Experimental and simulative determination and correction of the effective gap extension in structured coaxial measuring systems

S. Josch, S. Jesinghausen, C. Dechert, H.-J. Schmid, Rheologica Acta (2023).

Journal Article | Published | English
Abstract
<jats:title>Abstract</jats:title><jats:p>The use of structured measuring systems to prevent wall slip is a common approach to obtain absolute rheological values. Typically, only the minimum distance between the measuring surfaces is used for further calculation, implying that no flow occurs between the structural elements. But this assumption is misleading, and a gap correction is necessary. To determine the radius correction <jats:inline-formula><jats:alternatives><jats:tex-math>$$\Delta r$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>Δ</mml:mi> <mml:mi>r</mml:mi> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> for specific geometries, we conducted investigations on three Newtonian fluids (two silicon oils and one suspension considered to be Newtonian in the relevant shear rate range). The results show that <jats:inline-formula><jats:alternatives><jats:tex-math>$$\Delta r$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>Δ</mml:mi> <mml:mi>r</mml:mi> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> is not only shear- and material-independent, but geometry-dependent, providing a Newtonian flow behaviour in a similar viscosity range. Therefore, a correction value can be determined with only minute deviations in different Newtonian fluids. As the conducted laboratory measurements are very time-consuming and expensive, a CFD-approach with only very small deviations was additionally developed and compared for validation purposes. Therefore, simulation is an effective and resource-efficient alternative to the presented laboratory measurements to determine <jats:inline-formula><jats:alternatives><jats:tex-math>$$\Delta r$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>Δ</mml:mi> <mml:mi>r</mml:mi> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> for the correction of structured coaxial geometries even for non-Newtonian fluids in the future.</jats:p>
Publishing Year
Journal Title
Rheologica Acta
LibreCat-ID

Cite this

Josch S, Jesinghausen S, Dechert C, Schmid H-J. Experimental and simulative determination and correction of the effective gap extension in structured coaxial measuring systems. Rheologica Acta. Published online 2023. doi:10.1007/s00397-023-01383-2
Josch, S., Jesinghausen, S., Dechert, C., & Schmid, H.-J. (2023). Experimental and simulative determination and correction of the effective gap extension in structured coaxial measuring systems. Rheologica Acta. https://doi.org/10.1007/s00397-023-01383-2
@article{Josch_Jesinghausen_Dechert_Schmid_2023, title={Experimental and simulative determination and correction of the effective gap extension in structured coaxial measuring systems}, DOI={10.1007/s00397-023-01383-2}, journal={Rheologica Acta}, publisher={Springer Science and Business Media LLC}, author={Josch, Sebastian and Jesinghausen, Steffen and Dechert, Christopher and Schmid, Hans-Joachim}, year={2023} }
Josch, Sebastian, Steffen Jesinghausen, Christopher Dechert, and Hans-Joachim Schmid. “Experimental and Simulative Determination and Correction of the Effective Gap Extension in Structured Coaxial Measuring Systems.” Rheologica Acta, 2023. https://doi.org/10.1007/s00397-023-01383-2.
S. Josch, S. Jesinghausen, C. Dechert, and H.-J. Schmid, “Experimental and simulative determination and correction of the effective gap extension in structured coaxial measuring systems,” Rheologica Acta, 2023, doi: 10.1007/s00397-023-01383-2.
Josch, Sebastian, et al. “Experimental and Simulative Determination and Correction of the Effective Gap Extension in Structured Coaxial Measuring Systems.” Rheologica Acta, Springer Science and Business Media LLC, 2023, doi:10.1007/s00397-023-01383-2.
All files available under the following license(s):
Copyright Statement:
This Item is protected by copyright and/or related rights. [...]

Link(s) to Main File(s)
Access Level
Restricted Closed Access

Export

Marked Publications

Open Data LibreCat

Search this title in

Google Scholar