Fluid flow between rotating cylinders

Takserman-Krozer, R.; Schenkel, G.; Ehrmann, G

doi:10.1007/bf01515902

Cited by 17 publications

(3 citation statements)

References 4 publications

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“…The introduction of a mean effective viscosity (Torner and Dobroljubov, 1958) or of bipolar coordinates (Ehrlich and Slattery, 1968;Takserman-Krozer et al, 1975) extends somewhat the range of the analytical solutions. McKelvey (1962), Pearson ( 1966), and Torner ( 1972) discussed partial solutions for power law fluids.…”

Section: Conclusion and Significancementioning

confidence: 99%

Nonisothermal nip flow in calendering operations

Dobbels¹,

Mewis²

1977

AIChE Journal

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An efficient and simple numerical technique is presented for analyzing nonisothermal nip flow of viscous liquids. It has been applied on calendering to calculate the design parameters as well as the interaction effects between roller characteristics, operation conditions, and material properties. Viscous heating is shown to drastically change the mechanics near the nip exit if the rollers rotate at different speeds. Consequences for scaling‐up and model experiments are indicated.

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Section: Conclusion and Significancementioning

confidence: 99%

Nonisothermal nip flow in calendering operations

Dobbels¹,

Mewis²

1977

AIChE Journal

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“…The calendering process was studied in a bipolarcoordinate system in the Newtonian case by Taskerman-Krozer et al (9), in the pseudoplastic case by Ehrmann et al (10) and with a pseudoplastic model depending on temperature by Finston (1 1) and Bekin et al (12). This permitted them to compute directly the symmetrical flow of the molten polymer without the lubrication approximation.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental study of the molten polymer flow in the calender bank

Agassant

Espy

1985

Polymer Engineering & Sci

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The flow of molten polymers in the calender bank has been computed using a finite‐element method with stream function and vorticity. Two nonsymmetrical‐recirculating regions have been obtained fully in agreement with the experimental observations on poly(vinyl chloride) melt banks. The pressure distribution along the flow axis is very close to the one obtained using the classical‐lubrication approximation.

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“…the calculated profiles for the principal stress difference are shown. The stress differences can be calculated numerically by @I -(+[I) = d(%* -7yJ2 + %y2 = 2r) J($ -+ ($ -g)2(22) Pressure field. 6~-01 polyisobutene melt (Oppanol 83) h,= 5 mm, rl = r 2 = 75 mm, w = w = 1.395 l Principal stress difference field.…”

mentioning

confidence: 99%

Comparison of calculated with measured flow fields in the gap between two rotating rolls

1994

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Velocity, pressure, temperature, and stress fields are calculated for the flow of a polymer between two counterdirectionally rotating rolls. The rheological behavior of the polymer is described by the Carreau equation, while elasticity is neglected. The results of the numerical calculations are compared with measurements. The stress field is measured by the birefringence method. The local principal stresses in the fluid are determined from the measured anisotropy of the sheared fluid for the penetrating monochromatic light by means of the stress optical law. The equations of motion and continuity are solved with a Finite Element Method (FEM) based on the Galerkin weighted residual method. The computer code is combined with a Boundary Element Method (BEM) algorithm using the Dual Reciprocity Method (DRM) to solve the coupled equation of energy. Results are shown for a shear-thinning polyisobutene melt in a calender with totally submerged rolls. The calculated results for the principal stress differences are compared to the measured results and confirm fairly well. The influence of friction is discussed. 0 1994

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Fluid flow between rotating cylinders

Cited by 17 publications

References 4 publications

Nonisothermal nip flow in calendering operations

Nonisothermal nip flow in calendering operations

Theoretical and experimental study of the molten polymer flow in the calender bank

Comparison of calculated with measured flow fields in the gap between two rotating rolls

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