Journal of Rheology最新文献_第2页

Thixotropy, antithixotropy, and viscoelasticity in hysteresis 触变性、反触变性和滞回中的粘弹性

2区工程技术

Journal of Rheology Pub Date : 2023-10-31 DOI: 10.1122/8.0000620

Yilin Wang, Randy H. Ewoldt

{"title":"Thixotropy, antithixotropy, and viscoelasticity in hysteresis","authors":"Yilin Wang, Randy H. Ewoldt","doi":"10.1122/8.0000620","DOIUrl":"https://doi.org/10.1122/8.0000620","url":null,"abstract":"Thixotropy, antithixotropy, and viscoelasticity are three types of time-dependent dynamics that involve fundamentally different underlying physical processes. Here, we show that the three dynamics exhibit different signatures in hysteresis by examining the fingerprints of the simplest thixotropic kinetic model, a new antithixotropic model that we introduce here, and the Giesekus model. We start by showing that a consistent protocol to generate hysteresis loops is a discrete shear-rate controlled ramp that begins and ends at high shear rates, rather than at low shear rates. Using this protocol, we identify two distinguishing features in the resulting stress versus shear rate loops. The first is the direction of the hysteresis loops: clockwise for thixotropy, but counterclockwise for viscoelasticity and antithixotropy. A second feature is achieved at high ramping rates where all responses lose hysteresis: the viscoelastic response shows a stress plateau at low shear rates due to lack of stress relaxation, whereas the thixotropic and antithixotropic responses are purely viscous with minimal shear thinning or thickening. We establish further evidence for these signatures by experimentally measuring the hysteresis of Laponite suspensions, carbon black suspensions, and poly(ethylene oxide) solutions, each representing a historically accepted example of each class of material behavior. The signatures measured in experiments are consistent with those predicted by the three models. This study reveals different fingerprints in hysteresis loops associated with thixotropy, antithixotropy, and viscoelasticity, which may be helpful in distinguishing the three time-dependent responses.","PeriodicalId":16991,"journal":{"name":"Journal of Rheology","volume":"23 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135870142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Universal scaling of shear thickening transitions 普遍缩放剪切增厚过渡

2区工程技术

Journal of Rheology Pub Date : 2023-10-05 DOI: 10.1122/8.0000697

Meera Ramaswamy, Itay Griniasty, Danilo B. Liarte, Abhishek Shetty, Eleni Katifori, Emanuela Del Gado, James P. Sethna, Bulbul Chakraborty, Itai Cohen

{"title":"Universal scaling of shear thickening transitions","authors":"Meera Ramaswamy, Itay Griniasty, Danilo B. Liarte, Abhishek Shetty, Eleni Katifori, Emanuela Del Gado, James P. Sethna, Bulbul Chakraborty, Itai Cohen","doi":"10.1122/8.0000697","DOIUrl":"https://doi.org/10.1122/8.0000697","url":null,"abstract":"Nearly, all dense suspensions undergo dramatic and abrupt thickening transitions in their flow behavior when sheared at high stresses. Such transitions occur when the dominant interactions between the suspended particles shift from hydrodynamic to frictional. Here, we interpret abrupt shear thickening as a precursor to a rigidity transition and give a complete theory of the viscosity in terms of a universal crossover scaling function from the frictionless jamming point to a rigidity transition associated with friction, anisotropy, and shear. Strikingly, we find experimentally that for two different systems—cornstarch in glycerol and silica spheres in glycerol—the viscosity can be collapsed onto a single universal curve over a wide range of stresses and volume fractions. The collapse reveals two separate scaling regimes due to a crossover between frictionless isotropic jamming and frictional shear jamming, with different critical exponents. The material-specific behavior due to the microscale particle interactions is incorporated into a scaling variable governing the proximity to shear jamming, that depends on both stress and volume fraction. This reformulation opens the door to importing the vast theoretical machinery developed to understand equilibrium critical phenomena to elucidate fundamental physical aspects of the shear thickening transition.","PeriodicalId":16991,"journal":{"name":"Journal of Rheology","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135481366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Viscosity experiments of slag-spinel suspensions: The effect of volume fraction, particle size, and shear rate 渣尖晶石悬浮液粘度实验:体积分数、粒度和剪切速率的影响

2区工程技术

Journal of Rheology Pub Date : 2023-10-04 DOI: 10.1122/8.0000690

Olivier Vergote, Inge Bellemans, Amy Van den Bulck, Maksym Shevchenko, Roman Starykh, Evgueni Jak, Kim Verbeken

{"title":"Viscosity experiments of slag-spinel suspensions: The effect of volume fraction, particle size, and shear rate","authors":"Olivier Vergote, Inge Bellemans, Amy Van den Bulck, Maksym Shevchenko, Roman Starykh, Evgueni Jak, Kim Verbeken","doi":"10.1122/8.0000690","DOIUrl":"https://doi.org/10.1122/8.0000690","url":null,"abstract":"Heterogeneous slag viscosity measurements have a wide variety of parameters, such as particle size, shape, solid volume fraction, and shear rate, which affect the final measured viscosity. Often, some of these parameters are neglected or predicted via models, since it is experimentally difficult to determine them during high-temperature slag viscosity measurements. In this work, a viscosity apparatus was used, which allows quenching of the sample after measurement. This way, all relevant parameters could be experimentally determined. The viscosities of three datasets were studied with various spinel sizes: small (13 μm), medium (34 μm), and large particles (76 μm). Within each dataset, the composition of the liquid slag matrix was kept constant to uniquely measure the effect of solids. Shear thinning, i.e., a decreasing viscosity with increasing shear rate, was observed for all samples, even at a low vol. % of 1.8. Moreover, stronger shear thinning was observed at a higher vol. % and for smaller spinel particles. On the basis of these results, the phenomenon of shear thinning was discussed and mainly attributed to the particle–particle orientation in the suspension. The obtained viscosity values were used to optimize a Krieger–Dougherty equation, which describes the viscosity increase caused by the presence of a certain vol. % of spinel particles, with a certain size and at a specific shear rate.","PeriodicalId":16991,"journal":{"name":"Journal of Rheology","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135590506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of instrument inertia on the initiation of oscillatory flow in stress controlled rheometry 应力控制流变法中仪器惯量对振荡流起始的影响

2区工程技术

Journal of Rheology Pub Date : 2023-10-04 DOI: 10.1122/8.0000665

Adeniyi Ogunkeye, Rebecca E. Hudson, Daniel J. Curtis

引用次数: 0

Unified interpretation of MAOS responses via experimentally decomposed material functions 通过实验分解材料函数统一解释MAOS响应

2区工程技术

Journal of Rheology Pub Date : 2023-10-03 DOI: 10.1122/8.0000702

Yul Hui Shim, Piyush K. Singh, Simon A. Rogers

{"title":"Unified interpretation of MAOS responses via experimentally decomposed material functions","authors":"Yul Hui Shim, Piyush K. Singh, Simon A. Rogers","doi":"10.1122/8.0000702","DOIUrl":"https://doi.org/10.1122/8.0000702","url":null,"abstract":"Oscillatory shear testing, used to characterize the viscoelastic response of soft materials, is often divided into small, medium, and large amplitude oscillatory shear (SAOS, MAOS, and LAOS) regions. SAOS is a common test that gives us a unified analysis and interpretation of linear viscoelastic behavior, whereas understanding MAOS and LAOS is still an active area of research. While numerous mathematical techniques have been proposed, a consensus interpretation is still missing. Recently, our understanding of nonlinear behavior in the LAOS regime has been developed using iterative recovery tests. Recovery rheology decomposes the strain into two components, allowing an unambiguous interpretation of the nonlinear behavior in terms of sequences of recoverable and unrecoverable processes. In this work, we revisit the MAOS material functions for polyvinyl alcohol-borax hydrogel and worm-like micelles using recovery rheology. We show that two mathematical formalisms, the Chebyshev and sequence of physical processes analyses, provide competing physical interpretations when they are derived from the total strain, but provide unified interpretations when describing the decomposed strains. We, therefore, show that what has often been treated as a mathematical problem can instead be solved experimentally by acknowledging the extra information provided by recovery rheology.","PeriodicalId":16991,"journal":{"name":"Journal of Rheology","volume":"205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135739295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Data-driven rheological characterization of stress buildup and relaxation in thermal greases 热润滑脂中应力积累和松弛的数据驱动流变特性

2区工程技术

Journal of Rheology Pub Date : 2023-10-02 DOI: 10.1122/8.0000679

Nagrani, Pranay P., Kulkarni, Ritwik V., Kelkar, Parth U., Corder, Ria D., Erk, Kendra A., Marconnet, Amy M., Christov, Ivan C.

{"title":"Data-driven rheological characterization of stress buildup and relaxation in thermal greases","authors":"Nagrani, Pranay P., Kulkarni, Ritwik V., Kelkar, Parth U., Corder, Ria D., Erk, Kendra A., Marconnet, Amy M., Christov, Ivan C.","doi":"10.1122/8.0000679","DOIUrl":"https://doi.org/10.1122/8.0000679","url":null,"abstract":"Thermal greases, often used as thermal interface materials, are complex paste-like mixtures composed of a base polymer in which dense metallic (or ceramic) filler particles are dispersed to improve the heat transfer properties of the material. They have complex rheological properties that impact the performance of the thermal interface material over its lifetime. We perform rheological experiments on thermal greases and observe both stress relaxation and stress buildup regimes. This time-dependent rheological behavior of such complex fluid-like materials is not captured by steady shear-thinning models often used to describe these materials. We find that thixo-elasto-visco-plastic (TEVP) and nonlinear-elasto-visco-plastic (NEVP) constitutive models characterize the observed stress relaxation and buildup regimes, respectively. Specifically, we use the models within a data-driven approach based on physics-informed neural networks (PINNs). PINNs are used to solve the inverse problem of determining the rheological model parameters from the dynamic response in experiments. These training data are generated by startup flow experiments at different (constant) shear rates using a shear rheometer. We validate the “learned” models by comparing their predicted shear stress evolution to experiments under shear rates not used in the training datasets. We further validate the learned TEVP model by solving a forward problem numerically to determine the shear stress evolution for an input step-strain profile. Meanwhile, the NEVP model is further validated by comparison to a steady Herschel–Bulkley fit of the material’s flow curve.","PeriodicalId":16991,"journal":{"name":"Journal of Rheology","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135789989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two-point microrheology and diffusing wave spectroscopy 两点微流变学和漫射波光谱学

2区工程技术

Journal of Rheology Pub Date : 2023-09-26 DOI: 10.1122/8.0000664

Qi Li, Kimberly A. Dennis, Yu-Fan Lee, Eric M. Furst

引用次数: 0

A trade-off between hardness and stretchability of associative networks during the sol-to-gel transition 在溶胶到凝胶过渡期间，结合网络的硬度和拉伸性之间的权衡

2区工程技术

Journal of Rheology Pub Date : 2023-09-26 DOI: 10.1122/8.0000689

Xiao Cao, Li Peng, Xianbo Huang, Quan Chen

引用次数: 1

Blistering instability during capillary thinning of solutions of homo- and associative polymers 在毛细管稀释过程中的起泡不稳定性的同质和缔合聚合物的溶液

2区工程技术

Journal of Rheology Pub Date : 2023-09-18 DOI: 10.1122/8.0000703

Andrey V. Subbotin, Alexander N. Semenov

引用次数: 0

Precipitated wax content and yield stress of model wax-oil mixtures determined by arrest of flow during cooling at fixed stress 模型蜡油混合物的沉淀蜡含量和屈服应力是通过在固定应力下冷却时停止流动来确定的

2区工程技术

Journal of Rheology Pub Date : 2023-09-18 DOI: 10.1122/8.0000596

Conor G. Harris, Christina E. Rice, Abhishek Shetty, Luqman Mahir, Ronald G. Larson

{"title":"Precipitated wax content and yield stress of model wax-oil mixtures determined by arrest of flow during cooling at fixed stress","authors":"Conor G. Harris, Christina E. Rice, Abhishek Shetty, Luqman Mahir, Ronald G. Larson","doi":"10.1122/8.0000596","DOIUrl":"https://doi.org/10.1122/8.0000596","url":null,"abstract":"To estimate yield stress and other rheological properties relevant to modeling of wax deposition in pipelines where flow is continuous, but stress varies across the pipe radius, model wax-oil mixtures are cooled at multiple cooling rates under constant shear stress until a temperature is reached, at which flow is arrested by gelation due to wax crystal formation. From these data, combined with a measurement of temperature-dependence of precipitated wax concentration by differential scanning calorimetry, an apparent yield stress σy, below which flow is arrested at each temperature, is related to the concentration of precipitated wax Cp and the cooling rate. Results are reported for multiple concentrations in oil of two independent wax mixtures: a many-component commercial wax mimicking the composition of field oil, and a simpler six-alkane mixture. These transient rheological data are fit to a pseudo “Herschel–Bulkley” constitutive equation from which it is found that the yield stresses obtained during flow under cooling are generally an order of magnitude, or more, lower than the yield stresses obtained in the previous work in flow at a comparable constant temperature after cooling in the absence of flow. We also find a strong decrease in the arrest temperature with a decreasing cooling rate, with no convergence even at the lowest cooling rate of 0.0625 °C min−1, indicating that under slower cooling, flow continues even under low stresses. The cooling-rate-dependent yield stress obtained in our study under constant stress provides a challenge to the recent models of gelation under flow stress and is of relevance to wax deposition in pipelines.","PeriodicalId":16991,"journal":{"name":"Journal of Rheology","volume":"169 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135154028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0