نوع مقاله : مقاله پژوهشی
نویسندگان
دانشگاه تهران
چکیده
اختلاط یکی از مراحل اولیه و ضروری در فرآیند صنعتی ساخت لاستیک است. هدف اصلی اختلاط شامل ترکیب مواد، افزودن انرژی برای شکستن پیوندهای مولکولی و ادغام مواد با هوا است. پارامترهای عملیاتی مختلفی در کیفیت اختلاط تأثیرگذار است. تحقیق حاضر بر روی شبیه‌سازی غیر همدمای اختلاط لاستیک در یک میکسر بنبوری انجام شده است. مطالعات عددی سه‌بعدی با استفاده از دینامیک سیالات محاسباتی به منظور دسترسی به اثر پارامترهای عملیاتی مختلف انجام شده است. حرکت روتورها در محاسبات از طریق تکنیک مش لغزان انجام شده است و روش حجم سیال مبتنی بر رویکرد اویلری برای ردیابی سطح مشترک بین فاز لاستیکی و هوا استفاده شده است. مدل ویسکوزیته غیر نیوتنی کریو-یاسودا همراه با یک فرمول آرنیوس برای تعیین ویسکوزیته وابسته به دمای لاستیک استفاده شده است. نتایج این تحقیق نشان می‌دهد که ویسکوزیته بالای لاستیک منجر به گرمایش ویسکوز می‌شود. این پدیده، به‌ویژه در ناحیه باریک بین نوک روتور و دیواره که نرخ برش بالایی وجود دارد موثر است و این عامل بر ویسکوزیته و ویژگی‌های جریان لاستیک تأثیر می‌گذارد.
کلیدواژه‌ها
عنوان مقاله [English]
Simulation of Non-Isothermal Flow of Rubber in Banbury Mixer Using Computational Fluid Dynamics
نویسندگان [English]
- Zahra Mansourpour
- Mohammad Falahati
چکیده [English]
Mixing is one of the first and necessary steps in the industrial process of rubber production. The main purpose of mixing involves combining materials, adding energy to break the molecular bonds, and combining materials with air. Executive operation is effective in the mixing quality. The present research is on the non-isothermal simulation of mixing in a Banbury mixer. Three-dimensional numerical studies, using computational fluid dynamics, have been carried out in order to use different operational parameters. The movement of the surfaces in the calculations has been considered through the sliding mesh technique, and the fluid volume method has been used in the Eulerian approach to track the interface between the rubber phase and air. The carreau-Yasuda non-Newtonian viscosity model, along with an Arrhenius formula, has been used to determine the temperature-dependent viscosity of rubber. The results of this research show that the high viscosity of rubber becomes viscous when heated. This phenomenon is especially in the narrow area between the tip of the rotor and the wall, where there is a higher shear, and this factor affects the viscosity and flow characteristics of the rubber.
کلیدواژه‌ها [English]
- mixing
- computational fluid dynamics
- viscous heating
- rubber
- banbury
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