Nonuniform flow in soft glasses of colloidal rods

2017 ◽  
Vol 2 (4) ◽  
Author(s):  
J. K. G. Dhont ◽  
K. Kang ◽  
H. Kriegs ◽  
O. Danko ◽  
J. Marakis ◽  
...  
Keyword(s):  
Nonuniform Flow ◽  
Soft Glasses ◽  
Colloidal Rods

Magnetic Manipulation and Assembly of Nonmagnetic Colloidal Rods in a Ferrofluid

Langmuir ◽  
2021 ◽  
Vol 37 (4) ◽  
pp. 1429-1437
Author(s):  
Shuo Wang ◽  
Yi Chen ◽  
Xuemao Zhou ◽  
Lijie Lei ◽  
Zameer Hussain Shah ◽  
...  
Keyword(s):  
Magnetic Manipulation ◽  
Colloidal Rods

Dune-scale cross-strata across the fluvial-deltaic backwater regime: Preservation potential of an autogenic stratigraphic signature

Geology ◽  
2020 ◽  
Vol 48 (12) ◽  
pp. 1144-1148
Author(s):  
Chenliang Wu ◽  
Jeffrey A. Nittrouer ◽  
Travis Swanson ◽  
Hongbo Ma ◽  
Eric Barefoot ◽  
...  
Keyword(s):  
Spatial Variability ◽  
Mississippi River ◽  
Nonuniform Flow ◽  
Hydrodynamic Conditions ◽  
Flow Conditions ◽  
Bed Topography ◽  
Fundamental Building Block ◽  
Bed Form ◽  
Spatially Varying ◽  
Topography Data

Abstract Dune-scale cross-beds are a fundamental building block of fluvial-deltaic stratigraphy and have been recognized on Earth and other terrestrial planets. The architecture of these stratal elements reflects bed-form dynamics that are dependent on river hydrodynamic conditions, and previous work has documented a multitude of scaling relationships to describe the morphodynamic interactions between dunes and fluid flow. However, these relationships are predicated on normal flow conditions for river systems and thus may be unsuitable for application in fluvial-deltaic settings that are impacted by nonuniform flow. The ways in which dune dimensions vary systematically due to the influence of reach-averaged, nonuniform flow, and how such changes may be encoded in dune cross-strata, have not been investigated. Herein, we explored the influence of backwater flow on dune geometry in a large modern fluvial channel and its implications for interpretation of systematic variability in dune cross-strata in outcrop-scale stratigraphy. This was accomplished by analyzing high-resolution channel-bed topography data for the lowermost 410 km of the Mississippi River, which revealed that dune size increases to a maximum before decreasing toward the river outlet. This spatial variability coincides with enhanced channel-bed aggradation and decreasing dune celerity, which arise due to backwater hydrodynamics. An analytical model of bed-form stratification, identifying spatial variability of cross-set thickness, indicates a prominent downstream decrease over the backwater region. These findings can be used to inform studies of ancient fluvial-deltaic settings, by bolstering assessments of proximity to the marine terminus and associated spatially varying paleohydraulics.

Experimental and Theoretical Analysis of Transient Response of Plate Heat Exchangers in Presence of Nonuniform Flow Distribution

2008 ◽  
Vol 130 (5) ◽  
Author(s):  
N. Srihari ◽  
Sarit K. Das
Keyword(s):  
Steady State ◽  
Heat Exchangers ◽  
Sudden Change ◽  
Temperature Response ◽  
Flow Distribution ◽  
Transient Temperature ◽  
Nonuniform Flow ◽  
Flow Rates ◽  
Plate Heat ◽  
Flow Maldistribution

Transient analysis helps us to predict the behavior of heat exchangers subjected to various operational disturbances due to sudden change in temperature or flow rates of the working fluids. The present experimental analysis deals with the effect of flow distribution on the transient temperature response for U-type and Z-type plate heat exchangers. The experiments have been carried out with uniform and nonuniform flow distributions for various flow rates. The temperature responses are analyzed for various transient characteristics, such as initial delay and time constant. It is also possible to observe the steady state characteristics after the responses reach asymptotic values. The experimental observations indicate that the Z-type flow configuration is more strongly affected by flow maldistribution compared to the U-type in both transient and steady state regimes. The comparison of the experimental results with numerical solution indicates that it is necessary to treat the flow maldistribution separately from axial thermal dispersion during modeling of plate heat exchanger dynamics.

Theoretical description of photochemical hole burning in soft glasses

1983 ◽  
Vol 99 (4) ◽  
pp. 331-334 ◽  
Author(s):  
Bret Jackson ◽  
Robert Silbey
Keyword(s):  
Theoretical Description ◽  
Hole Burning ◽  
Soft Glasses ◽  
Photochemical Hole Burning

scholarly journals Mode-coupling analysis of residual stresses in colloidal glasses

Soft Matter ◽  
2014 ◽  
Vol 10 (27) ◽  
pp. 4822-4832 ◽  
Author(s):  
S. Fritschi ◽  
M. Fuchs ◽  
Th. Voigtmann
Keyword(s):  
Glass Transition ◽  
Shear Flow ◽  
Residual Stresses ◽  
Mode Coupling ◽  
Nonlinear Response ◽  
Density Fluctuations ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Coupling Analysis ◽  
Soft Glasses

Soft glasses produced after the cessation of shear flow exhibit persistent residual stresses. Mode coupling theory of the glass transition explains their history dependence in terms of nonequilibrium, nonlinear-response relaxation of density fluctuations.

Spontaneous Formation of Stringlike Clusters and Smectic Sheets for Colloidal Rods Confined in Thin Wedgelike Gaps

Langmuir ◽  
2013 ◽  
Vol 29 (33) ◽  
pp. 10529-10538 ◽  
Author(s):  
Hideatsu Maeda ◽  
Yoshiko Maeda
Keyword(s):  
Spontaneous Formation ◽  
Colloidal Rods

The Unsteady Loading on a Marine Propeller in a Nonuniform Flow

1964 ◽  
Vol 8 (05) ◽  
pp. 29-38
Author(s):  
Michael D. Greenberg
Keyword(s):  
Free Stream ◽  
Marine Propeller ◽  
Nonuniform Flow ◽  
Surface Integral ◽  
Practical Applications ◽  
Vortex Model ◽  
Surface Integral Equation ◽  
Lifting Surface ◽  
Finite Wing ◽  
Unsteady Loading

The lifting-surface integral equation governing the unsteady loading on a marine propeller in a nonuniform free stream is derived using a classical vortex model. The induced downwash is split into a part corresponding to a locally tangent flat finite wing and wake, plus parts corresponding to the effects of the "helicoidal deviation" from this, of the true blade and wake, and the interference from the other blades and their wakes. Strip-type approximations are tolerated on these terms while a lifting-surface formulation is retained for the dominant finite flat-wing portion. A simple numerical example is carried out and these effects are indeed found to be quite small; so small, in fact, that it may suffice to retain only the flat finite-wing terms in practical applications.

A Note on the Secondary Vortex Caused by a Thin Foil in a Nonuniform Flow

1988 ◽  
Vol 32 (01) ◽  
pp. 80-81
Author(s):  
B. Yim
Keyword(s):  
Thin Foil ◽  
Uniform Flow ◽  
Secondary Vortex ◽  
Nonuniform Flow ◽  
Vortex Strength ◽  
Finite Span ◽  
Trailing Vortices

WHEN A finite span lifting wing is located in a uniform flow, trailing vortices are generated by the wing. It is well known from the Kelvin theorem that the trailing vortex strength is proportional to the spanwise slope of the bound vortex distribution. When the wing is located in a nonuniform flow, the problem becomes complex. Such flow has been dealt with by Vandry [1], 2 Karman and Tshen [2], Honda [8], and Smith [4]. It has been found that this flow has an extra trailing vortex created by the interaction between the nonuniform flow and the wing. This extra vortex is called the secondary vortex and has been studied extensively in connection with the theory of turbomachinery.

Sign in / Sign up

Export Citation Format

Share Document