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| Study on the Correlation between Flow Characteristics Based on Residence Time and Strain Rate and Refining Quality in the Refining Zone of a Disc Refiner |
| Received:December 24, 2025 Revised:January 24, 2026 |
| DOI：10.11980/j.issn.0254-508X.2026.06.024 |
| Key Words:disc refiner flow characteristics of pulp refining quality computational fluid dynamics |
| Fund Project:国家重点研发计划项目课题（2023YFD2201902）。 |
| Author Name | Affiliation | Postcode | | RAO Jiawei* | State Key Lab of Advanced Papermaking and Paper-based Materials, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | LI Jun | State Key Lab of Advanced Papermaking and Paper-based Materials, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | LIU Xiaowen | State Key Lab of Advanced Papermaking and Paper-based Materials, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | CHEN Fangjun | State Key Lab of Advanced Papermaking and Paper-based Materials, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | XIONG Qingang* | State Key Lab of Advanced Papermaking and Paper-based Materials, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 |
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| Abstract:To gain a deeper understanding of the relationship between the flow mechanism of pulp within the refining zone of a disc refiner and refining quality， this study combined computational fluid dynamics (CFD) simulations with refining experiments to investigate how the flow characteristics of pulp in refining discs with and without dams influence refining quality. By establishing correlations between the beating degree measured in refining experiments and the flow characteristics based on strain rate and residence time， a correlation model relating pulp flow characteristics to refining quality was developed to analyze quantitatively the effects of these two factors on beating degree. The results showed that the dams could regulate the flow direction and trajectories of the pulp within the refining zone， increasing the average residence time of the pulp from 0.593 s to 0.699 s， representing an increase of 17.9%， thereby improving refining quality. When the pulp simultaneously experienced a relatively high strain rate and a long residence time in the refining zone， the corresponding beating degree generally reached a higher level. A significant interaction between strain rate and residence time was observed， while excessively high strain rates did not continuously improve refining quality. When the strain rate reached approximately 660 s-1， a further increase in strain rate might suppress the further improvement of beating degree. The multi-parameter correlation model established in this study achieved a R2 value of 0.951 2. Under the process conditions of 3 kg/s of feed flow rate， 296 r/min of disc rotation speed， and 0.2 mm of discs gap， the predicted and experimental beating degree was 12.09 and 12.10 °SR, respectively， proving the established model had high prediction accuracy and reliability. |
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