相关实验视频
Updated: Jun 28, 2025

06:51
Film Extrusion of Crambe abyssinica/Wheat Gluten Blends
Published on: January 17, 2017
10.0K
了解聚合物挤压的动力学:用行星滚筒挤压器模拟热塑性塑料加工
Mario Radwan1, Steffen Schneider2, Thomas Ernst Müller2
1Ruhr-Universität Bochum, Virtualization of Process Technology, Universitätsstr. 150, 44801 Bochum, Germany.
Heliyon
|April 10, 2024
概括
这项研究利用3D模拟优化了行星滚筒挤出机中的聚合物加工. 关键的发现显示了轴数和速度控制材料应力和压力,减少了实验需求.
科学领域:
- 聚合物科学与工程 聚合物科学与工程
- 计算流体动力学的流体动力学.
- 材料加工 材料加工
背景情况:
- 资源效率高的聚合物加工对于最大限度地减少工业中的能源,时间和材料浪费至关重要.
- 星球滚筒挤出机用于聚合物加工,但详细的流动动力学需要进一步了解.
- 在这些挤出机内精确模拟聚合物流动对于过程优化至关重要.
研究的目的:
- 开发和验证一个三维 (3D) 数值流量模拟用于行星滚筒挤出机中的聚合物加工.
- 分析操作和材料参数对聚合物流动力学,材料应力和压力积累的影响.
- 建立一种计算方法,减少对广泛实验测试的需求.
主要方法:
- 使用ANSYS Polyflow软件开发了一个3D数值流动模拟.
- 直接可测量的参数 (例如压力) 和无形的参数 (例如材料剪切) 被量化.
- 根据不同的操作和材料参数进行了灵敏度分析.
- 模拟结果与实际的聚合物加工运行中的实验数据进行了验证.
主要成果:
- 子的数量和它们的旋转速度被确定为聚合物动态,材料应力和压力积累的主要控制器.
- 当达到关键的逆压长度时,3D模拟显示了与实验数据的强大一致.
- 这项研究首次成功验证了行星滚筒挤出机中聚合物流量的3D模拟.
结论:
- 3D数值模拟为理解和优化行星滚筒挤出机中的聚合物加工提供了可靠和高效的方法.
- 操作参数,特别是轴心配置和速度,显著影响工艺结果.
- 这种经过验证的计算方法可以大大减少聚合物工业中劳动密集型实验的努力.
相关概念视频
Rolling Resistance: Problem Solving
324
Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
324
Polymer Classification: Architecture
2.7K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
2.7K
Types of Step-Growth Polymers: Polyesters
2.2K
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
2.2K
Equation of Motion: General Plane motion - Problem Solving
183
Consider a lawn roller with a mass of 100 kg, a radius of 0.2 meters, and a radius of gyration of 0.15 meters. A force of 200 N is applied to this roller, angled at 60 degrees from the horizontal plane. What will be the angular acceleration of the lawn roller?
The friction between the roller and the ground is characterized by two coefficients. The static friction coefficient is 0.15, while the kinetic friction coefficient is 0.1. These values are crucial in understanding the interaction between...
The friction between the roller and the ground is characterized by two coefficients. The static friction coefficient is 0.15, while the kinetic friction coefficient is 0.1. These values are crucial in understanding the interaction between...
183
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
2.6K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.6K
Circular Shafts - Elastoplastic Materials
102
The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
As torque on the...
As torque on the...
102

