Journal of Non-Newtonian Fluid Mechanics最新文献_第10页

A network model for gas invasion into porous media filled with yield-stress fluid 气体侵入充满屈服应力流体的多孔介质的网络模型

IF 3.1 2区工程技术

Journal of Non-Newtonian Fluid Mechanics Pub Date : 2023-11-20 DOI: 10.1016/j.jnnfm.2023.105155

A. Pourzahedi , I.A. Frigaard

引用次数: 0

Uncertainty quantification for the squeeze flow of generalized Newtonian fluids 广义牛顿流体挤压流动的不确定度量化

IF 3.1 2区工程技术

Journal of Non-Newtonian Fluid Mechanics Pub Date : 2023-11-14 DOI: 10.1016/j.jnnfm.2023.105154

Aricia Rinkens, Clemens V. Verhoosel, Nick O. Jaensson

{"title":"Uncertainty quantification for the squeeze flow of generalized Newtonian fluids","authors":"Aricia Rinkens, Clemens V. Verhoosel, Nick O. Jaensson","doi":"10.1016/j.jnnfm.2023.105154","DOIUrl":"10.1016/j.jnnfm.2023.105154","url":null,"abstract":"<div><p>The calibration of rheological parameters in the modeling of complex flows of non-Newtonian fluids can be a daunting task. In this paper we demonstrate how the framework of uncertainty quantification (UQ) can be used to improve the predictive capabilities of rheological models in such flow scenarios. For this demonstration, we consider the squeeze flow of generalized Newtonian fluids. To systematically study uncertainties, we have developed a tailored squeeze flow setup, which we have used to perform experiments with glycerol and PVP solution. To mimic these experiments, we have developed a three-region truncated power law model, which can be evaluated semi-analytically. This fast-to-evaluate model enables us to consider uncertainty propagation and Bayesian inference using (Markov chain) Monte Carlo techniques. We demonstrate that with prior information obtained from dedicated experiments – most importantly rheological measurements – the truncated power law model can adequately predict the experimental results. We observe that when the squeeze flow experiments are incorporated in the analysis in the case of Bayesian inference, this leads to an update of the prior information on the rheological parameters, giving evidence of the need for recalibration in the considered complex flow scenario. In the process of Bayesian inference we also obtain information on quantities of interest that are not directly observable in the experimental data, such as the spatial distribution of the three flow regimes. In this way, besides improving the predictive capabilities of the model, the uncertainty quantification framework enhances the insight into complex flow scenarios.</p></div>","PeriodicalId":54782,"journal":{"name":"Journal of Non-Newtonian Fluid Mechanics","volume":"322 ","pages":"Article 105154"},"PeriodicalIF":3.1,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0377025723001672/pdfft?md5=82e2413cb533854a1f582bfe4f1cdf43&pid=1-s2.0-S0377025723001672-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135763399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wormlike Micelles revisited: A comparison of models for linear rheology 重新审视虫状胶束:线性流变学模型的比较

IF 3.1 2区工程技术

Journal of Non-Newtonian Fluid Mechanics Pub Date : 2023-11-14 DOI: 10.1016/j.jnnfm.2023.105149

Joseph D. Peterson , Weizhong Zou , Ronald G. Larson , Michael E. Cates

引用次数: 1

Analytical solution for channel flow of a Giesekus fluid with non-zero solvent viscosity 非零溶剂黏度Giesekus流体通道流动的解析解

IF 3.1 2区工程技术

Journal of Non-Newtonian Fluid Mechanics Pub Date : 2023-11-13 DOI: 10.1016/j.jnnfm.2023.105152

Irene Daprà , Giambattista Scarpi

引用次数: 0

Designing a swimming rheometer to measure the linear and non-linear properties of a viscoelastic fluid 设计一种游动流变仪来测量粘弹性流体的线性和非线性特性

IF 3.1 2区工程技术

Journal of Non-Newtonian Fluid Mechanics Pub Date : 2023-11-13 DOI: 10.1016/j.jnnfm.2023.105151

Boon Siong Neo , Eric S.G. Shaqfeh

{"title":"Designing a swimming rheometer to measure the linear and non-linear properties of a viscoelastic fluid","authors":"Boon Siong Neo , Eric S.G. Shaqfeh","doi":"10.1016/j.jnnfm.2023.105151","DOIUrl":"10.1016/j.jnnfm.2023.105151","url":null,"abstract":"<div><p><span><span><span>At low Reynolds numbers, “swirlers” – swimmers with an axisymmetric “head” and “tail” counterrotating about the axis of symmetry – generate no net propulsion in a </span>Newtonian fluid<span> as a consequence of the “scallop theorem”. Viscoelasticity<span> in the suspending fluid breaks the time-reversibility and allows swirlers to propel themselves, with the swim speed being a function of swimmer geometry, fluid elasticity, and swimming gait. Using analytical theory and numerical simulations, we study the unsteady motion of a freely-suspended self-propelled swirler though viscoelastic fluids described by the Giesekus model, allowing for general axisymmetric geometry and time-dependent tail rotation rate. We show the steady swim speed can be calculated for general arbitrary axisymmetric geometries at low Deborah number via the </span></span></span>reciprocal theorem<span> and the solution of two Newtonian flow problems. In this “weak flow” limit, we analytically determine the swim speed and its dependence on the parameters of the Giesekus fluid which in turn are related to the primary and secondary normal stress coefficients </span></span><span><math><msub><mrow><mi>Ψ</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span> and <span><math><msub><mrow><mi>Ψ</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span><span>. Furthermore, at low De, we derive the unsteady swim speed as a function of a specified unsteady tail rotation rate and the material properties of the suspending fluid. We show that for a particular tail rotation rate, the unsteady swim speed can be analyzed to recover the spectrum of fluid relaxation times, analogous to small-amplitude oscillatory shear measurements on a benchtop rheometer. This study expands upon the design space for a “swimming rheometer” by increasing its functionality to make and interpret rheological measurements.</span></p></div>","PeriodicalId":54782,"journal":{"name":"Journal of Non-Newtonian Fluid Mechanics","volume":"322 ","pages":"Article 105151"},"PeriodicalIF":3.1,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135714509","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

A robust numerical strategy for finding surface waves in flows of non-Newtonian liquids 寻找非牛顿液体流动中表面波的一种鲁棒数值策略

IF 3.1 2区工程技术

Journal of Non-Newtonian Fluid Mechanics Pub Date : 2023-11-13 DOI: 10.1016/j.jnnfm.2023.105153

Bruno P. Chimetta, Erick M. Franklin

{"title":"A robust numerical strategy for finding surface waves in flows of non-Newtonian liquids","authors":"Bruno P. Chimetta, Erick M. Franklin","doi":"10.1016/j.jnnfm.2023.105153","DOIUrl":"https://doi.org/10.1016/j.jnnfm.2023.105153","url":null,"abstract":"<div><p>Gravity-driven flows of liquid films are frequent in nature and industry, such as in landslides, lava flow, cooling of nuclear reactors, and coating processes. In many of these cases, the liquid is non-Newtonian and has particular characteristics. In this paper, we analyze numerically the temporal stability of films of non-Newtonian liquids falling by gravity, on the onset of instability. The liquid flows over an incline, where surface waves appear under certain conditions, and we do not fix <em>a priori</em><span><span> its rheological behavior. For that, we made used of the Carreau–Yasuda model without assigning specific values to its constants, and we compute general stability solutions. The numerical strategy is based on expansions of Chebyshev polynomials for discretizing the Orr–Sommerfeld equation and boundary conditions, and a Galerkin method for solving the </span>generalized eigenvalue problem<span>. In addition, an Inverse Iteration method was implemented to increase accuracy and improve computational time. The result is a robust and light numerical tool capable of finding the critical conditions for different types of fluids, which we use to analyze some key fluids. We show that the outputs of the general code match previous solutions obtained for specific computations. Besides increasing our knowledge on surface-wave instabilities in non-Newtonian liquids, our findings provide a new tool for obtaining comprehensive solutions on the onset of instability.</span></span></p></div>","PeriodicalId":54782,"journal":{"name":"Journal of Non-Newtonian Fluid Mechanics","volume":"322 ","pages":"Article 105153"},"PeriodicalIF":3.1,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134656887","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

IF 3.1 2区工程技术

Journal of Non-Newtonian Fluid Mechanics Pub Date : 2023-11-08 DOI: 10.1016/j.jnnfm.2023.105148

Mateus C. Guimarães , Fernando T. Pinho , Carlos B. da Silva

{"title":"The similarity theory of free turbulent shear flows of viscoelastic fluids","authors":"Mateus C. Guimarães , Fernando T. Pinho , Carlos B. da Silva","doi":"10.1016/j.jnnfm.2023.105148","DOIUrl":"10.1016/j.jnnfm.2023.105148","url":null,"abstract":"<div><p>A new theory is formulated for the description of the conformation state of the polymer chains in free turbulent shear flows of viscoelastic fluids. Using self-similarity arguments and new scaling relations for the turbulent flux of conformation tensor we show the existence of minimum and maximum solvent dissipation reduction asymptotes, and four different polymer deformation regimes. The similarities with the maximum drag reduction asymptote of turbulent pipe flow<span> is discussed and new scaling laws are obtained for all components of the mean conformation tensor at each deformation regime. Analytical solutions for the self-similar transverse profiles of the conformation tensor components<span> are also obtained, providing the complete solution for the mean flow problem at the far field. The analysis is developed for both planar jets and wakes and covers the two limits of shear flows, with large and small velocity differences, respectively. Comparisons of the new theoretical results with several direct numerical simulations employing the FENE-P rheological model show excellent agreement.</span></span></p></div>","PeriodicalId":54782,"journal":{"name":"Journal of Non-Newtonian Fluid Mechanics","volume":"323 ","pages":"Article 105148"},"PeriodicalIF":3.1,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135515653","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

Pore-scale hydrodynamics of non-Newtonian power-law fluids across a partially blocked porous medium in a confined channel 非牛顿幂律流体在受限通道中通过部分堵塞多孔介质的孔隙尺度流体动力学

IF 3.1 2区工程技术

Journal of Non-Newtonian Fluid Mechanics Pub Date : 2023-11-08 DOI: 10.1016/j.jnnfm.2023.105150

Subhasisa Rath, Alexandros Terzis

{"title":"Pore-scale hydrodynamics of non-Newtonian power-law fluids across a partially blocked porous medium in a confined channel","authors":"Subhasisa Rath, Alexandros Terzis","doi":"10.1016/j.jnnfm.2023.105150","DOIUrl":"https://doi.org/10.1016/j.jnnfm.2023.105150","url":null,"abstract":"<div><p>Transport of non-Newtonian fluids in porous media is pervasive in many natural and industrial applications. However, capturing the rheological behaviors of fluids by direct experimental techniques is challenging at the pore-scale. This paper outlines the pore-scale hydrodynamic interactions of non-Newtonian power-law fluids across a partially blocked porous medium in the laminar flow regime by computational fluid dynamics. The porous medium consists of an array of uniformly arranged square pillars. We explore the complex interplay of power-law rheology and Reynolds number on the microscopic flow field at the pore-scale. We capture the momentum transfer at the permeable interface between the porous and non-porous regions through stream-wise and span-wise velocity components and average volumetric flow rates at each pore-throat. Our results unveil a significant augmentation in stream-wise momentum by shear-thinning behavior and a diminution in momentum by shear-thickening behavior of the fluid through the porous medium. Further, the flow-leakage at the top interface purely depends on the combined effects of Reynolds number and power-law index. The channel pressure drop between the windward and leeward faces of the porous medium increases with the power-law index at low Reynolds number, while it decreases at high Reynolds number. Moreover, we provide a simple numerical framework to comprehend how the power-law behavior of the fluid dynamically regulates the flow field at the pore-scale.</p></div>","PeriodicalId":54782,"journal":{"name":"Journal of Non-Newtonian Fluid Mechanics","volume":"322 ","pages":"Article 105150"},"PeriodicalIF":3.1,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89990388","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

Predictions of the behavior of a single droplet and blends composed of Newtonian/viscoelastic minor phase and viscous major phase subjected to oscillatory shear flow 单液滴和由牛顿/粘弹性小相和粘性主相组成的混合物在振荡剪切流下的行为预测

IF 3.1 2区工程技术

Journal of Non-Newtonian Fluid Mechanics Pub Date : 2023-11-03 DOI: 10.1016/j.jnnfm.2023.105146

Abdulwahab S. Almusallam, T.B. Bini

{"title":"Predictions of the behavior of a single droplet and blends composed of Newtonian/viscoelastic minor phase and viscous major phase subjected to oscillatory shear flow","authors":"Abdulwahab S. Almusallam, T.B. Bini","doi":"10.1016/j.jnnfm.2023.105146","DOIUrl":"10.1016/j.jnnfm.2023.105146","url":null,"abstract":"<div><p>The oscillatory behavior of Newtonian and viscoelastic droplets in a Newtonian phase and blends composed of viscoelastic minor phase in a Newtonian major phase are theoretically investigated in this work. The non-Newtonian constrained volume model predictions are compared to experimental oscillatory shearing flow data of droplet and blends that are available in the literature. For a Newtonian droplet in a Newtonian phase, the model describes experimental droplet behavior well at high viscosity ratio and high strain amplitude. For viscoelastic droplet in a Newtonian phase, the model predicts less deformation for viscoelastic droplet than a comparable Newtonian droplet. For large amplitude oscillatory shear rheological data of blends composed of Boger fluid minor phase in a Newtonian major phase, the model shows improvement in prediction of the elastic modulus at high viscosity ratio, compared to the Newtonian model. The model also shows good agreement with large and minimum strain elastic moduli and large and minimum rate dynamic viscosities for small and large viscosity ratio viscoelastic polymer blends. For the blend of Boger fluid minor phase in a Newtonian major phase at viscosity ratio larger than one, we find that elasticity contributes to total stress from small to large strain amplitude values. For the blend of Boger fluid minor phase in a Newtonian major phase at viscosity ratio smaller than one, we find that elasticity is important only at large values of strain amplitude. Moreover, for the aforementioned blend at viscosity ratio larger than one, the predicted Lissajous Bowditch plots of excess stress do not reflect droplet shape/droplet orientation, and the opposite is true for the small viscosity ratio blend. Investigation of droplet long semi axis for the large viscosity ratio blend at LAOS conditions reveals oscillations at two to three times the imposed frequency.</p></div>","PeriodicalId":54782,"journal":{"name":"Journal of Non-Newtonian Fluid Mechanics","volume":"322 ","pages":"Article 105146"},"PeriodicalIF":3.1,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135410196","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

Elastic stability of viscoelastic liquid films flowing on a porous substrate 在多孔基板上流动的粘弹性液膜的弹性稳定性

IF 3.1 2区工程技术

Journal of Non-Newtonian Fluid Mechanics Pub Date : 2023-10-30 DOI: 10.1016/j.jnnfm.2023.105147

Zhiwei Song, Zijing Ding

{"title":"Elastic stability of viscoelastic liquid films flowing on a porous substrate","authors":"Zhiwei Song, Zijing Ding","doi":"10.1016/j.jnnfm.2023.105147","DOIUrl":"https://doi.org/10.1016/j.jnnfm.2023.105147","url":null,"abstract":"<div><p><span>This paper investigates the linear stability<span> of viscoelastic liquid films flowing down an inclined porous substrate<span> analytically and numerically. It focuses on the Stokes flow of viscoelastic films and uncovers two unstable modes triggered by elasticity. The elastic surface mode with a long wave number is solved analytically and numerically. Our results also indicate elasticity can trigger an elasto-porous mode at small incline angle and ratio of film thickness to substrate thickness. The Oldroyd-B model is used for the constitutive relation between the strain and polymer stress. The classical Beavers–Joseph condition is applied to describe the boundary conditions at the fluid-porous interface (Beavers and Joseph, 1967). This condition represents the linear relationship between velocity gradient of fluid layer and velocity difference between two layers, </span></span></span><span><math><mrow><msub><mrow><mi>∂</mi></mrow><mrow><mi>z</mi></mrow></msub><mi>u</mi><mo>=</mo><mfrac><mrow><mi>α</mi></mrow><mrow><msqrt><mrow><mi>κ</mi></mrow></msqrt></mrow></mfrac><mrow><mo>(</mo><mi>u</mi><mo>−</mo><msub><mrow><mi>u</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo></mrow></mrow></math></span>, where <span><math><mi>α</mi></math></span> is the Beavers–Joseph coefficient, representing slip flow at the interface; <span><math><mi>κ</mi></math></span><span> is the permeability of the porous medium. Effects of porous medium properties, including permeability and depth ratio, as well as the impact of slip flow at the interface on the unstable modes are examined.</span></p></div>","PeriodicalId":54782,"journal":{"name":"Journal of Non-Newtonian Fluid Mechanics","volume":"322 ","pages":"Article 105147"},"PeriodicalIF":3.1,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91594036","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