Poiseuille flow to measure the viscosity of particle model fluids

Abstract

Poiseuille flow to measure the viscosity of particle model fluids.Backer, J.A.; Lowe, C.P.; Hoefsloot, H.C.J.; Iedema, P.D. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. The most important property of a fluid is its viscosity, it determines the flow properties. If one simulates a fluid using a particle model, calculating the viscosity accurately is difficult because it is a collective property. In this article we describe a new method that has a better signal to noise ratio than existing methods. It is based on using periodic boundary conditions to simulate counter-flowing Poiseuille flows without the use of explicit boundaries. The viscosity is then related to the mean flow velocity of the two flows. We apply the method to two quite different systems. First, a simple generic fluid model, dissipative particle dynamics, for which accurate values of the viscosity are needed to characterize the model fluid. Second, the more realistic Lennard-Jones fluid. In both cases the values we calculated are consistent with previous work but, for a given simulation time, they are more accurate than those obtained with other methods.

Sediment–Water Interface Flow with the Multiparticle Collision Dynamics

“…Stress undergoes standard linear increase in the Poiseuilleflow region. This is natural for channel flow and was observed before (Backer et al 2005). What is interesting here is the sudden change of its behaviour at the SWI (y/L = 0.5) where it starts to decrease nonlinearly.…”

Steady shear rheometry of dissipative particle dynamics models of polymer fluids in reverse Poiseuille flow

“…The application of RPF to complex fluids is novel, although it was first applied to measure the viscosity for particle models of Newtonian fluids. 1 The flow consists of two parallel Poiseuille flows driven by uniform body forces of equal magnitude but in opposite directions. Figure 1 shows the profiles of the imposed shear stress ͑b͒ and of the a͒ Electronic mail: gk@dam.brown.edu.…”

Multi-Particle Collision Dynamics: A Particle-Based Mesoscale Simulation Approach to the Hydrodynamics of Complex Fluids

“…Take DPD as an example: the viscosity measured in Ref. [29] is about 50% smaller than the value predicted theoretically in the same paper. For SRD, the agreement is generally better than 1%.…”