Measuring the Flow Properties of Yield Stress Fluids

Nguyen, Q. Dzuy; Boger, David V.

doi:10.1146/annurev.fl.24.010192.000403

Cited by 566 publications

(238 citation statements)

References 62 publications

Supporting

Mentioning

221

Contrasting

Unclassified

Order By: Relevance

“…This critical stress level, called the yield value or yield, is typically treated as a constant material property of the fluid. An extensive description of methods for measuring yield stress is given in [96]. Reported values for the yield stress of blood have a great variation ranging from 0.002 to 0.40 dynes/cm 2 , see e.g.…”

Section: Yield Stress Of Bloodmentioning

confidence: 99%

Methods of Blood Flow Modelling

Bessonov

Sequeira

Simakov

et al. 2015

Math. Model. Nat. Phenom.

157

View full text Add to dashboard Cite

Abstract. This review is devoted to recent developments in blood flow modelling. It begins with the discussion of blood rheology and its non-Newtonian properties. After that we will present some modelling methods where blood is considered as a heterogeneous fluid composed of plasma and blood cells. Namely, we will describe the method of Dissipative Particle Dynamics and will present some results of blood flow modelling. The last part of this paper deals with onedimensional global models of blood circulation. We will explain the main ideas of this approach and will present some examples of its application.

show abstract

Section: Yield Stress Of Bloodmentioning

confidence: 99%

Methods of Blood Flow Modelling

Bessonov

Sequeira

Simakov

et al. 2015

Math. Model. Nat. Phenom.

157

View full text Add to dashboard Cite

show abstract

“…In a recent report, Gauglitz et al (1994b) described the theory for using a capillary rheometer to measure the viscosity of bubbly slurries. Additional discussions of capillary rheometry are given by Nguyen and Boger (1992), Macosko (1994), and Barnes et al (1989). The theoretical analysis results in equations giving viscosity as a function of shear rate without assuming any model for the fluid; the analysis gives the following expression for the shear rate y, at the capillary wall.…”

Section: Viscosity Measurement By Capillary Rheometrymentioning

confidence: 99%

Gas bubble retention and its effect on waste properties: Retention mechanisms, viscosity, and tensile and shear strengths

Gauglitz¹,

Rassat²,

Powell³

1995

View full text Add to dashboard Cite

DISCLAIMERPortions of this document may be illegible in electronic image products. Images are produced from the best available original document. Executive SummarySeveral of the underground nuclear storage tanks at Hanford have been placed on a flammable gas watch list, because the waste is either known or suspected to generate, store, and episodically release flammable gases. Because retention and episodic release of flammable gases from these tanks containing radioactive waste slurries are critical safety concerns, Pacific Northwest Laboratory (PNL)(a) is studying physical mechanisms and waste properties that contribute to the episodic gas release from these storage tanks. This study is being conducted for Westinghouse Hanford Company as part of the PNL Flammable Gas project. Previous investigations have concluded that gas bubbles are retained by the slurry or sludge that has settled at the bottom of the tanks; however, the mechanisms responsible for the retention of these bubbles are not well understood.Understanding the rheological behavior of the waste, particularly of the settled sludge, is critical to characterizing the tendency of the waste to retain gas bubbles and the dynamics of how these bubbles are released from the waste. The presence of gas bubbles is expected to affect the rheology of the sludge, specifically its viscosity and tensile and shear strengths, but essentially no literature data are available to assess the effect of bubbles.The objectives of this study were to conduct experiments and develop theories to understand better how bubbles are retained by slurries and sludges, to measure the effect of gas bubbles on the viscosity of simulated slurries, and to measure the effect of gas bubbles on the tensile and shear strengths of simulated slurries and sludges. In addition to accomplishing these objectives, this study developed correlations, based on the new experimental data, that can be wed in large-scale computations of waste tank physical phenomena.For bubble retention experiments, a new method of creating retained bubbles was developed. Results show that dissolving soluble gases into the interstitial liquid followed by pressure reduction provides a suitable method of creating bubbles for measuring bubble retention in waste. An equilibrium CO, pressure of 2.4 x l(r Pa (20 psig) is sufficient to create good bubble nucleation and growth with slurries composed of water and glass beads. A pressure reduction rate of 6900 Palmin (1 psi/min) provided a controllable experiment.Experiments were completed to further quantify the transition between bubbles that grow by fingering between sludge particles, called dendritic bubbles, and bubbles that grow by displacing the sludge particles, which are referred to as round bubbles. Previously, a Bond number criterion, which is a ratio of gravitational to surface tension forces, was developed to define the transition between the two different mechanisms of bubble growth and retention. In the experiments conducted, the particle size and fluid and particle d...

show abstract

“…Consequently, a large number of tests have been developed to determine the yield stress of cement and similar materials (Asaga & Roy 1980;Tremblay et al 2001;Roussel et al 2005). However, the different tests often give very different results and even in controlled rheology experiments the same problem is well documented: depending on the measurement geometry and the detailed experimental protocol, very different values of the yield stress can be found (James et al 1987;Nguyen & Boger 1992;Barnes 1997Barnes , 1999Barnes & Nguyen 2001). Indeed it has been demonstrated that a variation of the yield stress of more than one order of magnitude can be obtained depending on the way it is measured (James et al 1987).…”

Section: Introduction: the Yield Stress Problemmentioning

confidence: 99%

An attempt to categorize yield stress fluid behaviour

Møller

Fall

Chikkadi

et al. 2009

Phil. Trans. R. Soc. A.

240

208

View full text Add to dashboard Cite

We propose a new view on yield stress materials. Dense suspensions and many other materials have a yield stress-they flow only if a large enough shear stress is exerted on them. There has been an ongoing debate in the literature on whether true yield stress fluids exist, and even whether the concept is useful. This is mainly due to the experimental difficulties in determining the yield stress. We show that most if not all of these difficulties disappear when a clear distinction is made between two types of yield stress fluids: thixotropic and simple ones. For the former, adequate experimental protocols need to be employed that take into account the time evolution of these materials: ageing and shear rejuvenation. This solves the problem of experimental determination of the yield stress. Also, we show that true yield stress materials indeed exist, and in addition, we account for shear banding that is generically observed in yield stress fluids.

show abstract

Measuring the Flow Properties of Yield Stress Fluids

Cited by 566 publications

References 62 publications

Methods of Blood Flow Modelling

Methods of Blood Flow Modelling

Gas bubble retention and its effect on waste properties: Retention mechanisms, viscosity, and tensile and shear strengths

An attempt to categorize yield stress fluid behaviour

Contact Info

Product

Resources

About