2 edition of Start-up flows of thixotropic fluids in pipes found in the catalog.
Start-up flows of thixotropic fluids in pipes
Brian R. Parker
|The Physical Object|
|Number of Pages||220|
yield stress and thixotropic properties. Oscillating flows in pipes have been studied by many authors, most notably by Schlicting2, Uchida3, Clamen & Minton4, Zhao5, and in the book by Bird et al The following simplified Navier-Stokes equation is solved: 2 2 u1p u1u tx trr (1) All fluids are subject to friction when they are in motion. The higher the fluid viscosity, the higher the friction force for the same flow rate. Friction is produced internally as one layer of fluid moves with respect to another and also at the fluid wall interface. Rough pipes will also produce high ://
Global sustainable development of the world economy requires better understanding and utilization of natural recourses. In this endeavor rheology has an indispensable role. The Rheology Conferences are therefore always an important event for science and technology. The Fifth European › Engineering › Mechanics. This broad-based book covers the three major areas of Chemical Engineering. Most of the books in the market involve one of the individual areas, namely, Fluid Mechanics, Heat Transfer or Mass Transfer, rather than all the three. This book presents this material in a single ://?dsource=mostpopular.
Operation of Municipal Wastewater Treatment We study natural convection of viscoplastic fluids in 2D domains. A sufficiently large yield stress introduces a static solution to the Navier–Stokes equations that may not otherwise exist. We find conditions that guarantee such motionless regimes and investigate flow development between static and advective states. Considering three problems, we explore the various ways in which the yield
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Parameters were developed, such as the start-up time of the rheometer, the character of the start-up (whether it is oscillatory or damped), and an approximate value for the shear rate at the wall of the inner cylinder. Isothermal Stationary Flow of a Thixotropic Fluid in a Horizontal Circular Tube Thixotropic fluids are characterised by a gradual decrease of viscosity under increased shear and its gradual increase when shear is reduced; antithixotropic (rheopectic) fluids exhibit the opposite behaviour.
Thixotropy is a property of many everyday fluids, including foods such as tomato sauce and some paints; 1 1. :// Request PDF | Turbulent pipe flow of thixotropic fluids | In this work, aqueous suspensions of 1% and % by weight laponite and a blend of %/% laponite/carboxymethil cellulose (CMC) are /_Turbulent_pipe_flow_of_thixotropic_fluids.
Direct numerical simulations of transitional and turbulent flows of purely viscous thixotropic liquids in stirred tanks have been performed. The simple thixotropy model used is based on the notion FLOWS IN PIPES Thixotropic liquid when enters a long pipe from a large vessel in which it can be allowed to rest, the velocity and pres-sure fields which develops is very complex.
In the start-up of the flow of thixotropic liquid the large pressure can cause con-siderable problems in necessary pump performance. Some- For the thixotropic fluid, there is a pressure overshoot before the well is shut, which is caused by the dominant elastic behavior at the kick start-up and by the gel structure break-down along the well (Oliveira and Negrão, ).
At t = s, the BHP for the three fluids Compressible fluids expands caused by pressure drops (friction) and the velocity will increase. Therefore is the pressure drop along the pipe not constant. Where: p 1 = Pressure incoming (kg/m 2) T 1 = Temperature incoming (°C) Start-up flows of thixotropic fluids in pipes book 2 = Pressure leaving (kg/m 2) T 2 = Temperature leaving (°C) fluids exhibit a yield stress below which no movement occurs.
They exhibit rigidity as force is applied up to a certain degree and then break down exhibiting usually pseudoplastic or thixotropic tendencies. They may be called yield pseudoplas-tics, Bingham plastics, false bodies, or any other name an author may care to coin.
Non-Newtonian Fluids: An Introduction R.P. Chhabra Abstract The objective of this chapter is to introduce and to illustrate the frequent and wide occurrence of non-Newtonian ﬂuid behaviour in a diverse range of ap-plications, both in nature and in technology. Starting with the deﬁnition of a non-~compflu/Lect-notes/ The start-up flow of thixotropic fluids in pipelines,Stevenage: Warren Spring Laboratory, Report n.
LR (MH) (). Google Scholar. De Angelis, E., Modelli stazionari e non International Symposium on Slurry Fl th American Mechanical Engineering The Flow of Complex Mixtures in Pipes, Van Nostrand Reinhold Co., New York Fluids, Pipes, Pressure, Valves, Water hammer, Yield stress, Waves, Flow (Dynamics) References.
Numerical Simulation of the Start-Up of Bingham Fluid Flows in Pipelines,” A Weakly Compressible Flow Model for the Restart of Thixotropic Drilling Fluids,” Thixotropic fluidsshow a decrease in η with time under a constant applied shear stress; many paints are thixotropic.
Rheopectic fluids show an increase in η with time. Viscoelastic After deformation some fluids partially return to their original shape when the applied stress is released; such fluids are called :// *) at room temperature.
Absolute or Dynamic Viscosity of common Liquids; Kinematic Viscosity. Kinematic viscosity is the ratio of - absolute (or dynamic) viscosity to density - a quantity in which no force is involved. Kinematic viscosity can be obtained by dividing the absolute viscosity of a fluid with the fluid mass density like Yield stress measurements have long been considered to be inconsistent and difficult, especially for a thixotropic colloid, since the thixotropic behavior gives rise to time-dependent rheological properties.
In this paper, we attempted measuring the yield stress of aqueous xanthan gum (XG) solutions in different XG concentration. Our rheological measurements showed that XG in aqueous solutions The influence of the solvent type on the rheological properties of Carbopol ® NF dispersions in water and in water/glycerol solutions is investigated.
The material formulation, preparation procedure, common experimental challenges and artifact sources are all addressed. Transient and steady-state experiments were performed. For both solvent types, a clearly thixotropic behavior occurs G.
Vinay, A. Wachs and I. Frigaard, “Start-up transients and efficient computation of isothermal waxy crude oil flows” J. non-Newtonian Fluid Mech.,pp.(). Vinay, A. Wachs and I. Frigaard, “Start-up of gelled waxy crude oil pipelines: a new analytical relation to predict the restart pressure.” Soc.
Newtonian and Non-Newtonian Flows Newtonian Non - Newtonian Rheology /03/09 5 Faculty of Pharmacy, Omer Al-Mukhtar University, Tobruk, Libya.
Newtonian Flow • Newton was the first to study the flow properties of liquids in quantitative terms. Liquids that obey Newton’s law of flow are called as Newtonian :// Alba K, Taghavi S, Frigaard I, “Displacement of yield stress fluids in inclined pipes” In proceedings of ECCOMASVienna, SeptemberAlba K, Taghavi S, Frigaard I, “A Weighted Residual Method for 2-Layer Flows with Yield Stress Fluids” In proceedings of ECCOMASVienna, SeptemberFluid Mechanics Frank White 5th Ed - ID:5ca11de.
Fluid Mechanics McGraw-Hill Series in Mechanical Engineering CONSULTING EDITORS Jack P. Holman, Southern Methodist Univ A waxy crude oil which gels below a threshold temperature has been investigated under static and dynamic conditions, using a combination of rheological methods, optical microscopy, and DSC.
Particular attention is given in this work to the influence of the mechanical history on gel strength and to describing the time-dependent rheological ://. Since first publication significant advances have been made in almost all areas covered in this book, which are incorporated in the new edition, including developments in CFD and computational techniques, velocity profiles in pipes, liquid/solid flows and applications to food processing, and new heat/mass transfer methods and models.*DRILLING FLUIDS The key to making the rotary drilling system work is the ability to circulate a fluid continuously down through the drill pipe, out through the bit nozzles and back to the surface.
The drilling fluid can be air, foam (a combination of air and liquid or a liquid. Liquid drilling fluids are commonly called drilling mud.
All drilling fluids, especially drilling mud, can have a This review provides an overview of the recent progress in the field of the rheology of grouts for historic masonry consolidation.
During the last two decades, significant research has been devoted on the grouting technique for stone masonry consolidation but most results are scattered by scientific papers, congress communications, and thesis. This paper compiles and briefly demonstrates the