Flow Behavior of Polystyrene Systems in Steady Shearing Flow

1969 ◽  
Vol 2 (1) ◽  
pp. 49-57 ◽  
Author(s):  
William W. Graessley ◽  
Leon Segal
Keyword(s):  
Flow Behavior ◽  
Shearing Flow ◽  
Steady Shearing

Stochastic Aspects of Bridging Bonds of Induced Structure of Electro-Rheological Fluids in Shear Flow

1999 ◽  
Vol 13 (14n16) ◽  
pp. 1798-1805 ◽  
Author(s):  
P. Riha ◽  
H. Kimura ◽  
J. Takimoto ◽  
K. Koyama
Keyword(s):  
Flow Behavior ◽  
Electrorheological Fluid ◽  
Rheological Characteristics ◽  
Rheological Equation ◽  
Shearing Flow ◽  
Polymeric Blends ◽  
Start Up ◽  
Dominant Feature ◽  
Steady Shearing ◽  
Induced Structure

The bridging of electrodes by clusters of polarizable elements occurs to be a dominant feature of the response of certain electrorheological fluid suspensions and liquid polymeric blends to the imposed electric field. The evolution of the bridging structure in deformation and flow is described as a stochastic process and identified with the macroscopic flow behavior. The effect of structure is introduced into the rheological equation providing its non-linear modification. The comparisons are presented showing how the proposed rheological equation describes rheological characteristics measured at steady shearing flow and start-up shearing flow.

Non-Newtonian effects in steady motion of some idealized elastico-viscous liquids

1958 ◽  
Vol 245 (1241) ◽  
pp. 278-297 ◽  
Keyword(s):  
Steady Flow ◽  
Apparent Viscosity ◽  
Steady Motion ◽  
Shear Stresses ◽  
Normal Stresses ◽  
Straight Pipe ◽  
Shearing Flow ◽  
Viscous Liquids ◽  
Variable Shear ◽  
Steady Shearing

Normal-stress effects and the variation of apparent viscosity with rate of shear in simple types of steady flow of certain idealized elastico-viscous liquids are discussed. The liquids are those whose behaviour at sufficiently small variable shear stresses can be characterized by three constants (a coefficient of viscosity, a relaxation time and a retardation time) and whose invariant differential equations of state for general motion (involving eight independent physical constants) are linear in the stresses and include terms of no higher degree than the second in the stresses and velocity gradients together. The normal stresses which, in addition to shear stresses, are present in such a liquid in a state of simple shearing flow, or in flow in a circular pipe, or between rotating cylinders, are investigated; and the conditions under which the Weissenberg climbing effect will occur, in a positive or negative sense, are examined. In many liquids of this class, steady rectilinear flow under a uniform pressure gradient is not always possible in a straight pipe of arbitrary section, nor is steady flow in horizontal circles in a region bounded by arbitrary surfaces of revolution in relative rotation about common vertical axis. The behaviour of these idealized liquids when sheared in a narrow gap between a rotating wide-angled cone and a flat plate is compared with the observations of Roberts (1952, 1953) on some real elastico-viscous liquids. Certain liquids of this class, characterized by six independent constants satisfying certain inequalities, exhibit rheological behaviour which is, at least qualitatively, similar to the behaviour of many real elastico-viscous liquids in the following respects: the behaviour at small variable shear stresses, the variation of apparent viscosity with rate of steady shearing, the climbing effect up a vertical rod rotated in the liquid, and a distribution of normal stresses equivalent to an extra tension along the streamlines (with an isotropic state of stress in the plane normal to the streamlines) which is present in all the simple types of steady shearing flow investigated. These liquids can flow steadily in straight lines through a straight pipe of any section.

Experimental Analysis of the Slip Phenomenon of Sewage Sludge

2011 ◽  
Vol 243-249 ◽  
pp. 41-44
Author(s):  
Li Zhang ◽  
Min Quan Feng ◽  
Xiao Bin Zhang
Keyword(s):  
Water Content ◽  
Strain Amplitude ◽  
High Speed ◽  
Stress Amplitude ◽  
Wall Slip ◽  
Shearing Flow ◽  
Oscillatory Shear Flow ◽  
Straight Line ◽  
Strain Stress ◽  
Steady Shearing

Wall slip of sweage sludge and affect slip possible factors were studied experimentally by using a rotational rheometer with parallel plate fixtures and by means high speed camera. In the steady shearing flow, the technique involves placing a straight line marker monitoring of wall slip,checking the gap dependence of the stress/ strain data. For sweage sludge of water content 80%, in the shearing flow it was found that, as the strain amplitude increasing, the stress data obtained at different gaps, then, at the certain strain amplitude, started to diverge, indicating that wall slip occurred. But for sweage sludge of water content 90%, these curves are superimpose, indicating no slip occurred. In the dynamic oscillatory shear flow, we analyze the total wave. While strain, stress amplitude decreases with the time, while strain, the stress amplitude remains constant.

Steady shearing flow of a moderately entangled polyethylene liquid

2016 ◽  
Vol 60 (6) ◽  
pp. 1227-1244 ◽  
Author(s):  
M. H. Nafar Sefiddashti ◽  
B. J. Edwards ◽  
B. Khomami
Keyword(s):  
Shearing Flow ◽  
Steady Shearing

Theory of dilute electro-rheological fluids

1991 ◽  
Vol 434 (1891) ◽  
pp. 297-315 ◽  
Keyword(s):  
Electric Field ◽  
Transverse Electric ◽  
Spherical Particles ◽  
Dielectric Fluid ◽  
General Study ◽  
Shearing Flow ◽  
Strain Relationship ◽  
Dilute Suspension ◽  
Steady Shearing ◽  
The Relationship

The stress versus rate of strain relationship for a dilute suspension of conducting spherical particles in a dielectric fluid is worked out under conditions of simple steady shearing flow in a transverse electric field. The relationship is found to be nonlinear and multivalued so that under certain simple circumstances hysteresis and catastrophic changes in stress or strain rate can occur. The work is of interest in the general study of electro-rheological fluids.

Investigation on the control of multiphase flow behavior in a continuous casting tundish during ladle change

2020 ◽  
Vol 117 (6) ◽  
pp. 619
Author(s):  
Rui Xu ◽  
Haitao Ling ◽  
Haijun Wang ◽  
Lizhong Chang ◽  
Shengtao Qiu
Keyword(s):  
Multiphase Flow ◽  
Flow Behavior ◽  
Rolled Strip ◽  
Impact Zone ◽  
Steel Cleanliness ◽  
Carry Over ◽  
Slag Carry Over ◽  
Hot Rolled ◽  
Turbulence Inhibitor ◽  
The Impact

The transient multiphase flow behavior in a single-strand tundish during ladle change was studied using physical modeling. The water and silicon oil were employed to simulate the liquid steel and slag. The effect of the turbulence inhibitor on the slag entrainment and the steel exposure during ladle change were evaluated and discussed. The effect of the slag carry-over on the water-oil-air flow was also analyzed. For the original tundish, the top oil phase in the impact zone was continuously dragged into the tundish bath and opened during ladle change, forming an emulsification phenomenon. By decreasing the liquid velocities in the upper part of the impact zone, the turbulence inhibitor decreased considerably the amount of entrained slag and the steel exposure during ladle change, thereby eliminating the emulsification phenomenon. Furthermore, the use of the TI-2 effectively lowered the effect of the slag carry-over on the steel cleanliness by controlling the movement of slag droplets. The results from industrial trials indicated that the application of the TI-2 reduced considerably the number of linear inclusions caused by ladle change in hot-rolled strip coils.

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