Wall slip in the capillary flow of molten polymers subject to viscous heating

Rosenbaum, Eugene E.; Hatzikiriakos, Savvas G.

doi:10.1002/aic.690430305

Cited by 85 publications

(58 citation statements)

References 23 publications

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“…This slip mechanics has been attributed to unravelling of the bulk chains and the chains attached to the wall. In order to consider the slip effect, for simplicity, the local slip velocity is modeled neglecting dependence on pressure and temperature by the following expression [19] …”

Section: Local Wall Slip Velocity Modelmentioning

confidence: 99%

Multi-scale filling simulation of micro-injection molding process

Choi

Kim

2011

J Mech Sci Technol

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This work proposes a multi-scale simulation method that can simulate filling during the micro-injection molding process. The multiscale simulation is comprised of two steps. In the first step, the macro-scale flow is analyzed using the conventional method. In the second step, the micro-scale simulation is conducted taking the slip and surface tension into consideration to investigate the filling of microcavity. Moreover, a conservative level set method is employed to accurately track the flow front. First, numerical tests have been done for circular micro-channels. The results show that slip and surface tension play important roles in the micro-regime. Second, to verify the multi-scale method, filling of a thin plate with micro-channel patterns has been simulated. The results show that the proposed multi-scale method is promising for micro-injection molding simulations.

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Section: Local Wall Slip Velocity Modelmentioning

confidence: 99%

Multi-scale filling simulation of micro-injection molding process

Choi

Kim

2011

J Mech Sci Technol

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“…It was reported that the flow in the microscale was different from those in the macroscale [7,8]. Viscosity was found to increase as the channel size decreased below tens of micrometers.…”

Section: Microfilling Modelmentioning

confidence: 95%

Analysis of filling distance in cylindrical microfeatures for microinjection molding

Young

2007

Applied Mathematical Modelling

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In the injection molding of plastic components with cylindrical microfeatures, the ability for the polymer melt to flow into the microchannels is a crucial factor for successful molding. Penetration distance of the polymer melt into the microstructure depends on several factors as the melt flow rate and the cooling rate in the microfeatures, which depends on the materials and geometric dimensions. In this study, a simplified analytical model was constructed to estimate the filling distance into the cylindrical microchannels. The effects of the mold temperature, injection rate, heat transfer coefficient, and microchannel dimension on the filling distance were investigated. The filling distance decreases dramatically with respect to the decrease of the channel radius. In molding of plastic components with cylindrical microfeatures as those analyzed in this study, decrease of the part thickness could also increase the filling distance in the microfeatures.

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“…A linear relationship between the extrusion pressure and the L/D was observed. This shows that pressure and viscous heating have no significant effect on the viscosity of the sample, although these have opposite effects in a Bagley plot and can eliminate each other (Rosenbaum & Hatzikiriakos, 1997). Extrapolation of the straight lines to zero L/D results the end pressure, DP ends , and thus the true shear stress can be obtained from Eq.…”

Section: Capillary Extrusion and Flow Curvementioning

confidence: 96%