نتایج جستجو برای: type viscoelastic fluid

تعداد نتایج: 1549668  

Journal: :Energies 2022

We investigated the shear banding phenomena in non-isothermal simple-shear flow of a viscoelastic-fluid-based nanofluid (VFBN) subject to exothermic reactions. The polymeric (viscoelastic) behavior VFBN was modeled via Giesekus constitutive equation, with appropriate adjustments incorporate both and nanoparticle effects. Nahme-type laws were employed describe temperature dependence viscosities ...

Journal: :Journal of biomechanics 1968
R H Cox

The propagation of harmonic pressure waves through a Newtonian fluid contained within a thick-walled, viscoelastic tube is considered as a model of arterial blood flow. The fluid is assumed to be homogeneous and Newtonian, and its motion to be laminar and axisymmetric. The wall is assumed to be isotropic, incompressible, linear, and viscoelastic. It is also assumed that the motion is such that ...

Journal: :The Journal of chemical physics 2007
Jason C Thomas Richard L Rowley

A transient molecular dynamics (TMD) method has been developed for simulation of fluid viscosity. In this method a sinusoidal velocity profile is instantaneously overlaid onto equilibrated molecular velocities, and the subsequent decay of that velocity profile is observed. The viscosity is obtained by matching in a least-squares sense the analytical solution of the corresponding momentum transp...

2001
Peter T. Williams

Jets are ubiquitous in astronomy. It has been conjectured that the existence of jets is intimately connected with the spin of the central object and the viscous angular momentum transport of the inner disk. Bipolar jet-like structures propelled by the viscous torque on a spinning central object are also known in a completely different context, namely the flow in the laboratory of a viscoelastic...

Journal: :Journal of Mathematical Sciences 2022

In this paper, we study two problems describing small motions of partially dissipative hydraulic systems. The first problem concerns a system consisting viscoelastic fluid and barotropic gas located above the fluid; second “viscoelastic fluid–ideal fluid” in an immovable vessel. Using operator approach developed previous works authors, reduce both to Cauchy for differential-operator equation Hi...

2008
H.M.M. Matos P. J. Oliveira

A computational fluid dynamics simulation study has been carried out for unsteady laminar flow in a planar 2D T-junction, using non-Newtonian viscoelastic fluids with characteristics similar to those of blood. In the large blood vessels, blood can be modelled as a Newtonian fluid, however in smaller vessels it exhibits non-Newtonian behaviour, showing a shear-thinning viscosity and, additionall...

Journal: :Annals of botany 2013
Jonathan A Moran Laura K Gray Charles Clarke Lijin Chin

BACKGROUND AND AIMS Nepenthes (Nepenthaceae, approx. 120 species) are carnivorous pitcher plants with a centre of diversity comprising the Philippines, Borneo, Sumatra and Sulawesi. Nepenthes pitchers use three main mechanisms for capturing prey: epicuticular waxes inside the pitcher; a wettable peristome (a collar-shaped structure around the opening); and viscoelastic fluid. Previous studies h...

Journal: :Journal of colloid and interface science 2009
Yiyang Lin Xue Han Jianbin Huang Honglan Fu Cailan Yu

A simple and effective route to design pH-responsive viscoelastic wormlike micelles based on commercial compounds is reported. According to this route, pH-sensitive viscoelastic fluids can be easily obtained by introducing a pH-responsive hydrotrope into a surfactant solution. In this paper, the mixed system of cetyltrimethylammonium bromide (CTAB) and potassium phthalic acid (PPA) was studied ...

Journal: :CoRR 2015
Kristian Ejlebjerg Jensen Peter Szabó Fridolin Okkels

We have implemented the log-conformation method for two-dimensional viscoelastic flow in COMSOL, a commercial high-level finite element package. The code is verified for an Oldroyd-B fluid flowing past a confined cylinder. We are also able to describe the well-known bistability of the viscoelastic flow in a crossslot geometry for a FENE-CR fluid, and we describe the changes required for perform...

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