How does a polymer chain pass through a cylindrical pore under an elongational flow field?

Polymer ◽  
2015 ◽  
Vol 67 ◽  
pp. A1-A13 ◽  
Author(s):  
Lianwei Li ◽  
Qianjin Chen ◽  
Fan Jin ◽  
Chi Wu
Keyword(s):  
Flow Field ◽  
Polymer Chain ◽  
Elongational Flow ◽  
Cylindrical Pore ◽  
Pass Through

Nonaxisymmetric Flow in the Narrow Gap Between a Rotating and a Stationary Disk

1976 ◽  
Vol 98 (2) ◽  
pp. 217-223 ◽  
Author(s):  
M. Bein ◽  
A. Shavit ◽  
A. Solan
Keyword(s):  
Flow Field ◽  
Perturbation Technique ◽  
Fluid Pressure ◽  
Rotating Disk ◽  
Operating Conditions ◽  
Narrow Gap ◽  
Stationary Disk ◽  
Flow Maps ◽  
Pass Through ◽  
Rotary Vane Compressor

The flow between a rotating disk and a stationary disk, with nonaxisymmetric boundary conditions is studied. A flow field of this type exists in the narrow gap between the rotor and side plates of a rotary vane compressor. Fluid is admitted into the gap in the center of the disk for the purpose of sealing against leakage due to the nonaxisymmetric pressure distribution externally imposed on the disk circumference. The flow is solved analytically by a perturbation technique. Flow maps and pressure maps are obtained for various operating conditions. The effectiveness of the fluid seal is evaluated for these conditions by calculating the flow rates that pass through the gap. The flow field is simulated on a test apparatus and experimental verification is given to the analytical results. The results obtained indicate the possibility of appreciably reducing the leakage through the gap by a proper selection of the fluid pressure and the disk geometry.

Dynamics of a polymer chain in an elongational flow

2000 ◽  
Vol 61 (3) ◽  
pp. 2840-2847 ◽  
Author(s):  
T. Hofmann ◽  
R. Winkler ◽  
P. Reineker
Keyword(s):  
Polymer Chain ◽  
Elongational Flow

A comparison of thermal degradation kinetic mechanisms between elongational and shearing flow fields for nano-silica/IFR synergistic fire retardant polypropylene nanocomposites

2019 ◽  
Vol 9 (9) ◽  
pp. 1033-1042 ◽  
Author(s):  
Zheng-Huan Wu ◽  
Jun-Xin Guo ◽  
Qi-Xiang Fan ◽  
Quan Wang ◽  
Yu-Jun Cai ◽  
...  
Keyword(s):  
Flow Field ◽  
Fire Retardant ◽  
Elongational Flow ◽  
Nano Silica ◽  
Ozawa Method ◽  
Screw Extruder ◽  
Degradation Kinetic ◽  
Shearing Flow ◽  
Polypropylene Nanocomposites ◽  
Kinetic Mechanisms

In this work, the same formulations of Nano-Silica/intumescent fire retardant polypropylene nanocomposites were prepared via a novel vane extruder and a tri-screw extruder, which represented elongational flow field and shearing flow field, respectively. Not only the synergistic combustion mechanisms of Kissinger method and Flynn-Wall-Ozawa method were revealed, but also the combustion effect and efficiency were compared. Both two methods proved specimens that processed by TE exhibited higher thermal stability. The smaller aggregates of physical initial Nano-Silica, the better dispersivity of aggregates in specimens that processed by VE. Such property broke the compactness degree of char layer.

scholarly journals On the Equilibria of the Extended Nematic Polymers under Elongational Flow

2007 ◽  
Vol 2007 ◽  
pp. 1-15
Author(s):  
Hong Zhou ◽  
Lynda Wilson ◽  
Hongyun Wang
Keyword(s):  
Flow Field ◽  
Short Range ◽  
Elongational Flow ◽  
Dipole Interaction ◽  
Smoluchowski Equation ◽  
Equilibrium Solutions ◽  
Short Range Interaction ◽  
Range Interaction ◽  
Stable Equilibria ◽  
Nematic Polymers

We classify the equilibrium solutions of the Smoluchowski equation for dipolar (extended) rigid nematic polymers under imposed elongational flow. The Smoluchowski equation couples the Maier-Saupe short-range interaction, dipole-dipole interaction, and an external elongational flow. We show that all stable equilibria of rigid, dipolar rod dispersions under imposed uniaxial elongational flow field are axisymmetric. This finding of axisymmetry significantly simplifies any procedure of obtaining experimentally observable equilibria.

Flow-induced whisker orientation and viscosity for molten composite systems in a uniaxial elongational flow field

Polymer ◽  
1995 ◽  
Vol 36 (20) ◽  
pp. 3927-3933 ◽  
Author(s):  
Masatoshi Kobayashi ◽  
Tatuhiro Takahashi ◽  
Junichi Takimoto ◽  
Kiyohito Koyama
Keyword(s):  
Flow Field ◽  
Elongational Flow ◽  
Composite Systems

The crossed-beam correlation technique

1967 ◽  
Vol 28 (4) ◽  
pp. 705-717 ◽  
Author(s):  
M. J. Fisher ◽  
F. R. Krause
Keyword(s):  
Flow Field ◽  
Shear Layer ◽  
Experimental Technique ◽  
Correlation Technique ◽  
Hot Wire ◽  
Flow Properties ◽  
Entire Flow ◽  
Pass Through ◽  
Subsonic Jet ◽  
Good Agreement

This paper describes an experimental technique which allows estimates of local turbulent properties of a shear layer to be obtained without the necessity of inserting a probe into the flow field. The probe is replaced by two beams of radiation, which pass through the entire flow field in two mutually perpendicular directions. It is shown that, although each beam independently reflects only an integral of the flow properties along the entire path between the source and detector, the covariance between the two detected signals does yield local turbulent information.To verify the validity of the technique, experimental results are presented for the shear layer of a subsonic jet and are shown to be in good agreement with published hot-wire data.

A study on polymer blending microrheology: Part 5 deformation of purely elastic particles in an elongational flow field

1989 ◽  
Vol 29 (9) ◽  
pp. 593-599 ◽  
Author(s):  
C. Van Der Reijden ◽  
A. S. Van Heel ◽  
A. Sára ◽  
J. Schut
Keyword(s):  
Flow Field ◽  
Elongational Flow ◽  
Polymer Blending ◽  
Elastic Particles
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