旋转滚筒中制革过程的实验和计算流体动力学研究

IF 0.6 4区 工程技术 Q4 CHEMISTRY, APPLIED Journal of The American Leather Chemists Association Pub Date : 2023-11-01 DOI:10.34314/jalca.v118i11.8242
Yirui Lin, Zhoucheng Jiang, Ya-nan Wang, Yunhang Zeng, Guo Xie, Bi Shi
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引用次数: 0

摘要

化学品的质量传递在很大程度上影响着皮革生产的效率和产品质量。皮革在加工过程中会在旋转的滚筒中产生不同的运动,这与化学品的传质密切相关。然而,皮革运动如何影响传质仍不清楚,这不利于皮革生产过程的高效率。在此,我们通过调节转鼓转速来获得不同的皮革运动状态。实验结果表明,当转速从 5 r/min 提高到 20 r/min 时,皮革滚动运动的持续时间大大增加了 41%,鞣剂的吸收率也随之提高,这表明滚动运动有利于传质。计算流体动力学模拟结果表明,滚动运动下的传质速率高于滑动、提升和悬挂运动下的传质速率,这是因为滚动运动下皮革表面附近的流速和浓度梯度更高。因此,增加滚动运动可提高皮革加工中的传质效果。这项研究确定了有利于传质的皮革运动,为高效皮革生产的操作条件优化和转鼓设计提供了指导。
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Experimental and Computational Fluid Dynamics Investigation on Tanning Process in a Rotating Drum
Mass transfer of chemicals greatly affects leather production efficiency and product quality. Leather shows different motions in a rotating drum during processing, which is strongly associated with chemicals’ mass transfer. However, how leather motions affect mass transfer remains unclear, which disfavors highly efficient leather manufacturing process. Here, different leather motion states were obtained by adjusting the drum rotation speed. Experimental results showed that the duration of leather rolling motion greatly increased by 41% when the rotation speed increased from 5 r/min to 20 r/min, and the uptake of the tanning agent was consequently improved, which indicated that the rolling motion is beneficial to mass transfer. Computational fluid dynamics simulation results showed that the mass transfer rate under rolling motion was higher than those under slipping, elevating and hanging motions, because the flow velocity and concentration gradient near the leather surface were higher under rolling motion. Accordingly, increasing the rolling motion enhanced the mass transfer in leather processing. This work identifies the leather motion beneficial for mass transfer and provides guidance on operating condition optimization and drum design for high-efficiency leather production.
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来源期刊
Journal of The American Leather Chemists Association
Journal of The American Leather Chemists Association 工程技术-材料科学:纺织
CiteScore
1.30
自引率
33.30%
发文量
29
审稿时长
3 months
期刊介绍: The Journal of the American Leather Chemists Association publishes manuscripts on all aspects of leather science, engineering, technology, and economics, and will consider related subjects that address concerns of the industry. Examples: hide/skin quality or utilization, leather production methods/equipment, tanning materials/leather chemicals, new and improved leathers, collagen studies, leather by-products, impacts of changes in leather products industries, process efficiency, sustainability, regulatory, safety, environmental, tannery waste management and industry economics.
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