相变颗粒转鼓中非满充颗粒休止角实验研究

李佳鹏; 齐晓霓; 屈晓航

doi:10.21656/1000-0887.450202

相变颗粒转鼓中非满充颗粒休止角实验研究

doi: 10.21656/1000-0887.450202

山东理工大学交通与车辆工程学院, 山东淄博 255000

基金项目:

国家自然科学基金 52276157

山东省优秀青年科学基金 ZR2023YQ048

详细信息

作者简介:
李佳鹏(1998—)，男，硕士生(E-mail: ljp5671017@163.com)

通讯作者:
屈晓航(1989—)男，教授，博士，博士生导师(通讯作者. E-mail: quxiaohang@outlook.com)

中图分类号: TP391
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- 文章访问数: 4
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- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2024-07-10
- 修回日期: 2024-09-20
- 网络出版日期: 2025-07-30
- 刊出日期: 2025-07-01

Experimental Study on the Dynamic Angles of Repose of Non-Fully Filled Phase Change Particles in a Rotating Drum

School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo, Shandong 255000, P.R.China

摘要

摘要: 以水为相变材料制作非满充球形颗粒，搭建转鼓实验装置，通过改变颗粒粒径、颗粒内相变材料的体积含量、转鼓填充率以及转速等参数，来探究颗粒内部相界面运动对转鼓中颗粒动态休止角的影响. 其中，休止角大小通过图像采集和MATLAB图像处理获得. 结果表明：相界面的运动会使部分颗粒出现滑移，提高颗粒流动性并使休止角随转速呈波动性变化；而随着体积含量的增加，颗粒流动性增强，休止角减小，转速对颗粒的作用逐渐减弱；此外，随着填充率降低或粒径增大，颗粒床层动态休止角减小，流动能力增强，但更易受相界面运动影响.
- 动态休止角 /
- 非满充颗粒 /
- 体积含量 /
- 相界面
Abstract: Spherical particles non-filled with water as the phase change material were fabricated. A rotating drum experimental setup was built. the influences of the motion of the phase interface inside the particles on the dynamic angles of repose of the particles in the rotating drum were investigated with varying particle diameters, volume fractions of the phase change material inside the particles, filling ratios of the rotating drum, and rotation speeds. The dynamic angle of repose was obtained through image capture and the MATLAB image processing. The results indicate that, the motion of the phase interface can cause some particles to slip, enhancing particle flowability and resulting in a fluctuating change in the resting angle with an increasing rotational speed. As the volume fraction increases, the flowability of the particles will improve, and the resting angle will decrease, while the effect of the rotational speed on the particles will gradually diminish. Furthermore, as the filling rate decreases and the particle size increases, the dynamic resting angle of the particle bed layer will decrease, the particle flow capacity will heighten, and the particle bed layer will be more susceptible to the phase interface motion.
- dynamic angle of repose /
- non-fully filled particle /
- volume fraction /
- phase interface

HTML全文

图 1 非满充球形颗粒示意图

Figure 1. Non-fully filled spherical particles

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图 2 实验装置示意图

Figure 2. The experimental device

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图 3 MATLAB图像处理流程

Figure 3. The MATLAB image processing flow

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图 4 可行性验证

Figure 4. The feasibility verification

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图 5 体积含量对休止角的影响

注为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.

Figure 5. Effects of the volume fraction on the angle of repose

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图 6 40 r/min和8 r/min休止角的差值

注为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.

Figure 6. The difference in the angle of repose between 40 r/min and 8 r/min

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图 7 填充率对不同体积含量下休止角的影响

Figure 7. Effects of filling rates on the angle of repose at different volume contents

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图 8 填充率对不同转速下颗粒休止角的影响

Figure 8. Effects of filling rates on angles of repose at different rotational speeds

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图 9 相界面晃动示意图

Figure 9. The schematic diagram illustrating the motion of the phase interface

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图 10 转鼓中颗粒的滑移

Figure 10. Slip of particles in the rotating drum

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图 11 粒径对不同体积含量下休止角的影响

Figure 11. Effects of particle sizes on angles of repose at different volume contents

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图 12 粒径对不同转速下休止角的影响

Figure 12. Effects of particle sizes on angles of repose at different rotational speeds

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表 1 不同粒径颗粒体积含量与球壳质量之比

Table 1. The ratios of the volume contents to the masses of the spherical shells at different particle sizes

particle size/mm	volume fraction
particle size/mm	25%	50%	75%	90%
15	0.12	0.3	0.4	0.51
20	0.74	1.46	2.06	2.45
25	1.46	2.33	2.45	2.76

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