Interfacial-fluid dynamics and the mixing efficiency of turbulent flows

2004 ◽  
Vol 16 (12) ◽  
pp. 4746-4749 ◽  
Author(s):  
Haris J. Catrakis ◽  
Roberto C. Aguirre
Keyword(s):  
Fluid Dynamics ◽  
Turbulent Flows ◽  
Mixing Efficiency ◽  
Interfacial Fluid ◽  
Interfacial Fluid Dynamics

scholarly journals Tension grips the flow

2018 ◽  
Vol 846 ◽  
pp. 1-4
Author(s):  
M. M. Bandi
Keyword(s):  
Physical Chemistry ◽  
Fluid Dynamics ◽  
Surface Tension ◽  
Soap Solution ◽  
Dominant Role ◽  
Soap Film ◽  
Elastic Membrane ◽  
Two Dimensional ◽  
Interfacial Fluid ◽  
Interfacial Fluid Dynamics

Surface tension plays a dominant role in the formation and stability of soap films. It renders them both a quasi-two-dimensional fluid and an elastic membrane at the same time. The techniques for measuring the surface tension of the soap solution may very well apply to the static soap film, but how can the surface tension of a soap film be unintrusively measured, and what value would it assume? The answer, being at the intersection of physical chemistry, non-equilibrium physics and interfacial fluid dynamics, is not amenable to deduction via established methods. In a joint theoretical and experimental study, Sane et al. (J. Fluid Mech., vol. 841, 2018, R2) exploit elasticity theory to glean the answer through a simple, yet elegant framework.

1507 Development of Selective Gas-Permeable Device Controlled by Micro Gas-Liquid Interfacial Fluid Dynamics

2009 ◽  
Vol 2009 (0) ◽  
pp. 475-476
Author(s):  
Yuriko SENGA ◽  
Yasuhiro KAKINUMA ◽  
Atsushi HOTTA ◽  
Yohei SATO ◽  
Koichi HISHIDA
Keyword(s):  
Fluid Dynamics ◽  
Interfacial Fluid ◽  
Interfacial Fluid Dynamics

Coupled CFD-DEM modelling to assess settlement velocity and drag coefficient of microplastics

2020 ◽  
Author(s):  
Robin Jérémy ◽  
Latessa Pablo Gaston ◽  
Manousos Valyrakis
Keyword(s):  
Fluid Dynamics ◽  
Fresh Water ◽  
Turbulent Flows ◽  
Transport Processes ◽  
Water Bodies ◽  
World Health ◽  
Drinking Water Source ◽  
Drag Coefficients ◽  
Wide Range ◽  
The Impact

<p>Several studies have documented high concentration of microplastics on fresh water sources, oceans and even on treated tap and bottled water. Understanding the physics behind these particles in the water environment has become one of the key research needs identified in the World Health Organization Report (2019). In order to develop novel and efficient methodologies for sampling, treating and removing microplastics from water bodies, a thorough understanding of the sources and transportation and storage mechanisms of these particles is required.</p><p>In this article, the settlement velocity affecting the transport [1, 2] of low-density particles (1<r<1.4 g.cm<sup>-3</sup>) and drag coefficients is assessed through numerical modelling. The effects of fluid and particle relative densities and media temperatures are analysed, as well as the impact of the particle size and shapes [3].</p><p>Computational Fluid Dynamics (CFD) techniques are applied to solve the fluid dynamics while the Discrete Element Method (DEM) approach is used to model the particle trajectories [4]. These two modules are coupled under the CFDEM module, which transmits the forces from the fluid into the particle and from the particle into the surrounding water through the Fictitious Boundary Method approach.</p><p>Several tests are run under the same particle conditions in order to estimate the influence of turbulent flows on these experiments. The influence from different particle densities and diameters on settling velocities and drag coefficients is assessed. The numerical results are validated against a wide range of experimental data [2, 3] and compared against empirical predictions.</p><p>There is an urge for gaining a better understanding of the sources and transport of microplastics through fresh water bodies. In this sense, sampling and quantification of microplastics in a drinking water source is key to evaluate the environment status and to design the most appropriate techniques to reduce or remove the microplastics from the aquatic environments. The implementation of coupled CFD-DEM models provides a very powerful tool for the understanding and prediction of the transport processes and the accumulation of microplastics along the fluvial vectors.</p><p> </p><p>References</p><p>[1] Valyrakis M., Diplas P. and Dancey C.L. 2013. Entrainment of coarse particles in turbulent flows: An energy approach. J. Geophys. Res. Earth Surf., Vol. 118, No. 1., pp 42- 53, doi:340210.1029/2012JF002354.</p><p>[2] Valyrakis, M., Farhadi, H. 2017. Investigating coarse sediment particles transport using PTV and “smart-pebbles” instrumented with inertial sensors, EGU General Assembly 2017, Vienna, Austria, 23-28 April 2017, id. 9980.</p><p>[3] Valyrakis, M., J. Kh. Al-Hinai, D. Liu (2018), Transport of floating plastics along a channel with a vegetated riverbank, 12th International Symposium on Ecohydraulics, Tokyo, Japan, August 19-24, 2018, a11_2705647.</p><p>[4] Valyrakis M., P. Diplas, C.L. Dancey, and A.O. Celik. 2008. Investigation of evolution of gravel river bed microforms using a simplified Discrete Particle Model, International Conference on Fluvial Hydraulics River Flow 2008, Ismir, Turkey, 03-05 September 2008, 10p.</p>

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