Experimental Study on Air Entrainment in Slot Die Coating of High-Viscosity, Shear-Thinning Fluids

2012 ◽  
Vol 80 ◽  
pp. 195-204 ◽  
Author(s):  
Kanthi Bhamidipati ◽  
Sima Didari ◽  
Tequila A.L. Harris
Keyword(s):  
Experimental Study ◽  
Air Entrainment ◽  
Shear Thinning ◽  
High Viscosity ◽  
Slot Die Coating ◽  
Shear Thinning Fluids ◽  
Slot Die

Simulation and Analysis of Fluid Dynamic Behaviour of Foods during Filling Processes

2007 ◽  
Vol 2 (3) ◽  
Author(s):  
Eleonora Bottani ◽  
Roberto Rizzo ◽  
Giuseppe Vignali
Keyword(s):  
Dynamic Behaviour ◽  
Fluid Dynamic ◽  
Shear Thinning ◽  
High Viscosity ◽  
Inlet Section ◽  
Shear Thinning Fluids ◽  
Filling System ◽  
Time Required ◽  
Shear Thinning Fluid ◽  
Steady State Predictions

This research presents a model describing the behaviour of a non-Newtonian shear-thinning fluid during aseptic filling processes, in order to determine the influence of the behaviour of fluids on the performance of filling valves in aseptic beverage plants, mainly in terms of the time required to perform the filling process. The ultimate aim of the study is to explore the possibility of improving the accuracy of industrial filling processes, so as to be able to utilise them with high viscosity fluids.The numerical model, exploiting the Finite Elements Method (FEM), was designed using the commercial software Comsol Multiphysics, and validated by comparing the steady state predictions with outcomes of filling experiments performed in industrial laboratories. Hence, subsequent numerical simulations were performed to investigate the transition from laminar to turbulent flow for shear-thinning fluids under different pressure conditions, in 3D time-dependent configurations. Results of the simulations, performed on a low fat yoghurt, show that laminar flow subsists within the whole filling system when the Metzner-Reed Reynolds number at the inlet section of the valve is lower than approx 444.

Experimental study of the immiscible displacement of shear-thinning fluids in pore networks

2003 ◽  
Vol 267 (1) ◽  
pp. 217-232 ◽  
Author(s):  
C.D Tsakiroglou ◽  
M Theodoropoulou ◽  
V Karoutsos ◽  
D Papanicolaou ◽  
V Sygouni
Keyword(s):  
Experimental Study ◽  
Shear Thinning ◽  
Immiscible Displacement ◽  
Pore Networks ◽  
Shear Thinning Fluids

scholarly journals Experimental study of low inertia vortex rings in shear-thinning fluids

2018 ◽  
Vol 30 (11) ◽  
pp. 113103 ◽  
Author(s):  
O. Bentata ◽  
D. Anne-Archard ◽  
P. Brancher
Keyword(s):  
Experimental Study ◽  
Shear Thinning ◽  
Vortex Rings ◽  
Shear Thinning Fluids

Experimental study of particle electrophoresis in shear-thinning fluids

2019 ◽  
Vol 31 (2) ◽  
pp. 022002 ◽  
Author(s):  
Amirreza Malekanfard ◽  
Logan Bulloch ◽  
Alicia Baldwin
Keyword(s):  
Experimental Study ◽  
Shear Thinning ◽  
Shear Thinning Fluids

An experimental study on the reproducibility of different multilayer OLED materials processed by slot die coating

2017 ◽  
Vol 160 ◽  
pp. 113-120 ◽  
Author(s):  
S.M. Raupp ◽  
L. Merklein ◽  
M. Pathak ◽  
P. Scharfer ◽  
W. Schabel
Keyword(s):  
Experimental Study ◽  
Slot Die Coating ◽  
Slot Die

scholarly journals GALERKIN LEAST-SQUARES APPROXIMATIONS FOR FLOWS OF CASSON FLUIDS THROUGH AN EXPANSION

2006 ◽  
Vol 5 (2) ◽  
pp. 82
Author(s):  
F. S. F. Zinani ◽  
S. Frey
Keyword(s):  
Least Squares ◽  
Continuum Mechanics ◽  
Complex Geometry ◽  
Shear Thinning ◽  
High Viscosity ◽  
Industrial Applications ◽  
Material Behavior ◽  
Sudden Expansion ◽  
Shear Thinning Fluids ◽  
Viscosity Function

Among non-Newtonian fluid models, purely viscous constitutive equations play an important role in industrial applications regardless their lack of accuracy in non-viscometric flows. In this work we are concerned with the flow of viscoplastic shear-thinning fluids in complex geometry. Viscoplastic fluids are those that behave as extremely high viscosity materials when submitted to low stresses and that flow when submitted to stresses higher than a yield stress value. Usually, they also present shearthinning behavior. Fluids such as molten chocolate, xanthan gum solutions, blood, wastewater sludges, muds, and polymer solutions present viscoplastic shear-thinning features. In order to approximate numerically viscoplastic shear-thinning flows we first describe a mechanical model based on continuum mechanics conservation laws of mass and momentum. The description of material behavior is such as to respect certain principles of objectivity and generality in continuum mechanics. The Generalized Newtonian Liquid constitutive equation with Casson viscosity function is able to predict viscoplasticity and shear-thinning. The numerical approximation of the equations is performed by a finite element method. To prevent the model from pathologies known for the classic Galerkin method, we employ a stabilized method based on a Galerkin least-squares (GLS) scheme, which is designed to circumvent Babuška-Brezzi condition and deal with the asymmetry of the advective operator. We present approximations for the flow through a planar 4:1 sudden expansion. We investigate the influence of Reynolds and Casson numbers on the flow dynamics.

scholarly journals Investigation of edge formation during the coating process of Li-ion battery electrodes

2021 ◽  
Author(s):  
Sandro Spiegel ◽  
Thilo Heckmann ◽  
Andreas Altvater ◽  
Ralf Diehm ◽  
Philip Scharfer ◽  
...  
Keyword(s):  
Large Scale ◽  
Shear Thinning ◽  
Flow Profile ◽  
Scale Production ◽  
Material System ◽  
Li Ion Battery ◽  
Slot Die Coating ◽  
Slot Die ◽  
Li Ion ◽  
The Impact

AbstractIn this manuscript, a method to reduce superelevations of lateral edges in cross-web direction during slot die coating of shear-thinning slurries for Li-ion battery electrodes (LIB) was developed. Therefore, the impact of the inner slot die geometry on the edge elevations was investigated. These elevations of the coating could be almost eliminated by optimizing the flow profile at the outlet of the slot die by modification of the internal geometry. This adaption is an essential step in optimizing the coating quality of slot die coating for battery electrodes to significantly reduce coating edges and, hence, the resulting production reject during the coating step of the industrial roll-to-roll process. It was also shown that lateral edges of the coating can be influenced explicitly by process parameters such as volume flow and gap between slot die and substrate. This correlation has already been shown for other shear-thinning material systems in previous works, which is now confirmed for this material system. At the beginning, the influence of different internal geometries on the formation of the edge elevations was shown. Finally, for the shear-thinning electrode slurry used in this work, optimal dimensions of the previously determined inner geometry for the slot die outlet were found. The optimization was performed for a state-of-the-art electrode area capacity (approximately 2.2 mAh cm−2). The results enable a significant reduction of defects and reject in the coating step of large-scale production of LIB electrodes in the future, adding to a more sustainable battery production.

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