On the wall slip phenomenon of elastomers in oscillatory shear measurements using parallel-plate rotational rheometry: I. Detecting wall slip

2017 ◽  
Vol 61 ◽  
pp. 430-440 ◽  
Author(s):  
Bastian L. Walter ◽  
Jean-Paul Pelteret ◽  
Joachim Kaschta ◽  
Dirk W. Schubert ◽  
Paul Steinmann
Keyword(s):  
Parallel Plate ◽  
Wall Slip ◽  
Oscillatory Shear ◽  
Slip Phenomenon

On the wall slip phenomenon of elastomers in oscillatory shear measurements using parallel-plate rotational rheometry: II. Influence of experimental conditions

2017 ◽  
Vol 61 ◽  
pp. 455-463 ◽  
Author(s):  
Bastian L. Walter ◽  
Jean-Paul Pelteret ◽  
Joachim Kaschta ◽  
Dirk W. Schubert ◽  
Paul Steinmann
Keyword(s):  
Parallel Plate ◽  
Wall Slip ◽  
Oscillatory Shear ◽  
Experimental Conditions ◽  
Slip Phenomenon

Influence of the Key Factors on the Wall Slip Phenomenon in Micro Flow

2012 ◽  
Vol 472-475 ◽  
pp. 2415-2421
Author(s):  
Pei Qian He ◽  
Yan Lou ◽  
Xiao Yu Wu
Keyword(s):  
Shear Stress ◽  
Flow Analysis ◽  
Wall Slip ◽  
Slip Boundary Condition ◽  
Key Factors ◽  
Slip Coefficient ◽  
Slip Boundary ◽  
Navier’S Slip ◽  
Micro Flow ◽  
Slip Phenomenon

Aimed at the wall slip phenomenon of micro flow, the wall slip boundary condition was added to simulate the process of the micro flow by Polyflow based on the traditional flow analysis method. The effect of the wall slip on the micro flow was verified by comparing the pressure difference data obtained from the simulation with the quoted test data. In addition, based on the Generalized Navier’s slip law, the shear stress and slip coefficient were researched by the numerical simulation analyses to find out the influence of the key factors on the phenomenon of wall slip. The results show that the phenomenon of wall slip is an important factor that cannot be ignored in the micro flow. And only under the high shear stress, the wall slip phenomenon will have an obvious influence on the micro flow. Along with the decrease of the slip coefficient, the wall slip phenomenon becomes more apparent and the micro flow tends to be stable.

Rheo-PIV analysis of the steady torsional parallel-plate flow of a viscoplastic microgel with wall slip

2022 ◽  
Vol 66 (1) ◽  
pp. 31-48
Author(s):  
Esteban F. Medina-Bañuelos ◽  
Benjamín M. Marín-Santibáñez ◽  
José Pérez-González
Keyword(s):  
Parallel Plate ◽  
Wall Slip ◽  
Piv Analysis

Wall Slip during the Flow of Carbopol Solutions through a Parallel Plate Channel

2008 ◽  
Author(s):  
Paulo R. de Souza Mendes ◽  
Jonathan Pédron ◽  
Renata A. B. Pereira ◽  
Albert Co ◽  
Gary L. Leal ◽  
...  
Keyword(s):  
Parallel Plate ◽  
Wall Slip ◽  
Plate Channel

Rheological Behavior and Cell Morphology of Foamed Waste Paper Pulp/ High Density Polyethylene Composites

2012 ◽  
Vol 200 ◽  
pp. 316-320
Author(s):  
Guang Sheng Zeng ◽  
Chao Xu ◽  
Yue Jun Liu ◽  
Jin Ping Qu
Keyword(s):  
Shear Rate ◽  
High Density Polyethylene ◽  
Wall Slip ◽  
High Density ◽  
Waste Paper ◽  
Paper Pulp ◽  
Blowing Agent ◽  
Corrugated Paper ◽  
Slip Phenomenon ◽  
Scanning Electron

The waste corrugated paper was grinded to paper pulp first, and then the paper pulp was used to prepare the foamed waste paper pulp/high density polyethylene（HDPE）composites by compression molding with HDPE. The Rosand double-barrel capillary rhepmeter was used to research the influences of the blowing agent AC(Azodicarbonamide) content，waste paper pulp content，temperature and different blowing agent on the melt of the composites. Scanning electron microscopy（SEM）was also used to observe the effects of different contents of AC and waste paper pulp on the cell morphologies.The results showed that: when the shear rate up to 600 S-1，the melt performs of the foamed waste paper pulp/ HDPE composites were pseudoplastic flow, and turn up wall slip phenomenon. The viscosity of melt was significantly reduced with the content of AC increased, but it increased with the content of the waste paper pulp increased. When the shear rate reduced to 275 S-1 or below, the viscosity of melt reduced as the temperature riased; while when the shear rate went up to 275 S-1 or high, the viscosity of melt increased as the temperature riased. When the shear rate reduced to 325 S-1 or below, the melt of endothermic blowing agent （NaHCO3）showed the highest viscosity; when the shear rate went up to 325 S-1 or high, the melt of exothermic blowing agent AC shows the highest viscosity. The number of cell increased and size of cell became smaller with the AC content increased , but the number of cell reduced and the size of cell became larger with the content of waste paper pulp increased observing by SEM.

A Novel Method to Choose the Experimental Parameters in Large Amplitude Oscillatory Shear Rheology

2022 ◽  
Vol 1048 ◽  
pp. 54-64
Author(s):  
Jagadeeshwar Kodavaty ◽  
R.K. Pavan Kumar Pannala ◽  
Sakshi Wasson ◽  
Mihir Mittal ◽  
Atif Irshad
Keyword(s):  
Hyaluronic Acid ◽  
Vinyl Alcohol ◽  
Large Amplitude ◽  
Parallel Plate ◽  
Oscillatory Shear ◽  
Shannon’S Entropy ◽  
Poly Vinyl Alcohol ◽  
Model Parameters ◽  
Large Amplitude Oscillatory Shear ◽  
Shannon's Entropy

Large Amplitude Oscillatory Shear (LAOS) rheology is a technique to analyze materials that are viscoelastic in nature. The raw values of stress and strain that were taken out from rheometer during the large amplitude oscillatory shear test are used in the constitutive models. The model parameters from the constitutive model are then analyzed on the materials being tested. Various test protocols and geometries will be used to analyze the materials of interest during LAOS rheological examination. The selection of test protocols and usage of geometry are less studied in testing various kinds of materials using LAOS. Cone and plate and parallel plate geometries are generally used for LAOS. The test protocols would be varying amplitude and varying frequencies. In the present work, quantification of relative performance of test protocols and geometry that have been used during the analysis of cross-linked poly vinyl alcohol hyaluronic acid (PVAHA) gels as material systems are studied using data envelopment analysis (DEA). The methodological approach using output oriented constant return to scale (CRS) and output oriented variable return to scale (VRS) are tested with the decision making units (DMU) as the geometry and test protocols used. These results are then combined with the Shannon's entropy to rank the efficient DMUs. Using Shannon's entropy combined with CRS and VRS, it is suggested that the use of parallel plate geometry with the test protocol of 0.5 rad/s and 50 frequency is best suitable for the cross-linked hyaluronic acid and poly vinyl alcohol gels examined.

ANFIS-based model for predicting actual shear rate associated with wall slip phenomenon

2019 ◽  
Vol 24 (13) ◽  
pp. 9639-9649 ◽  
Author(s):  
Ren Jie Chin ◽  
Sai Hin Lai ◽  
Shaliza Ibrahim ◽  
Wan Zurina Wan Jaafar ◽  
Ahmed Elshafie
Keyword(s):  
Shear Rate ◽  
Wall Slip ◽  
Slip Phenomenon
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