Stress analysis of blade Rheometry by DEM simulations

Nan, Wenguang; Gu, Yiqing

doi:10.1016/j.powtec.2020.08.026

Cited by 5 publications

(2 citation statements)

References 30 publications

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“…The target of the test was the rotor blade torque, and the rheological properties of mud were selected as the verification indicator (Han et al, 2021). A simplified model of the rheological test was constructed in EDEM software (Nan et al, 2020). The simulation test was performed on the calibrated optimal parameters, and blade torque data after smooth rotation of mud was derived.…”

Section: Validation Testmentioning

confidence: 99%

Analysis and Calibration of Parameters of Wet-Viscous Paddy Mud Particles Based on the Slump Experiment

Xiong

Zhu

et al. 2022

INMATEH

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In order to obtain the discrete element contact parameters of wet and viscous paddy field mud particles, an accurate numerical simulation model was constructed. Firstly,, the paddy field mud with an average particle size of 0.2 mm was taken as the research object, and the basic physical parameters and rheological behavior laws were obtained through physical measurements and rotational rheological tests. Based on the slump test, combined with the particle scaling theory and Johnson-Kendall-Roberts (JKR) model, and the slump and slump-flow values were taken as response values, the Plackett-Burman test, the steepest climb test and the Box-Behnken test were designed by Design-Expert software to complete the simulation parameters calibration. The optimal significance parameters are as follows: 0.096 J/m2 for the JKR surface energy of mud, 0.13 for the mud-mud restitution coefficient and 0.6 for the mud-steel static friction coefficient. Finally, the mud slump and fluidity verification tests showed that the relative errors between the simulation values and the physical values of slump and slump-flow are 1.73% and 0.42%, and the average error of torque is 2.47%, and the parameters are accurate and reliable. The calibration method can accurately construct the discrete element model of wet-viscous particles, which provides basic data and technical guidance for the coupling mechanism of paddy machinery-mud.

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Section: Validation Testmentioning

confidence: 99%

Analysis and Calibration of Parameters of Wet-Viscous Paddy Mud Particles Based on the Slump Experiment

Xiong

Zhu

et al. 2022

INMATEH

View full text Add to dashboard Cite

show abstract

“…Vivacqua et al [14] proposed a local rheological model relating the non-dimensional shear stress with the inertial number for various polyhedral shapes, interfacial energies and blade tip speeds. Nan & Gu [15] analysed the relationship between the shear stress in the local shearing region immediately in front of a twisted blade and the blade torque, and found it to be linear but proposed a rather complex mathematical model relating the two parameters for different particle aspect ratios, blade twisting angle and particle wall friction. Although, these constitutive local rheological models can predict homogeneous flows well, they lack the robustness to accurately predict spatially inhomogeneous flows, in which non-local effects contribute to the rheological response of the bulk material [16].…”

Section: Introductionmentioning

confidence: 99%