Nonlinear Sciences – Chaotic Dynamics
Scientific paper
2004-01-07
New Journal of Physics (NJP) 6, 29 (2004)
Nonlinear Sciences
Chaotic Dynamics
23 pages, 26 figures
Scientific paper
10.1088/1367-2630/6/1/029
Following our first report (A. Groisman and V. Steinberg, $\sl Nature$ $\bf 405$, 53 (2000)) we present an extended account of experimental observations of elasticity induced turbulence in three different systems: a swirling flow between two plates, a Couette-Taylor (CT) flow between two cylinders, and a flow in a curvilinear channel (Dean flow). All three set-ups had high ratio of width of the region available for flow to radius of curvature of the streamlines. The experiments were carried out with dilute solutions of high molecular weight polyacrylamide in concentrated sugar syrups. High polymer relaxation time and solution viscosity ensured prevalence of non-linear elastic effects over inertial non-linearity, and development of purely elastic instabilities at low Reynolds number (Re) in all three flows. Above the elastic instability threshold, flows in all three systems exhibit features of developed turbulence. Those include: (i)randomly fluctuating fluid motion excited in a broad range of spatial and temporal scales; (ii) significant increase in the rates of momentum and mass transfer (compared to those expected for a steady flow with a smooth velocity profile). Phenomenology, driving mechanisms, and parameter dependence of the elastic turbulence are compared with those of the conventional high Re hydrodynamic turbulence in Newtonian fluids.
Groisman Alexander
Steinberg Victor
No associations
LandOfFree
Elastic turbulence in curvilinear flows of polymer solutions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Elastic turbulence in curvilinear flows of polymer solutions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Elastic turbulence in curvilinear flows of polymer solutions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-114376