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OWCh: Optimally Windowed Chirp rheometry using combined motor transducer/single head rheometers

Rebecca E. Hudson-Kershaw, Mohua Das Orcid Logo, Gareth McKinley, Daniel Curtis Orcid Logo

Journal of Non-Newtonian Fluid Mechanics, Start page: 105307

Swansea University Authors: Gareth McKinley, Daniel Curtis Orcid Logo

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DOI (Published version): 10.1016/j.jnnfm.2024.105307

Abstract

Recent advances in rheometry exploiting frequency-modulated (chirp) waveforms have dramatically reduced the time required to perform linear viscoelastic characterisation of complex materials. However, the technique was optimised for ‘separate motor transducer’ instruments, in which the drive motor i...

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Published in: Journal of Non-Newtonian Fluid Mechanics
ISSN: 0377-0257 1873-2631
Published: Elsevier BV 2024
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URI: https://cronfa.swan.ac.uk/Record/cronfa67483
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spelling v2 67483 2024-08-28 OWCh: Optimally Windowed Chirp rheometry using combined motor transducer/single head rheometers dad287fa472aa07dd83ad1c6eaeb937d Gareth McKinley Gareth McKinley true false e76ff28a23af2fe37099c4e9a24c1e58 0000-0002-6955-0524 Daniel Curtis Daniel Curtis true false 2024-08-28 Recent advances in rheometry exploiting frequency-modulated (chirp) waveforms have dramatically reduced the time required to perform linear viscoelastic characterisation of complex materials. However, the technique was optimised for ‘separate motor transducer’ instruments, in which the drive motor imposing the strain deformation is decoupled from the torque transducer. Whilst the use of optimised windowed chirps (OWCh) using other rheometers has been recently reported in the literature, no systematic study concerning the use of ‘combined motor transducer’ instruments (in which the motor and transducer subsystems are integrated into a single ‘head’) has been undertaken. In the present study, we demonstrate the use of OWCh rheometry using combined motor transducer/single-head rheometers using a stress-controlled operating principle, thus avoiding the reliance on complicated and instrument-specific feedback control systems that would be required to perform strain-controlled experiments. The use of stress-controlled chirps requires a modification to the established OWCh analysis protocol such that the complex viscosity is used as an intermediate proxy function for ultimately computing the complex modulus . This approach negates the effect of the strain offset that is inherent to stress-controlled oscillatory rheometry. Secondly, a correction algorithm and operational criteria for identifying inertial artefacts is established before we consider the impact of chirp digitisation on data acquisition. The use of stress-controlled OWCh rheometry (which we term Stress-OWCh, i.e. OWCh) is demonstrated for a diverse range of material classes including, Newtonian calibration fluids (silicone oil), polymer solutions (polyethylene oxide in water), an entangled polymer melt (polydimethylsiloxane), worm-like micellar systems (cetylpyridinium chloride/sodium salicylate), time-evolving critical gels (gelatin) and aging elastoviscoplastic materials (Laponite®). This novel implementation of chirp waveforms using a single-head rheometer will facilitate the wider adoption of OWCh rheometry and allow the benefits of frequency-modulation techniques to be exploited where separate motor transducer instruments are unavailable/unsuitable. Journal Article Journal of Non-Newtonian Fluid Mechanics 0 105307 Elsevier BV 0377-0257 1873-2631 Optimally Windowed Chirp rheometry, linear viscoelasticity, rheometry, experimental techniques 30 8 2024 2024-08-30 10.1016/j.jnnfm.2024.105307 COLLEGE NANME COLLEGE CODE Swansea University SU Library paid the OA fee (TA Institutional Deal) The authors acknowledge funding from the Engineering and Physical Sciences Research Council, UK through grants EP/N013506/1 (DJC) & EP/T026154/1 (DJC, REH) and the Welsh Government (DJC) via SmartExpertise and Capital Equipment programmes. 2024-09-19T14:43:35.5288904 2024-08-28T15:23:46.6454222 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Rebecca E. Hudson-Kershaw 1 Mohua Das 0009-0008-8080-8531 2 Gareth McKinley 3 Daniel Curtis 0000-0002-6955-0524 4
title OWCh: Optimally Windowed Chirp rheometry using combined motor transducer/single head rheometers
spellingShingle OWCh: Optimally Windowed Chirp rheometry using combined motor transducer/single head rheometers
Gareth McKinley
Daniel Curtis
title_short OWCh: Optimally Windowed Chirp rheometry using combined motor transducer/single head rheometers
title_full OWCh: Optimally Windowed Chirp rheometry using combined motor transducer/single head rheometers
title_fullStr OWCh: Optimally Windowed Chirp rheometry using combined motor transducer/single head rheometers
title_full_unstemmed OWCh: Optimally Windowed Chirp rheometry using combined motor transducer/single head rheometers
title_sort OWCh: Optimally Windowed Chirp rheometry using combined motor transducer/single head rheometers
author_id_str_mv dad287fa472aa07dd83ad1c6eaeb937d
e76ff28a23af2fe37099c4e9a24c1e58
author_id_fullname_str_mv dad287fa472aa07dd83ad1c6eaeb937d_***_Gareth McKinley
e76ff28a23af2fe37099c4e9a24c1e58_***_Daniel Curtis
author Gareth McKinley
Daniel Curtis
author2 Rebecca E. Hudson-Kershaw
Mohua Das
Gareth McKinley
Daniel Curtis
format Journal article
container_title Journal of Non-Newtonian Fluid Mechanics
container_volume 0
container_start_page 105307
publishDate 2024
institution Swansea University
issn 0377-0257
1873-2631
doi_str_mv 10.1016/j.jnnfm.2024.105307
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
document_store_str 0
active_str 0
description Recent advances in rheometry exploiting frequency-modulated (chirp) waveforms have dramatically reduced the time required to perform linear viscoelastic characterisation of complex materials. However, the technique was optimised for ‘separate motor transducer’ instruments, in which the drive motor imposing the strain deformation is decoupled from the torque transducer. Whilst the use of optimised windowed chirps (OWCh) using other rheometers has been recently reported in the literature, no systematic study concerning the use of ‘combined motor transducer’ instruments (in which the motor and transducer subsystems are integrated into a single ‘head’) has been undertaken. In the present study, we demonstrate the use of OWCh rheometry using combined motor transducer/single-head rheometers using a stress-controlled operating principle, thus avoiding the reliance on complicated and instrument-specific feedback control systems that would be required to perform strain-controlled experiments. The use of stress-controlled chirps requires a modification to the established OWCh analysis protocol such that the complex viscosity is used as an intermediate proxy function for ultimately computing the complex modulus . This approach negates the effect of the strain offset that is inherent to stress-controlled oscillatory rheometry. Secondly, a correction algorithm and operational criteria for identifying inertial artefacts is established before we consider the impact of chirp digitisation on data acquisition. The use of stress-controlled OWCh rheometry (which we term Stress-OWCh, i.e. OWCh) is demonstrated for a diverse range of material classes including, Newtonian calibration fluids (silicone oil), polymer solutions (polyethylene oxide in water), an entangled polymer melt (polydimethylsiloxane), worm-like micellar systems (cetylpyridinium chloride/sodium salicylate), time-evolving critical gels (gelatin) and aging elastoviscoplastic materials (Laponite®). This novel implementation of chirp waveforms using a single-head rheometer will facilitate the wider adoption of OWCh rheometry and allow the benefits of frequency-modulation techniques to be exploited where separate motor transducer instruments are unavailable/unsuitable.
published_date 2024-08-30T14:43:35Z
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score 11.028798

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