Numerical investigation of pressure drop within isothermal capillary rheometry for viscous and viscoelastic fluids
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Huan-Chang Tseng
Abstract
In capillary rheometry of a polymer melt, the total pressure drop consists of three primary components: shear viscosity, extensional viscosity, and normal stress differences. Traditionally, viscoelastic constitutive equations have been used to produce accurate predictions regarding the pressure drop. It is difficult to investigate the primary components in past experimental measurements and numerical computations. The useful improvement of the classic White-Metzner viscoelastic constitutive equation coupled with the weighted shear/extension viscosity is performed in isothermal capillary flow simulations. It is significant to analyze the extension-induced pressure drop for a short die and the shear-induced pressure drop for a long die, along with a small contribution of normal stress differences.
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Author contributions: The author has accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: None declared.
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Conflict of interest statement: The author declares no conflicts of interest regarding this article.
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Articles in the same Issue
- Frontmatter
- Research Articles
- Mechanical and dielectric properties of Cissus Quadrangularis fiber-reinforced epoxy/TiB2 hybrid composites
- Numerical investigation of pressure drop within isothermal capillary rheometry for viscous and viscoelastic fluids
- The effect of extensional viscosity on the core structure of fiber orientation for injection-molded fiber composites
- Numerical analysis of a new mound-shaped extensional mixing element designed based on a sine curve in single-screw extrusion
- Effects of polymeric microcapsules on self-healing composites reinforced with carbon fibers: a comparative study
- Vulcanization kinetics and mechanical properties of filled ethylene-vinyl acetate copolymer rubber composites
- Experimental analysis of localized hybridization by means of adding woven polyester strip
- Molecular design of soluble poly(amide-imide) with high char yield for flame retardant epoxy resin
- Investigation of erosion wear performance and mechanism of mold materials
Articles in the same Issue
- Frontmatter
- Research Articles
- Mechanical and dielectric properties of Cissus Quadrangularis fiber-reinforced epoxy/TiB2 hybrid composites
- Numerical investigation of pressure drop within isothermal capillary rheometry for viscous and viscoelastic fluids
- The effect of extensional viscosity on the core structure of fiber orientation for injection-molded fiber composites
- Numerical analysis of a new mound-shaped extensional mixing element designed based on a sine curve in single-screw extrusion
- Effects of polymeric microcapsules on self-healing composites reinforced with carbon fibers: a comparative study
- Vulcanization kinetics and mechanical properties of filled ethylene-vinyl acetate copolymer rubber composites
- Experimental analysis of localized hybridization by means of adding woven polyester strip
- Molecular design of soluble poly(amide-imide) with high char yield for flame retardant epoxy resin
- Investigation of erosion wear performance and mechanism of mold materials
