and the solid phase load. This study provides practical guidance for optimizing mixing configurations in anaerobic digesters processing crop straw.

Graphical abstract
Keywords
Floating particles; Solid-liquid mixing; Eccentricity; Power consumption
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