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Lie Group Analysis of a Flow with Contaminant-Modified Viscosity

Raseelo J. Moitsheki
2007 Journal of Applied Mathematics  
A class of coupled system of diffusion equations is considered. Lie group techniques resulted in a rich array of admitted point symmetries for special cases of the source term.  ...  We also employ potential symmetry methods for chosen cases of concentration and a zero source term. Some invariant solutions are constructed using both classical Lie point and potential symmetries.  ...  Acknowledgments The author wishes to thank the National Research Foundation of South Africa under Thuthuka program, for the generous financial support, and Prof. O. D.  ... 
doi:10.1155/2007/38278 fatcat:nnxwm2xsnvbcpboxwebyc5glfy

A comparison of the modern Lie scaling method to classical scaling techniques

James Polsinelli, M. Levent Kavvas
2016 Hydrology and Earth System Sciences  
Key points of the Lie group theory, and the application of the Lie scaling transformation, are outlined and a comparison is made with two classical scaling models through two examples: unconfined groundwater  ...  flow and contaminant transport.  ...  The modified inspectional analysis is a variation of the first technique and in application resembles an intuitive version of the Lie scaling technique.  ... 
doi:10.5194/hess-20-2669-2016 fatcat:altcxcnsorgnjpden46r22fg2y

A comparison of the modern Lie scaling method to classical scaling techniques

J. Polsinelli, M. L. Kavvas
2015 Hydrology and Earth System Sciences Discussions  
flow and contaminant transport.  ...  Key points of the Lie group theory, and the application of the Lie scaling transformation, are outlined and a comparison is done with two classical scaling models through two examples: unconfined groundwater  ...  The modified inspectional analysis is a variation of the first technique and in application resembles an intuitive version of the Lie scaling technique.  ... 
doi:10.5194/hessd-12-10197-2015 fatcat:6ndsiww5vzec5jkmktcsakb6na

Symmetry Reductions of a Flow with Power Law Fluid and Contaminant-Modified Viscosity

R. Moitsheki, S. Abelman, T. Hayat
2010 Mathematical and Computational Applications  
In this study symmetry analysis is carried out for a system dealing with nonreactive pollutant transport along a single channel.  ...  Constitutive equations obeying a power law fluid are used in the description of the mathematical problem.  ...  SA acknowledges support received from the National Research Foundation of South Africa under grant number 72518.  ... 
doi:10.3390/mca15040685 fatcat:lnow2l246fan5mtynijrdurd2q

Artificial Aging Experiments of Neat and Contaminated Engine Oil Samples

András Lajos Nagy, Jan Rohde-Brandenburger, Ibolya Zsoldos
2021 Lubricants  
Contaminated aging with OME 3-5 resulted in a drop in antioxidant content and elevated kinematic viscosity.  ...  Six additional samples were subjected to an intermediate load case, with five of them contaminated with selected conventional fuels and novel automotive fuel candidates.  ...  Acknowledgments: The authors would like to thank the kind support of fellow researchers at AC2T research GmbH. Conflicts of Interest: The authors declare no conflicts of interest.  ... 
doi:10.3390/lubricants9060063 fatcat:k7r5d45sj5chxda74mb4wmcopu

Applications of Group Theoretical Methods to Non-Newtonian Fluid Flow Models: Survey of Results

Taha Aziz, F. M. Mahomed
2017 Mathematical Problems in Engineering  
Works which deal with the fundamental science of non-Newtonian fluids that are analyzed using the Lie group method and conditional symmetries are reviewed.  ...  Only papers published by a process of peer review in archival journals are reviewed and are grouped together according to the specific non-Newtonian models under investigation.  ...  Conflicts of Interest The authors declare that there are no conflicts of interest regarding the publication of this paper.  ... 
doi:10.1155/2017/6847647 fatcat:aejxzn5uuzafdkzof7lymehn7q

Komatiites I: Eruption and Flow

H. E. HUPPERT, R. S. J. SPARKS
1985 Journal of Petrology  
A major consequence of this low viscosity is that most lavas erupted as turbulent flows.  ...  A quantitative analysis of the cooling of komatiites indicates cooling rates from over 1000 °C hr"' to a few °C hr" 1 , while the flows remained turbulent.  ...  It is a pleasure to thank Mark Hallworth, who helped us with the experiments and preparation of the figures, and who is supported by the NERC. We also acknowledge fruitful discussions with  ... 
doi:10.1093/petrology/26.3.694 fatcat:ezoawf2xbfar7ornkbrm7manjq

Surface tension of polyoxyethylene glycol solutions

A. Couper, D. D. Eley
1948 Journal of Polymer Science  
Molecular weight determinations by end-group analysis and freezing-point depression are compared with values of the intrinsic viscosity and limiting area per molecule.  ...  such as might indicate the formation of micelles.2 The viscosities were taken with a modified Ostwald viscometer with the precautions de- scribed by Gee* and the freezing points in the usual Beckman apparatus  ... 
doi:10.1002/pol.1948.120030306 fatcat:ngvbeeklxzda7n7xqijlaskmmu

Sludge Formation Analysis in Hydraulic Oil of Load Haul Dumper 811MK V Machine Running at Elevated Temperatures for Bioenergy Applications

MohdAhteshamHussain Siddiqui, Sandeep K Pal, Nagesh Dewangan, Somnath Chattopadhyaya, Shubham Sharma, Saeed Nekoonam, Alibek Issakhov, Alireza Baghban
2021 International Journal of Chemical Engineering  
Variation in the behaviour of the hydraulic fluid with respect to time, temperature, shear stress, and shear rate was studied, and the result is validated with correlation and regression analyses.  ...  The test result is plotted in a 3D view graph using the MATLAB R 2019 software for a better explanation.  ...  Acknowledgments e authors thank M/s Sun Oil, Kolkata, for their entire support and cooperation, providing test reports, and enhancing the performance of hydraulic oil by adding a percentage of an antioxidant  ... 
doi:10.1155/2021/4331809 fatcat:jeuqveow7vhnxngdupftaounsy

The viscosity of magmatic silicate liquids; a model calculation

Y. Bottinga, D. F. Weill
1972 American Journal of Science  
modifiers causes a decrease of viscosity.  ...  Of the total number of comparisons made, 77% lie between -0.25 < Aln n < 0.25, and 99% lie between -0.75 < Aln n < 0.75.  ...  modifiers causes a decrease of viscosity.  ... 
doi:10.2475/ajs.272.5.438 fatcat:5er5am4gfba2xdx2zaitrvsvjm

Micro-Flow Imaging: Flow Microscopy Applied to Sub-visible Particulate Analysis in Protein Formulations

Deepak K. Sharma, Dave King, Peter Oma, Clark Merchant
2010 AAPS Journal  
A complication in measuring protein particulates in many formulations is the simultaneous presence of other particle types such as silicone micro-droplets, air bubbles, and extrinsic contaminants.  ...  In addition, for much of the size range of concern, no practical measurement method with adequate sensitivity and repeatability has been available.  ...  During one such study, a concentrated monoclonal antibody formulation (150 mg/mL) with a viscosity of 10 cP was used to investigate the accuracy and precision of MFI.  ... 
doi:10.1208/s12248-010-9205-1 pmid:20517661 pmcid:PMC2895433 fatcat:e7hiw6wf3ffpxecedpmwsvmahi

Hydrodynamic modeling and the QGP shear viscosity

Huichao Song
2012 European Physical Journal A  
In this article, we will briefly review the recent progress on hydrodynamic modeling and the extraction of the quark-gluon plasma (QGP) specific shear viscosity with an emphasis on results obtained from  ...  the hybrid model VISHNU that couples viscous hydrodynamics for the macroscopic expansion of the QGP to the hadron cascade model for the microscopic evolution of the late hadronic stage.  ...  The shear viscosity reduces the development of collective flow, leading to a suppression of the elliptic and triangular flow as observed by different groups [8, 9, 10, 11, 12, 13, 14, 39, 40, 41] .  ... 
doi:10.1140/epja/i2012-12163-9 fatcat:47grgvf4o5dvdohhss26t2b3vq

RHEOLOGICAL INVESTIGATION AND DEVELOPMENT OF HIGH-PRESSURE AND HIGH-TEMPERATURE DRILLING FLUID

Sidharth Gautam
2022 figshare.com  
Similarly, a pressure- and temperature-de [...]  ...  Input parameters for the HPHT shear viscosity model are (i) thermal decomposition temperature, (ii) isothermal compressibility, and (iii) reference shear viscosity of drilling fluid at the surface conditions  ...  A similar observation was also obtained from flow point analysis (Table 4 .5).  ... 
doi:10.6084/m9.figshare.20457033.v1 fatcat:oubntzyzjzd63ez3mt7vgyh2im

Stability of axisymmetric core–annular flow in the presence of an insoluble surfactant

M. G. BLYTH, H LUO, C. POZRIKIDIS
2006 Journal of Fluid Mechanics  
The effect of an insoluble surfactant on the stability of the core-annular flow of two immiscible fluids is investigated by a normal-mode linear analysis and by numerical simulations based on the immersed-interface  ...  The results reveal that, although the Marangoni stress due to surfactant concentration variations is unable to initiate a new type of instability as in the case of twodimensional two-layer channel flow  ...  As in figure 5 , the flow is unstable for wavenumbers that lie below each curve, and stable for wavenumber that lie above each curve.  ... 
doi:10.1017/s0022112005007627 fatcat:rg6txevl6vbvdj3e7teyzgy2mq

Protein analysis by time-resolved measurements with an electro-switchable DNA chip

Andreas Langer, Paul A. Hampel, Wolfgang Kaiser, Jelena Knezevic, Thomas Welte, Valentina Villa, Makiko Maruyama, Matej Svejda, Simone Jähner, Frank Fischer, Ralf Strasser, Ulrich Rant
2013 Nature Communications  
However, as these principles are mutually exclusive, a comprehensive characterization of proteins usually involves a multi-step workflow.  ...  Although the immobilization of molecules on solid supports allows for the parallel analysis of interactions, properties like size or shape are usually inferred from the molecular mobility under the influence  ...  Niemax for developing setups, to A. Ziegltrum, E. Herold and A. Schwemer for experimental assistance, and to G. Abstreiter for his support.  ... 
doi:10.1038/ncomms3099 pmid:23839273 pmcid:PMC3719012 fatcat:4etlhd6cdjeo7lidnauldyopqe
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