Micro-scale Shear Viscosity Testing Approach and Viscosity Model of Polymer Melts

2012 ◽  
Vol 48 (16) ◽  
pp. 21 ◽  
Author(s):  
Minjie WANG
Keyword(s):  
Shear Viscosity ◽  
Polymer Melts ◽  
Viscosity Model ◽  
Micro Scale ◽  
Testing Approach ◽  
Scale Shear

Experimental Study on the Rheological Characteristics of Polymer Melts under Micro Scale Effect

2009 ◽  
Vol 628-629 ◽  
pp. 429-434 ◽  
Author(s):  
D.Y. Zhao ◽  
Y.F. Jin ◽  
Min Jie Wang ◽  
X.W. Sun ◽  
M.C. Song
Keyword(s):  
Experimental Study ◽  
Shear Rate ◽  
Scale Effect ◽  
Shear Viscosity ◽  
Arrhenius Equation ◽  
Polymer Melts ◽  
Rheological Characteristics ◽  
Capillary Rheometer ◽  
Micro Scale ◽  
Effects Of Temperature

The rheological characteristics of four polymer melts (PS, PMMA, PP and HDPE) are investigated by a capillary rheometer with the die diameters from 1.5mm to 0.5mm.The effects of temperature on shear viscosity and the effects of both temperature and shear rate on non-Newton exponent of melts are discussed when the die diameter is 0.5mm. The results show that the shear viscosity of four polymers decreases with the rise of shear rate. The shear viscosity of PS and PMMA increases with the decrease of die diameter, the shear viscosity of PP and HDPE decreases with die diameter and minute differences of shear viscosity with different die diameters are observed with the growth of shear rate. When the die diameter is 0.5mm, Arrhenius equation is found to be suitable to describe the relations between shear viscosity and temperature for four polymer melts. The non-Newton exponents of four polymer melts increase with the temperature and decrease with the rise of shear rate.

Fitting and Verification Viscosity Parameter of ABS/Aluminum Blends

2011 ◽  
Vol 308-310 ◽  
pp. 824-830
Author(s):  
Hai Yan Zhu ◽  
Xiao Ting Xiao ◽  
Zhu Heng Zhang
Keyword(s):  
Shear Rate ◽  
Aluminum Powder ◽  
Shear Viscosity ◽  
Viscosity Model ◽  
Material Parameters ◽  
Viscosity Parameter ◽  
Powder Blends ◽  
Cae Analysis ◽  
Plastic Parts

Datas which are ABS and aluminum powder blends shear rate and shear viscosity have been tested by capillary rheometer.Fitting parameters of Cross-WLF viscosity model and using the material parameters to establish the appropriate database which is in CAE software.At the same time the database is used to established for studying the warpage of plastic parts,to compare the account of warpage of the actual injection,the warping deformation obtained results of two methods are very similar.Demonstrate the effective of using the database established in CAE analysis.

scholarly journals New Considerations on the Determination of the Apparent Shear Viscosity of Polymer Melt with Micro Capillary Dies

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4451
Author(s):  
Wangqing Wu ◽  
Ke Zeng ◽  
Baishun Zhao ◽  
Fengnan Duan ◽  
Fengze Jiang
Keyword(s):  
Shear Viscosity ◽  
Compaction Pressure ◽  
Experimental Studies ◽  
Polymer Melt ◽  
Rheological Measurement ◽  
Shear Rates ◽  
Micro Scale ◽  
Viscosity Determination ◽  
Main Factor

Capillary rheometers have been widely used for the rheological measurement of polymer melts. However, when micro capillary dies are used, the results are usually neither accurate nor consistent, even under the same measurement conditions. In this work, theoretical modeling and experimental studies were conducted for a more profound understanding of the mechanism by which the initial and boundary conditions influence the inaccuracy in the apparent shear viscosity determination with micro capillary dies (diameters: 500 μm, 200 μm, 100 μm). The results indicate that the amount of polymer initially in the barrel, the pre-compaction pressure and the capillary die diameter have a significant influence on the development of the micro scale inlet pressure, which directly determines the accuracy of the measurement at low and medium shear rates. The varying melt compressibility was confirmed to be the main factor directly related to the inaccuracy in the micro scale apparent shear viscosity determination. It is suggested that measures such as reducing the amount of polymer initially in the barrel and increasing the pre-compaction pressure could be used to reduce the measurement inaccuracy.

Prediction of High-Pressure/High-Temperature Rheological Properties of Drilling Fluids from the Viscosity Data Measured on a Coaxial Cylinder Viscometer

SPE Journal ◽  
2021 ◽  
pp. 1-22
Author(s):  
Sidharth Gautam ◽  
Chandan Guria ◽  
Laldeep Gope
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Shear Viscosity ◽  
Drilling Fluid ◽  
Viscosity Model ◽  
Drilling Fluids ◽  
Viscosity Data ◽  
Monitoring And Control ◽  
High Pressure High Temperature ◽  
Proposed Model

Summary Determining the rheology of drilling fluid under subsurface conditions—that is, pressure > 103.4 MPa (15,000 psi) and temperature > 450 K (350°F)—is very important for safe and trouble-free drilling operations of high-pressure/high-temperature (HP/HT) wells. As the severity of HP/HT wells increases, it is challenging to measure downhole rheology accurately. In the absence of rheology measurement tools under HP/HT conditions, it is essential to develop an accurate rheological model under extreme conditions. In this study, temperature- and pressure-dependence rheology of drilling fluids [i.e., shear viscosity, apparent viscosity (AV), and plastic viscosity (PV)] are predicted at HP/HT conditions using the fundamental momentum transport mechanism (i.e., kinetic theory) of liquids. Drilling fluid properties (e.g., density, thermal decomposition temperature, and isothermal compressibility), and Fann® 35 Viscometer (Fann Instrument Corporation, Houston, USA) readings at surface conditions, are the only input parameters for the proposed HP/HT shear viscosity model. The proposed model has been tested using 26 different types of HP/HT drilling fluids, including water, formate, oil, and synthetic oil as base fluids. The detailed error and the sensitivity analysis have been performed to demonstrate the accuracy of the proposed model and yield comparative results. The proposed model is quite simple and may be applied to accurately predict the rheology of numerous drilling fluids. In the absence of subsurface rheology under HP/HT conditions, the proposed viscosity model may be used as a reliable soft-sensor tool for the online monitoring and control of rheology under downhole conditions while drilling HP/HT wells.

Viscosity model for polydisperse polymer melts

1998 ◽  
Vol 42 (4) ◽  
pp. 951-969 ◽  
Author(s):  
D. Nichetti ◽  
I. Manas-Zloczower
Keyword(s):  
Polymer Melts ◽  
Viscosity Model ◽  
Polydisperse Polymer

Deformation texture transition in brass: critical role of micro-scale shear bands

2000 ◽  
Vol 48 (10) ◽  
pp. 2665-2673 ◽  
Author(s):  
E. El-Danaf ◽  
S.R. Kalidindi ◽  
R.D. Doherty ◽  
C. Necker
Keyword(s):  
Critical Role ◽  
Shear Bands ◽  
Deformation Texture ◽  
Micro Scale ◽  
Texture Transition ◽  
Scale Shear

Capillary study on geometrical dependence of shear viscosity of polymer melts

2013 ◽  
Vol 131 (6) ◽  
pp. n/a-n/a ◽  
Author(s):  
Xiang Lin ◽  
Adrian Kelly ◽  
Mike Woodhead ◽  
Dongyun Ren ◽  
Kuisheng Wang ◽  
...  
Keyword(s):  
Shear Viscosity ◽  
Polymer Melts
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