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NON-ISOTHERMAL NUMERICAL INVESTIGATIONS OF THE EFFECT OF SPEED RATIO AND FILL FACTOR IN AN INTERNAL MIXER FOR TIRE MANUFACTURING PROCESS

Ahmed, Istiaque
http://rave.ohiolink.edu/etdc/view?acc_num=akron1524584349185209

Abstract Details

2018, Master of Science in Engineering, University of Akron, Mechanical Engineering.
Three dimensional (3D) and two dimensional (2D), non-isothermal, transient Computational Fluid Dynamics (CFD) simulations are conducted for Carreau-Yasuda rubber mixing with a set of two-wing rotors in a partially filled chamber. The main objective is to analyze the effect of different fill factors of rubber and different speed ratios of rotors on dispersive and distributive mixing characteristics by simulating 15 revolutions of the rotors rotating at 20 rpm. 50%, 60%, 70%, 75%, 80% and 90% are the six different fill factors chosen for the 2D study. For 3D study, 60%, 70%, 75% and 80% fill factors of rubber are chosen. And a 2D case study with 1.0, 1.125 and 1.5 speed ratios of rotors are conducted to analyze their effects on dispersive and distributive mixing. An Eulerian multiphase model is employed to simulate two different phases, rubber and air, and the volume of fluid (VOF) technique is used to calculate the free surface between two phases, in addition to the continuity, momentum and energy equations. To characterize non-Newtonian, highly viscous rubber, shear rate and temperature dependent Carreau-Yasuda model has been used. A set of 2500 (for 2D study) and more than 3600 (for 3D study) massless particles are injected after a certain period of time to calculate several quantities in terms of dispersive and distributive mixing. Specifically, mixing index and cumulative distribution of maximum shear stress are assessed for the dispersive nature of mixing. Inter-chamber and axial particle transfer rates along with cluster distribution index (CDI), scale of segregation (SOS) and length of stretch (LOS) are calculated for investigating distributive nature of the mixing process. Viscous heat generation rate and change of molecular viscosity with time are calculated to see the rise of temperature inside the domain with time. Both the Eulerian and Lagrangian results showed that, fill factors between 70% and 80% and speed ratio of 1.125 presented the most reasonable and efficient mixing scenario, thus exhibiting the best dispersive and distributive mixing characteristics combined.
Abhilash J. Chandy (Advisor)
Scott Sawyer (Advisor)
Jae-Won Choi (Committee Member)
115 p.
Mechanical Engineering; Polymers
Mixing, Polymer Mixing, Non-isothermal, Non-Newtonian, Carreau-Yasuda Model, Dispersive Mixing, Distributive Mixing, Partially Filled, Internal Mixer, Rubber, Tire

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Citations

  • Ahmed, I. (2018). NON-ISOTHERMAL NUMERICAL INVESTIGATIONS OF THE EFFECT OF SPEED RATIO AND FILL FACTOR IN AN INTERNAL MIXER FOR TIRE MANUFACTURING PROCESS [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1524584349185209

    APA Style (7th edition)

  • Ahmed, Istiaque. NON-ISOTHERMAL NUMERICAL INVESTIGATIONS OF THE EFFECT OF SPEED RATIO AND FILL FACTOR IN AN INTERNAL MIXER FOR TIRE MANUFACTURING PROCESS. 2018. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1524584349185209.

    MLA Style (8th edition)

  • Ahmed, Istiaque. "NON-ISOTHERMAL NUMERICAL INVESTIGATIONS OF THE EFFECT OF SPEED RATIO AND FILL FACTOR IN AN INTERNAL MIXER FOR TIRE MANUFACTURING PROCESS." Master's thesis, University of Akron, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1524584349185209

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.