测量和校准质颗粒的离散元素参数在不同的水分含量
Zongyou Ben1,2, Xiao Sun2, Rui Zhu1
1College of Engineering, Nanjing Agricultural University, Nanjing, China.
Journal of food science
|February 8, 2024
概括
这项研究开发了一种新的方法来校准使用静止角度 (AoR) 和含水量 (MC) 的质颗粒的离散元素参数 (DEP). 这些模型基于MC准确预测DEP,改善了材料模拟.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 计算力学 计算力学 计算力学
背景情况:
- 离散元件方法 (DEM) 模拟需要对颗粒状材料提供准确的参数.
- 颗粒的特性,如含水量 (MC),显著影响它们的行为.
- 校准不同MC的DEM参数 (DEP) 对于可靠的模拟至关重要.
研究的目的:
- 建立一个快速校准方法,用于DEP的质颗粒具有不同的MC.
- 为了将静止角度 (AoR) 与MC和DEP相关联.
- 开发基于MC的DEP预测模型.
主要方法:
- 实验确定内在和接触参数,以及不同MC的质颗粒的AoR.
- 使用统计测试 (Plackett-Burman,最的上升,中心化合物) 开发了一个AoR-MC模型和一个AoR-DEP模型.
- 使用侧板提升方法推导和验证一个MC-DEP模型.
主要成果:
- 在不同的MC中观察到颗粒参数的显著差异 (p < 0.05).
- 建立了一个R2 = 0.987的AoR-MC模型和一个R2 = 0.969的AoR-DEP模型.
- 该MC-DEP模型实现了≤2.58%的相对误差,验证了校准方法.
结论:
- 成功开发了一种新且高效的方法,用于在不同的MC条件下校准质颗粒的DEP.
- 已建立的模型提供了准确的预测,使得可以更好地模拟颗粒状物质流.
- 这种方法提高了对湿度敏感颗粒系统的DEM模拟的可靠性.
相关概念视频
Moisture Content and Bulking of Aggregate
691
The moisture content of aggregates is a crucial factor in construction, particularly in concrete mixing, as it influences the total water required in the mix. Moisture content represents the water coated on the exterior surface of the aggregate existing in a saturated and surface-dry condition. The total water content of a moist aggregate is the sum of its moisture content and water absorption.
When aggregates are exposed to rain or sit in stockpiles, they absorb moisture, which must be...
When aggregates are exposed to rain or sit in stockpiles, they absorb moisture, which must be...
691
Measurement of Air Content in Concrete
938
Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
The pressure method,...
The pressure method,...
938
Microbial Growth Measurement: Indirect Methods
2.3K
Estimating microbial growth is essential for understanding population dynamics and environmental adaptations. Indirect methods provide valuable insights by measuring parameters such as turbidity, metabolic activity, and biomass, enabling efficient and reproducible assessments.During exponential growth, microbial cells scatter light proportionally to their biomass, a principle used in turbidity measurements. About one million cells per milliliter produce detectable scattering, which a...
2.3K


