Control of vortex structures of abnormally viscous fluids in the channels of the extrusion die
DOI:
https://doi.org/10.15587/2312-8372.2018.128478Keywords:
sudden narrowing of the channel, vortex structures, flow supply in the radial directionAbstract
The object of research is the vortex structures arising during the flow of anomalously viscous media in the channels of the forming equipment. One of the most problematic places is insufficient knowledge of the processes of origin and development of circulation flows. This is due to the fact that the hydrodynamic mechanisms of these processes are not completely understood. The reason for this is the lack of precise analytical solutions that allow describing the process model and choose the method of hydrodynamic control of vortex structures and on its basis to improve shaping equipment.
In the course of the research it is established that the most effective way to control the hydrodynamic flow characteristics in the region of the sharp narrowing of the channel is supplying additional fluid flow in the radial direction with respect to the main flow. The design of a extrusion die is developed, which allows to realize the mixing mode of components with improved technological and energy indicators. This is due to the fact that the proposed method for controlling vortex structures has a number of distinctive features, in particular, the extruded medium passes through the die channels in the form of a sudden constriction, and then along the course of the flow, cone expansion. The mixed technological component is fed radially into the region of the vortex structures with a reduced pressure zone. Due to this, it is possible to disrupt the vortex structures, turbulence of the flow and intensive mixing of the main and additional flows. In comparison with similar known equipment, the location of mixing devices and stationary turbulators is not provided in the die channels, which reduces the energy consumption for the extrusion process. In addition, it is possible to use a lower power pump to feed the process component to the base stream.
The developed device for the input of technological components into the extruded material is designed by the patent of Ukraine No. 201503942.
References
- Torner, R. V. (1977). Teoreticheskie osnovy pererabotki polimerov. Moscow: Khimiya, 462.
- Kutuzov, A. G., Kutuzova, G. S., Kutuzova, M. A., Garifullin, F. A. (2012). Bezvikhrevoe techenie vyazkouprugoy zhidkosti vo vkhodnom kanale ekstruzionnoy golovki. Vestnik Kazanskogo tekhnologicheskogo universiteta, 15 (21), 137–139.
- Clemeur, N., Rutgers, R. P. G., Debbaut, B. (2004). Numerical simulation of abrupt contraction flows using the Double Convected Pom–Pom model. Journal of Non-Newtonian Fluid Mechanics, 117 (2–3), 193–209. doi:10.1016/j.jnnfm.2004.02.001
- Boger, D. V., Hur, D. U., Binnington, R. J. (1986). Further observations of elastic effects in tubular entry flows. Journal of Non-Newtonian Fluid Mechanics, 20, 31–49. doi:10.1016/0377-0257(86)80014-3
- Verbeeten, W. M. H., Peters, G. W. M., Baaijens, F. P. T. (2001). Differential constitutive equations for polymer melts: The extended Pom–Pom model. Journal of Rheology, 45 (4), 823–843. doi:10.1122/1.1380426
- Cherry, E. M., Padilla, A. M., Elkins, C. J., Eaton, J. K. (2010). Three-dimensional velocity measurements in annular diffuser segments including the effects of upstream strut wakes. International Journal of Heat and Fluid Flow, 31 (4), 569–575. doi:10.1016/j.ijheatfluidflow.2010.02.029
- Kutuzova, E. R., Tazyukov, F. Kh., Khalaf, Kh. A. (2014). Dinamika techeniya vyazkouprugoy zhidkosti cherez ploskoe 8:1 suzhenie. Vestnik Kazanskogo tekhnologicheskogo universiteta, 17 (16), 83–85.
- Mackley, M., Rutgers, R. P., Gilbert, D. (1998). Surface instabilities during the extrusion of linear low density polyethylene. Journal of Non-Newtonian Fluid Mechanics, 76 (1–3), 281–297. doi:10.1016/s0377-0257(97)00122-5
- Miller, E., Rothstein, J. P. (2004). Control of the sharkskin instability in the extrusion of polymer melts using induced temperature gradients. Rheologica Acta, 44 (2), 160–173. doi:10.1007/s00397-004-0393-4
- Tazyukov, F. Kh., Kutuzova, E. R., Snegirev, B. A. (2014). Potoki vyazkouprugikh zhidkostey modeley OLDROYD-B i FENE-P. Vestnik Kazanskogo tekhnologicheskogo universiteta, 17 (18), 120–122.
- Tazyukov, F. Kh., Khalaf, H. A. (2010). Numerical simulation of the laminar flow of non-Newtonian fluid through a disk-type prosthetic heart value. Diyala Journal of Engineering Sciences, 26–39.
- Tatamikov, A. A., Burtelov, L. V. (2004). Generalies mathematical model of the throughput of the pressuie zone of an extruder. International Polymer Science and Technology, 31 (12), 72–75.
- Arda, D. R., Mackley, M. R. (2005). The effect of die exit curvature, die surface roughness and a fluoropolymer additive on sharkskin extrusion instabilities in polyethylene processing. Journal of Non-Newtonian Fluid Mechanics, 126 (1), 47–61. doi:10.1016/j.jnnfm.2004.12.005
- Nosko, S. V., Shevchuk, A. A. (2013). The structure of flow in the complex duct in a radial admission of escapages. Eastern-European Journal of Enterprise Technologies, 2 (7 (62)), 57–60. Available at: http://journals.uran.ua/eejet/article/view/12390
- Nosko, S. V., Mossiychuk, V. A. (2011). Issledovanie kinematicheskikh kharakteristik potoka v kanalakh litnikovoy sistemy metodami vizualizatsii. Vestnik NTUU «KPI». Mashinostroenie, 62, 79–82.
- Tager, A. A., Botvinnik, G. O., Dreval, V. E. (1970). Energiya i entropiya aktivatsii vyazkogo techeniya kontsentrirovannykh rastvorov polimerov. Moscow: Khimiya, 296.
- Mikaeli, V. (2007). Ekstruzionnye golovki dlya plastmass i reziny. Konstruktsii i tekhnicheskie raschety. Saint Petersburg: Profesiya, 472.
- Nosko, S. V., Shevchuk, A. A. (10.11.2015). Formuiuchyi prystrii dlia vvodu tekhnolohichnykh komponentiv v yekstrudovanyi material. Patent No. 102591 UA, MPK V29S47. Appl. No. 201503942. Filed: 24.04.2015. Bull. No. 21, 3.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2018 Ihor Ahaiev, Sergey Nosko
This work is licensed under a Creative Commons Attribution 4.0 International License.
The consolidation and conditions for the transfer of copyright (identification of authorship) is carried out in the License Agreement. In particular, the authors reserve the right to the authorship of their manuscript and transfer the first publication of this work to the journal under the terms of the Creative Commons CC BY license. At the same time, they have the right to conclude on their own additional agreements concerning the non-exclusive distribution of the work in the form in which it was published by this journal, but provided that the link to the first publication of the article in this journal is preserved.