نتایج جستجو برای: fluid friction irreversibility

تعداد نتایج: 254201  

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2003
H J H Clercx G J F van Heijst M L Zoeteweij

The role of bottom friction and the fluid layer depth in numerical simulations and experiments of freely decaying quasi-two-dimensional turbulence in shallow fluid layers has been investigated. In particular, the power-law behavior of the compensated kinetic energy E0(t)=E(t)e(2lambda t), with E(t) the total kinetic energy of the flow and lambda the bottom-drag coefficient, and the compensated ...

2001
S. N. MAITRA

Amagnetohydrodynamic flow of a viscous, incompressible and slightly conducting fluid is developed between a parallel flat wall and a wavy wall whereas at the same time fluid is continuously sucked through the flat wall with a constant suction velocity. The velocity and temperature distribution are determined alongwith the pressure gradient and co-efficient of skin friction.

Journal: :Discrete Dynamics in Nature and Society 2004

Ali Reza Bahramian Mansour Kalbasi,

In the computational fluid dynamics (CFD) modeling of gas-solids two phase flow, the effect of boundary conditions play an important role in predicting the hydrodynamic characteristics of fluidized beds. In this work, the hydrodynamics of conical fluidized bed containing dried TiO2 nano-agglomerates were studied both experimentally and computationally. The pressure drop ...

Journal: :Arthritis and Rheumatism 2007
Gregory D Jay Jahn R Torres David K Rhee Heikki J Helminen Mika M Hytinnen Chung-Ja Cha Khaled Elsaid Kyung-Suk Kim Yajun Cui Matthew L Warman

OBJECTIVE The glycoprotein lubricin (encoded by the gene Prg4) is secreted by surface chondrocytes and synovial cells, and has been shown to reduce friction in vitro. In contrast to man-made bearings, mammalian diarthrodial joints must endogenously produce friction-reducing agents. This study was undertaken to investigate whether friction is associated with wear. METHODS The lubricating abili...

Journal: :Communications in Nonlinear Science and Numerical Simulation 2021

Time irreversibility, which characterizes nonequilibrium processes, can be measured based on the probabilistic differences between symmetric vectors. To simplify quantification of time permutations instead vectors have been employed in some studies. However, although effective practical applications, this approach is conceptually incorrect. irreversibility should rather than permutations, where...

2006
N. Andersson

We discuss vortex-mediated mutual friction in the two-fluid model for superfluid neutron star cores. Our discussion is based on the general formalism developed by Carter and collaborators, which makes due distinction between transport velocity and momentum for each fluid. This is essential for an implementation of the so-called entrainment effect, whereby the flow of one fluid imparts momentum ...

2016
Yong Hoon Lee Jonathon Schuh Randy H. Ewoldt James T. Allison

Minimizing energy loss and improving system load capacity and compactness are important objectives for fluid power applications. Recent studies have revealed that a micro-textured surface can reduce friction in full-film lubrication, and an asymmetric textured surface can further improve the performance by reducing friction and increasing normal force simultaneously. As an extension of these pr...

Journal: :I. J. Bifurcation and Chaos 2005
Nathan van de Wouw M. N. van den Heuvel Henk Nijmeijer J. A. van Rooij

In many industrial applications imbalance is a major cause for unwanted vibrations. One way to compensate for an unknown imbalance is the implementation of an automatic ball balancer. Oil-lubricated automatic ball balancers are applied in hand-held tools and washers. However, in applications such as optical drives fluid lubrication is highly undesirable since it may destroy the optical system u...

Journal: :The Journal of chemical physics 2016
Ravi Bhadauria N R Aluru

We propose a one-dimensional isothermal hydrodynamic transport model for non-reacting binary mixtures in slit shaped nanochannels. The coupled species momentum equations contain viscous dissipation and interspecies friction term of Maxwell-Stefan form. Species partial viscosity variations in the confinement are modeled using the van der Waals one fluid approximation and the local average densit...

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