Polymer Rheology最新文献

Particle Settling in a Non-Newtonian Fluid Medium Processed by Using the CEF Model 用CEF模型处理非牛顿流体介质中的颗粒沉降

Polymer Rheology Pub Date : 2018-10-03 DOI: 10.5772/INTECHOPEN.75977

Ş. Celasun

{"title":"Particle Settling in a Non-Newtonian Fluid Medium Processed by Using the CEF Model","authors":"Ş. Celasun","doi":"10.5772/INTECHOPEN.75977","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.75977","url":null,"abstract":"In this study, the settling of small particles in a non-Newtonian fluid medium is consid- ered. The simulation of this problem according to the fluid mechanics principles may be realized by the flow of a non-Newtonian fluid around a sphere falling along the centerline of a cylindrical tube. The knowledge of the rate of settling of particles in practice is particularly significant in determining the shelf life of materials such as foodstuffs, cleaning materials and many others. Thus, this problem has great importance in many natural and physical processes and in a large number of industrial applications such as chemical, genetic and biomedical engineering operations. The majority of the theoretical, experimental and numerical studies available in the literature deal with Newtonian fluids. Conversely, for non-Newtonian fluids the problem is considerably more complex. It is well-recognized that extensional behaviour in non-Newtonian fluids plays a major role in complex flows. Most non-Newtonian fluids such as polymeric solutions and melts exhibit shear-thinning behaviour. In this study it is aimed to determine the equations governing this process and some important conclusions about the properties of polymeric liquids related to their viscoelastic constitution are drawn. Effectively, it is found that for poly- meric liquids, the elastic behaviour characterized by the normal stress coefficients, implies relatively increased normal stresses with respect to the generalized Newtonian fluids, whereas the shear stresses tend to decrease, thus changing somewhat the category of the flow from shear-flow into extensional flow in a small rate. Hence, the viscoelastic property of the polymeric liquids must be stressed by their constitutive equation choice, which led us to the CEF model.","PeriodicalId":287617,"journal":{"name":"Polymer Rheology","volume":"358 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133303790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetorheology of Polymer Systems 聚合物体系的磁流变学

Polymer Rheology Pub Date : 2018-10-03 DOI: 10.5772/INTECHOPEN.75768

S. Vshivkov, E. Rusinova

引用次数: 4

Rheology of Highly Filled Polymers 高填充聚合物的流变学

Polymer Rheology Pub Date : 2018-10-03 DOI: 10.5772/INTECHOPEN.75656

C. Kukla, I. Duretek, J. Gonzalez-Gutierrez, C. Holzer

{"title":"Rheology of Highly Filled Polymers","authors":"C. Kukla, I. Duretek, J. Gonzalez-Gutierrez, C. Holzer","doi":"10.5772/INTECHOPEN.75656","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.75656","url":null,"abstract":"In many applications and/or manufacturing processes, highly filled polymers are necessary. One of these fields is powder metallurgy, where polymers or polymer mixtures are used to enable the shaping process within the production of the parts. Metal and also ceramic powders are mixed with different polymeric substances with a powder content of more than 50 vol%. Within the production, this mixture, called feedstock, has to flow into the final shape. Thus, for a proper understanding of the production processes, fundamental knowledge on the flow behavior of the feedstocks is required. For the rheology of polymers, several techniques together with the proper equipment are available. In the case of high viscosities, rotational and high-pressure capillary rheometers (HPCRs) are used. To gain reliable data, a proper measurement procedure is essential, which means that the operator has to have a deeper physical understanding of the material and the effects arising during the measurements. Therefore, this chapter gives an insight into rotational and high-pressure capillary rheometry with special emphasis on the behavior of polymers highly filled with stiff particles. Based thereon important remarks on the measurement equipment, procedure and evaluation of the measured data are provided.","PeriodicalId":287617,"journal":{"name":"Polymer Rheology","volume":"167 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122287237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Viscoelasticity of a Supramolecular Polymer Network and its Relevance for Enhanced Oil Recovery 一种超分子聚合物网络的粘弹性及其与提高采收率的相关性

Polymer Rheology Pub Date : 2018-10-03 DOI: 10.5772/INTECHOPEN.77277

L. Romero-Zerón, Saran Banthong

引用次数: 3

Effect of Maltodextrin Reduction and Native Agave Fructans Addition on the Rheological Behavior of Spray-Dried Juices 麦芽糖糊精还原和天然龙舌兰果聚糖加入对喷雾干燥果汁流变行为的影响

Polymer Rheology Pub Date : 2018-10-03 DOI: 10.5772/INTECHOPEN.75758

D. E. Jimenez-Sánchez, M. Calderón‐Santoyo, L. Picart-Palmade, Pedro Ulises Bautista Rosales, Julio CesarBarros-Castillo, J. A. Ragazzo‐Sánchez

引用次数: 0

Polymeric Additive Manufacturing: The Necessity and Utility of Rheology 聚合物增材制造:流变学的必要性和实用性

Polymer Rheology Pub Date : 2018-10-03 DOI: 10.5772/INTECHOPEN.77074

M. Elbadawi

引用次数: 20

Applications of Viscoelastic Fluids Involving Hydrodynamic Stability and Heat Transfer 粘弹性流体在流体动力学稳定性和传热方面的应用

Polymer Rheology Pub Date : 2018-04-03 DOI: 10.5772/INTECHOPEN.76122

I. Pérez-Reyes, René Osvaldo Vargas-Aguilar, S. Perez‐Vega, A. Ortiz-Perez

引用次数: 6

Interparticle Interaction Effects in Polymer Suspensions 聚合物悬浮液中的粒子间相互作用效应

Polymer Rheology Pub Date : 2018-03-14 DOI: 10.5772/INTECHOPEN.75207

N. Laufer, H. Hansmann, C. Boss, Stefan Ofe

{"title":"Interparticle Interaction Effects in Polymer Suspensions","authors":"N. Laufer, H. Hansmann, C. Boss, Stefan Ofe","doi":"10.5772/INTECHOPEN.75207","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.75207","url":null,"abstract":"Viscosity functions of particle-filled polymer melts are shifted to higher values in com - parison with those of the unfilled polymer melts. This increase is affected by a number of factors such as the volume content, size, size distribution and the aspect ratio of the suspended particles. If interparticle interactions occur, which include the formation and breaking of agglomerates as well as the migration and rotation of particles during flow, the extent of the viscosity increase of suspensions also depends on the applied shear stress. Filler with a high aspect ratio, such as fibrous and plate-like particles, exhibits a strong tendency for interparticle interactions even at low volumetric concentrations. However, depending on the polymer matrix, spherical particles can exhibit a range of negligible interparticle interactions at low filler volume concentrations. Non-negligible interactions occur at higher filler concentrations. On the basis of the generalized interaction function , which considers the transition from negligibly interparticle interactions to the domain of non-negligibly interactions, the flow behavior of particle-filled polymer melts can be estimated. The subject of this chapter is the application of the generalized interaction function for the characterization of the flow behavior of particle-filled polyolefin melts.","PeriodicalId":287617,"journal":{"name":"Polymer Rheology","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129426578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0