Special issue on finite-size particles, drops and bubbles in fluid flows: advances in modelling and simulations

Abstract

Multiphase flows laden with finite-size particles, droplets and bubbles are of fundamental importance in a huge variety of practical applications embracing environmental phenomena as well as industrial processes [3]. Over the last decade, modelling and simulation of such flows have become feasible thanks to the increase in computational power, and the subject has received growing attention within the multiphase flow community. This is proven by the appearance of dedicated sessions in all major international scientific events dedicated to multiphase flows. Among those organised in the last 5 years, and limiting the list to specialised events, we can cite Euromech colloquia (in particular the Colloquium 555 on Small-scale numerical methods for multiphase flows,

Using deformable particles for single-particle measurements of velocity gradient tensors

“…The deformation of structures by fluid flows plays a central role in many environmental, biological, and engineering situations and so has long been a focus of research [1,10,13,17,22,24,27]. Recently, the ability to measure and simulate the rotations [29] and deformations [3,9,11,23] of small particles advected in turbulent flows has provided substantial new insights about particle-turbulence interactions as well as the structure of turbulence itself.…”

Particle-Turbulence Interactions

“…The dynamics and orientation of fibers and rod-shaped particles are relevant to environmental flows such as cloud physics (Pinsky and Khain, 1998;Saunders, 1994;Saunders et al, 2001;Sherwood et al, 2006) and industrial flows from paper manufacturing (Lundell et al, 2011;Olson and Kerekes, 1998) to drag reduction using fiber suspensions (Dimitropoulos et al, 2005;Paschkewitz et al, 2005). In addition to advection and particle orientation, particle deformations are also an important factor in real-life particle-flow interactions and play a key role in many different flow environments (Ezzeldin et al, 2015;Guo et al, 2017;Marchioli and Vincent, 2019;Stockie and Green, 1998). Recent advances in experimental techniques and computational capabilities have allowed us to study the advection (Voth and Soldati, 2017) and deformation (Allende et al, 2018;Dotto and Marchioli, 2019;Gay et al, 2018;Rosti et al, 2018) of particles in fluid flows which have led to a deeper understanding of particle-turbulence interactions.…”

“…The deformation of structures by fluid flows plays a central role in many environmental, biological, and engineering situations and so has long been a focus of research (Al-Chapter 3 -Using deformable particles for single particle measurements of velocity gradient tensors 42 ben et al, 2002;Ezzeldin et al, 2015;Guo et al, 2017;Marchioli and Vincent, 2019;Qian et al, 2008;Rosti et al, 2019;Stockie and Green, 1998). Recently, the ability to measure and simulate the rotations (Voth and Soldati, 2017) and deformations (Allende et al, 2018;Dotto and Marchioli, 2019;Gay et al, 2018;Rosti et al, 2018) of small particles advected in turbulent flows has provided substantial new insights about particle-turbulence interactions as well as the structure of turbulence itself.…”