EFFECTS OF MELT TEMPERATURE AND NON-ISOTHERMAL FLOW IN DESIGN OF COAT HANGER DIES BASED ON FLOW NETWORK OF NON-NEWTONIAN FLUIDS

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dc.contributor.authorRazeghiyadaki, Amin
dc.contributor.authorWei, Dongming
dc.contributor.authorPerveen, Asma
dc.contributor.authorZhang, Dichuan
dc.contributor.authorWang, Yanwei
dc.date.accessioned2023-07-03T07:37:02Z
dc.date.available2023-07-03T07:37:02Z
dc.date.issued2022
dc.description.abstractIn the design of coat hanger extrusion dies, the main objective is to provide a uniform flow rate at the die exit. Previously, a multi-rheology isothermal method model for coat hanger extrusion dies was developed to reach this objective. Polymer melts in extrusion dies commonly experience high shear rates. Viscous dissipation rooted by high shear rate may lead to significant temperature differences across the die. Due to temperature-dependency of viscosity, temperature differences may lead to nonuniform flow rates, which may significantly affect the flow rate at the die exit. As a result, a new design method is proposed to take into account the effects of temperature and viscous dissipation in the design of coat hanger dies. Although more non-Newtonian fluid rheology models can be adapted in the proposed study, as demonstration, temperature-dependent power-law and Carreau–Yasuda models are adapted in this study. Performances are compared with our isothermal method published earlier. In addition, the novel nonisothermal method is comprehensively examined where the effect of viscous dissipation is studied through Brinkman number of extrusion die. It is demonstrated that, for a low Brinkman number, both isothermal and nonisothermal design give similar flow uniformity level. However, for higher Brinkman numbers, the proposed nonisothermal method produces a design with more desirable velocity uniformity level along with a maximum improvement of 5.24% over the isothermal method. In addition, dependency of flow field on temperature, due to temperature-dependent viscosity, is studied, and it is demonstrated that fullydeveloped velocity profile changes as temperature increases along the flow channel. Moreover, the effect of the temperature sensitivity parameter in temperature-dependent non-Newtonian models is considered. It is demonstrated that the temperature boundary condition with the Biot number of 1.0 gives adequate results for lower values of the temperature sensitivity parameter.en_US
dc.identifier.citationRazeghiyadaki, A., Wei, D., Perveen, A., Zhang, D., & Wang, Y. (2022). Effects of Melt Temperature and Non-Isothermal Flow in Design of Coat Hanger Dies Based on Flow Network of Non-Newtonian Fluids. Polymers, 14(15), 3161. https://doi.org/10.3390/polym14153161en_US
dc.identifier.urihttp://nur.nu.edu.kz/handle/123456789/7287
dc.language.isoenen_US
dc.publisherPolymersen_US
dc.rightsAttribution-NonCommercial-ShareAlike 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/us/*
dc.subjectType of access: Open Accessen_US
dc.subjectpolymer processingen_US
dc.subjectsheet die designen_US
dc.subjectcoat-hanger dieen_US
dc.subjectnon-isothermal non-Newtonian fluidsen_US
dc.subjectconstant shear-rate dieen_US
dc.subjectviscous dissipationen_US
dc.subjecttemperature effectsen_US
dc.titleEFFECTS OF MELT TEMPERATURE AND NON-ISOTHERMAL FLOW IN DESIGN OF COAT HANGER DIES BASED ON FLOW NETWORK OF NON-NEWTONIAN FLUIDSen_US
dc.typeArticleen_US
workflow.import.sourcescience

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