Investigation of the interface behavior of a viscous fluid under free surface shear flow using an eccentric transparent Couette cell
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Prashanth Thirunavukkarasu
,
Céline Cohen
,
Rudy Valette
und
Bruno Vergnes
Abstract
In the present work, a prototype was developed to observe the flow behavior of viscous fluids under free surface shear and determine an adhesion energy in this flow geometry. The geometry consists of an eccentric Couette cell (outer cylinder radius of 89.5 mm, inner cylinder radius of 43.75 mm and minimal gap of 3 mm) that can be used in two modes, where both cylinders can respectively rotate in the same or opposite directions. Cylinders are horizontal and short relatively to their diameters (30 mm long). Transparent windows allow in-situ flow observations. The design, development, and testing of the prototype with a model viscous fluid (silicone fluid with a 2.2 104 Pa.s Newtonian viscosity) are reported in this paper. The flow behavior of small fluid volumes (fill factor smaller than 15%) was investigated under co- and counter-rotating configurations to determine steady-state flow conditions. Stationary conditions were identified in the counter-rotating mode. The velocity conditions and resulting observations are studied and analysed. However, for the used silicone fluid, the bulk dissipative energy is much larger than the work of adhesive forces in the investigated regimes. The adhesion energy contribution could not be detected for this fluid.
Funding source: This study was carried out within the framework of the OSUM project, FUI AAP23
Award Identifier / Grant number: BPiFrance
Funding source: Thirunavukkarasu’s PhD was funded by Michelin MFP and a CIFRE grant from the French agency Association Nationale de la Recherche et de la Technologie (A.N.R.T.)
Acknowledgements
The authors wish to thank Marc Bouyssou, Eric Brotons, Christelle Combeaud, Guillaume Corvec, Gilbert Fiorucci for their involvement in the manufacturing of the different components of the machine. Special thanks are addressed to Bruno Dratz and Pascal Tremblay from the Michelin company for their initiative, involvement, and discussions during the work.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: This study was carried out within the framework of the OSUM project, FUI AAP23, funded by BPiFrance. Thirunavukkarasu’s PhD was funded by Michelin MFP and a CIFRE grant from the French agency Association Nationale de la Recherche et de la Technologie (A.N.R.T.).
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
Some limitations were identified while working with the prototype:
With the present configuration of motors, 5.104 Pa.s appears to be an upper limit of the fluid viscosity that can be sheared in the thin gap region without breakage risks for glass windows.
Despite routine cleaning, tiny fluid volumes tend to get trapped at the interfaces between the mobile and immobile parts (e.g. between the rear window and the central immobile part) or between mobile parts (e.g. between the windows and the inner cylinder sides, see Figure 10B). The presence of these impurities leads, under shear, to the loss of transparency of the fluid over time (illustrated in Figure 10). It was verified that this loss of transparency due to impurities did not influence the rheological behavior of the fluid.
The fluid volume varies slightly over time during shear with the continuous entrapment and release of the fluid trapped in the different tiny gaps of the flow geometry.
Illustration of the loss of transparency of the fluid over time during shear flow: A) at the beginning, B) after a few minutes.
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© 2022 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Research Articles
- In-situ leakage behavior of polymer-metal hybrids under mechanical load
- Multi-objective optimization of injection molding process parameters based on BO-RFR and NSGAⅡ methods
- Effect of processing conditions on the rheological and mechanical properties of composites based on a PBS matrix and enzymatically treated date palm fibers
- Effect of additives on degradation of poly vinyl alcohol (PVA) using ultrasound and microwave irradiation
- Visualization analysis of temperature distribution in the cavity of conventional PPS and high-thermal-conductivity PPS during the filling stage of injection molding
- Conveyor belt modelling in extrusion flow simulation
- Analysis and optimization of FFF process parameters to enhance the mechanical properties of 3D printed PLA products
- Investigation of the interface behavior of a viscous fluid under free surface shear flow using an eccentric transparent Couette cell
- Effect of stacking sequence on mechanical, water absorption, and biodegradable properties of novel hybrid composites for structural applications
- Comparison of fibre reorientation of short-and long-fibre reinforced polypropylene by injection molding with a rotating mold core
- The impact of accelerated aging on the mechanical and thermal properties and VOC emission of polypropylene composites reinforced with glass fibers
- Three-dimensional simulation of vortex growth within entry flow of a polymer melt
Artikel in diesem Heft
- Frontmatter
- Research Articles
- In-situ leakage behavior of polymer-metal hybrids under mechanical load
- Multi-objective optimization of injection molding process parameters based on BO-RFR and NSGAⅡ methods
- Effect of processing conditions on the rheological and mechanical properties of composites based on a PBS matrix and enzymatically treated date palm fibers
- Effect of additives on degradation of poly vinyl alcohol (PVA) using ultrasound and microwave irradiation
- Visualization analysis of temperature distribution in the cavity of conventional PPS and high-thermal-conductivity PPS during the filling stage of injection molding
- Conveyor belt modelling in extrusion flow simulation
- Analysis and optimization of FFF process parameters to enhance the mechanical properties of 3D printed PLA products
- Investigation of the interface behavior of a viscous fluid under free surface shear flow using an eccentric transparent Couette cell
- Effect of stacking sequence on mechanical, water absorption, and biodegradable properties of novel hybrid composites for structural applications
- Comparison of fibre reorientation of short-and long-fibre reinforced polypropylene by injection molding with a rotating mold core
- The impact of accelerated aging on the mechanical and thermal properties and VOC emission of polypropylene composites reinforced with glass fibers
- Three-dimensional simulation of vortex growth within entry flow of a polymer melt
