Flame Spread Experiments in a Simulated Microgravity Flow Environment Using Laminar Planar Couette Flow

2012 ◽  
Author(s):  
Karen Hung ◽  
Fletcher Miller ◽  
Sandra Olson
Keyword(s):  
Couette Flow ◽  
Flame Spread ◽  
Simulated Microgravity ◽  
Flow Environment ◽  
Planar Couette Flow

scholarly journals Characterization of Effective Diffusion within Viscoelastic Fluids with Elastic Instabilities

Fluids ◽  
2022 ◽  
Vol 7 (1) ◽  
pp. 33
Author(s):  
Valerie Hietsch ◽  
Phil Ligrani ◽  
Mengying Su
Keyword(s):  
Diffusion Coefficient ◽  
Couette Flow ◽  
Effective Diffusion Coefficient ◽  
Effective Diffusion ◽  
Flow Shear ◽  
Shear Rates ◽  
Flow Environment ◽  
Disk Rotation ◽  
Elastic Instabilities ◽  
Fluorescein Dye

We considered effective diffusion, characterized by magnitudes of effective diffusion coefficients, in order to quantify mass transport due to the onset and development of elastic instabilities. Effective diffusion coefficient magnitudes were determined using different analytic approaches, as they were applied to tracked visualizations of fluorescein dye front variations, as circumferential advection was imposed upon a flow environment produced using a rotating Couette flow arrangement. Effective diffusion coefficient results were provided for a range of flow shear rates, which were produced using different Couette flow rotation speeds and two different flow environment fluid depths. To visualize the flow behavior within the rotating Couette flow environment, minute amounts of fluorescein dye were injected into the center of the flow container using a syringe pump. This dye was then redistributed within the flow by radial diffusion only when no disk rotation was used, and by radial diffusion and by circumferential advection when disk rotation was present. Associated effective diffusion coefficient values, for the latter arrangement, were compared to coefficients values with no disk rotation, which were due to molecular diffusion alone, in order to quantify enhancements due to elastic instabilities. Experiments were conducted using viscoelastic fluids, which were based on a 65% sucrose solution, with different polymer concentrations ranging from 0 ppm to 300 ppm. Associated Reynolds numbers based on the fluid depth and radially averaged maximum flow velocity ranged from 0.00 to 0.5. The resulting effective diffusion coefficient values for different flow shear rates and polymer concentrations quantified the onset of elastic instabilities, as well as significant and dramatic changes to local mass transport magnitudes, which are associated with the further development of elastic instabilities.

Influence of gravity on nonlinear transport in the planar Couette flow

1999 ◽  
Vol 11 (4) ◽  
pp. 893-904 ◽  
Author(s):  
Mohamed Tij ◽  
Vicente Garzó ◽  
Andrés Santos
Keyword(s):  
Couette Flow ◽  
Nonlinear Transport ◽  
Planar Couette Flow

A theorem on stability of a planar Couette flow

1989 ◽  
Vol 41 (11) ◽  
pp. 1328-1335
Author(s):  
V. M. Solopenko
Keyword(s):  
Couette Flow ◽  
Planar Couette Flow

Fluid n‐decane undergoing planar Couette flow

1992 ◽  
Vol 97 (10) ◽  
pp. 7687-7694 ◽  
Author(s):  
Paz Padilla ◽  
So/ren Toxvaerd
Keyword(s):  
Couette Flow ◽  
Planar Couette Flow

Planar Couette Flow in a Single Gas

2003 ◽  
pp. 213-270
Author(s):  
Vicente Garzó ◽  
Andrés Santos
Keyword(s):  
Couette Flow ◽  
Planar Couette Flow

scholarly journals Nonlinear Response to Steady and Oscillating Planar Couette Flow

1996 ◽  
Vol 18 (1-2) ◽  
pp. 59-74
Author(s):  
Annino L. Vaccarella ◽  
Gary P. Morriss
Keyword(s):  
Couette Flow ◽  
Nonlinear Response ◽  
Planar Couette Flow

Vorticity generation and conservation for two-dimensional interfaces and boundaries

2014 ◽  
Vol 758 ◽  
pp. 63-93 ◽  
Author(s):  
M. Brøns ◽  
M. C. Thompson ◽  
T. Leweke ◽  
K. Hourigan
Keyword(s):  
Free Surface ◽  
Circular Cylinder ◽  
Couette Flow ◽  
Poiseuille Flow ◽  
Vortex Sheet ◽  
Newtonian Fluids ◽  
Two Dimensional ◽  
Two Fluids ◽  
Vorticity Generation ◽  
Planar Couette Flow

AbstractThe generation, redistribution and, importantly, conservation of vorticity and circulation is studied for incompressible Newtonian fluids in planar and axisymmetric geometries. A generalised formulation of the vorticity at the interface between two fluids for both no-slip and stress-free conditions is presented. Illustrative examples are provided for planar Couette flow, Poiseuille flow, the spin-up of a circular cylinder, and a cylinder below a free surface. For the last example, it is shown that, although large imbalances between positive and negative vorticity appear in the wake, the balance is found in the vortex sheet representing the stress-free surface.

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