Oscillatory squeeze flow for the study of linear viscoelastic behavior

Wingstrand, Sara Lindeblad; Alvarez, Nicolas J.; Hassager, Ole; Dealy, John M.

doi:10.1122/1.4943984

Cited by 14 publications

(8 citation statements)

References 39 publications

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“…Similar to PSR-1, |AR| n is obtained directly via the response of the piezoelements. First-order correction factors for inertia, slip coefficients, and compressibility have been derived (Hébraud et al 2000;Wingstrand et al 2016;Laun et al 1999;Kirschenmann 2003;Meeten 2004). Surface tension effects are difficult to correct for a priori and were specifically investigated by Cheneler et al (2011).…”

Section: Piezo Compressional Rheometers (Psr-2)mentioning

confidence: 99%

Bulk rheometry at high frequencies: a review of experimental approaches

et al. 2019

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High-frequency rheology is a form of mechanical spectroscopy which provides access to fast dynamics in soft materials and hence can give valuable information about the local scale microstructure. It is particularly useful for systems where timetemperature superposition cannot be used, when there is a need to extend the frequency range beyond what is possible with conventional rotational devices. This review gives an overview of different approaches to high-frequency bulk rheometry, i.e. mechanical rheometers that can operate at acoustic (20 Hz-20 kHz) or ultrasound (> 20 kHz) frequencies. As with all rheometers, precise control and know-how of the kinematic conditions are of prime importance. The inherent effects of shear wave propagation that occur in oscillatory measurements will hence be addressed first, identifying the gap and surface loading limits. Different high-frequency techniques are then classified based on their mode of operation. They are reviewed critically, contrasting ease of operation with the dynamic frequency range obtained. A comparative overview of the different types of techniques in terms of their operating window aims to provide a practical guide for selecting the right approach for a given problem. The review ends with a more forward looking discussion of selected material classes for which the use of high-frequency rheometry has proven particularly valuable or holds promise for bringing physical insights.

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Section: Piezo Compressional Rheometers (Psr-2)mentioning

confidence: 99%

Bulk rheometry at high frequencies: a review of experimental approaches

et al. 2019

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“…What's more, the complex viscosities of LGF/TPU/PBT/PTW composites with the addition of compatibilizer were higher than that of the LGF/TPU/PBT/PTW composites without the addition of compatibilizer at low frequency. These are typical characters of the composites .…”

Section: Resultsmentioning

confidence: 91%

“…Besides zero‐shear viscosity, the storage modulus and the loss angle are even more sensitive to the LGF/TPU/PBT/PTW composites . The internal structural changes in composite systems under shear flow can be analyzed using frequency dependences of the storage ( G ′) and loss ( G ″) moduli, that is, G ′ ∞ ω 2 and G ″ ∞ ω .…”

Section: Resultsmentioning

confidence: 99%

Influences of poly(ethylene‐butylacrylate‐glycidyl methacrylate copolymer) on rheology characterization, morphology, dynamic mechanical, thermal, and mechanical properties of long glass fibers reinforced poly(butylene terephthalate) composites

Zhang

Qin

et al. 2016

Polymer Composites

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Long glass fibers (GF) reinforced thermoplastic polyurethane and poly(butylene terephthalate) with the different poly(ethylene‐butylacrylate‐glycidyl methacrylate copolymer) (PTW) compatibilizer content (LGF/TPU/PBT/PTW) composites were prepared by using self‐designed impregnation device. Effect of the different PTW compatibilizer content on rheological properties (for example, viscosity curve, storage modulus, loss modulus, loss angle, and relaxation spectrum) of LGF/TPU/PBT/PTW composites are studied. dynamic mechanical properties analysis results indicated that the compatibility of the LGF/TPU/PBT/PTW composites firstly increase and then decrease with increasing the PTW content. Effect of the different PTW content on thermal properties of LGF/TPU/PBT/PTW composites are studied by differential scanning calorimetry and thermogravimetric analyses. Morphological observation by scanning electron microscopy revealed a thin layer of matrix resins adhering to the surface of GF indicating that epoxy functional group in the PTW reacts with GF surface and PBT matrix. Moreover, mechanical properties of LGF/TPU/PBT/PTW composites with the different PTW content are studied. POLYM. COMPOS., 39:E1354–E1363, 2018. © 2016 Society of Plastics Engineers

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“…This basic scheme is has been broadly applied to laboratory measurements and is also implemented in the OLR here for online measurements of mine tailing. Validation studies (Konigsberg et al, 2013) as well as application to various types of liquids are available in literature (Konigsberg et al, 2014;Wingstrand et al, 2016;Phan-Thien et al, 2000).…”

Section: Measurement Details and Field Work 21 Brief Outline Of Oscimentioning

confidence: 99%

Assessment of on-line rheology as a control tool for thickened tails

Kealy¹,

Bhattacharjee²,

Griffin³

2017

Proceedings of the 20th International Seminar on Paste and Thickened Tailings

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The intention of this work was to assess the suitability of the online rheometer (OLR) as a process control tool for measuring coal paste, fed direct from thickener through an OLR. The aim being to predict the OLR performance on-site for process control measuring complex viscosity, G' elastic modulus (the 'solid-like' component of the paste), G" viscous modulus (the 'liquid-like' contribution to flow of the paste) controlled by the local operator. On-site testing was conducted to measure the paste density (kg/m 3 ), and compare with Viscoelastic behaviour of the samples. The instrument and sensors used for the analyses were the Rheology Solutions OLR with a serrated plate and plate sensor to minimise slip. The OLR was installed close to the discharge of the thickener, on a rubber mat to damp vibrations from the plant. Thickener discharged thickened paste, which flowed directly through the OLR from the thickener through a 1" diameter flexible hose. OLR data was compared with incumbent process control technology -on-line density measurement. The results indicate that the complex viscosity measured at low frequency correlates well with the in-line density measurement, whereas the other material functions measured by the OLR can be useful for process control. An example of a possible process control strategy is discussed.

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Oscillatory squeeze flow for the study of linear viscoelastic behavior

Cited by 14 publications

References 39 publications

Bulk rheometry at high frequencies: a review of experimental approaches

Bulk rheometry at high frequencies: a review of experimental approaches

Influences of poly(ethylene‐butylacrylate‐glycidyl methacrylate copolymer) on rheology characterization, morphology, dynamic mechanical, thermal, and mechanical properties of long glass fibers reinforced poly(butylene terephthalate) composites

Assessment of on-line rheology as a control tool for thickened tails

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