Analysis of rheological behaviors of two-dimensional emulsion globules with asymmetric internal structures in modest extensional flows

2019 ◽  
Vol 31 (4) ◽  
pp. 042003 ◽  
Author(s):  
Qingbei Liu ◽  
Shen Xu ◽  
Zhijian Chen ◽  
Jingtao Wang
Keyword(s):  
Two Dimensional ◽  
Rheological Behaviors ◽  
Internal Structures ◽  
Extensional Flows

Two Dimensional Monte Carlo Simulations of Aggregation Phenomena in Ferromagnetic Colloidal Dispersions Composed of Rod-Like Hematite Particles

2007 ◽  
Author(s):  
Yuta Katayama ◽  
Ryo Hayasaka ◽  
Akira Satoh
Keyword(s):  
Monte Carlo ◽  
Magnetic Moment ◽  
Pair Correlation ◽  
Colloidal Dispersions ◽  
Magnetic Interactions ◽  
Particle Interactions ◽  
Two Dimensional ◽  
Internal Structures ◽  
The Magnetic Field ◽  
Aggregation Phenomena

We have investigated aggregation phenomena of ferromagnetic colloidal dispersions composed of rod-like hematite particles which have a magnetic moment normal to the particle axis, by means of the cluster-moving Monte Carlo method. In concrete, we have treated a two-dimensional dispersion in order to clarify the influences of the particle aspect ratio, magnetic interactions between particles, and the magnetic field strength on particle aggregations. Internal structures of particle aggregates have been discussed quantitatively in terms of radial distribution, pair correlation, orientational pair correlation functions, and number distributions of clusters. The results obtained here are summarized as follows. Rod-like particles tend to aggregate to form raft-like clusters more significantly along the magnetic moment direction as magnetic particle-particle interactions increase. However, such raft-like clusters do not aggregate further to form thicker clusters, which is in significantly contrast to dispersions of spherical or rod-like particles with a magnetic moment along the particle axis.

NMR imaging of fluids in porous solids

1990 ◽  
Vol 333 (1632) ◽  
pp. 441-452 ◽  
Keyword(s):  
Correlation Functions ◽  
Spin Echo ◽  
Three Dimensional ◽  
Porous Solids ◽  
Nmr Imaging ◽  
Two Dimensional ◽  
Related Property ◽  
Reservoir Rocks ◽  
Hydrocarbon Reservoir ◽  
Internal Structures

The principles governing the NMR behaviour of 1 H-containing fluids permeating porous solids, such as hydrocarbon reservoir rocks, are outlined. The additional capabilities of NMR imaging methods for characterizing these systems is considered. Experimental results are presented for NMR imaging applied to a model porous solid (alumina) and natural sandstone and limestone rocks, saturated with aqueous phases. Both three-dimensional and slice-selected two-dimensional FT spin echo methods are used and the images demonstrate the capability of NMRI in these systems to reveal internal structures of the porous solids. Simple strategies for characterizing the spatial heterogeneity of these materials in terms of histograms and correlation functions are proposed and a general pixel fitting program is used to examine some of the data in terms of such histograms and related property maps.

Internal structures in two-dimensional ferrofluids

2007 ◽  
Vol 76 (6) ◽  
Author(s):  
A. Yu. Zubarev ◽  
L. Yu. Iskakova
Keyword(s):  
Two Dimensional ◽  
Internal Structures

Deformation of a two-dimensional drop at non-zero Reynolds number in time-periodic extensional flows: numerical simulation

2001 ◽  
Vol 436 ◽  
pp. 177-206 ◽  
Author(s):  
KAUSIK SARKAR ◽  
WILLIAM R. SCHOWALTER
Keyword(s):  
Reynolds Number ◽  
Interfacial Tension ◽  
Vortex Flow ◽  
Extensional Flow ◽  
Reynolds Numbers ◽  
Time Dependent ◽  
Drop Deformation ◽  
Two Dimensional ◽  
Extensional Flows ◽  
Potential Vortex

The shape of a two-dimensional viscous drop deforming in several time-dependent flow fields, including that due to a potential vortex, has been studied. Vortex flow was approximated by linearizing the induced velocity field at the drop centre, giving rise to an extensional flow with rotating axes of stretching. A generalization of the potential vortex, a flow we have called rotating extensional flow, occurs when the frequency of revolution of the flow is varied independently of the shear rate. Drops subjected to this forcing flow exhibit an interesting resonance phenomenon. Finally we have studied drop deformation in an oscillatory extensional flow.Calculations were performed at small but non-zero Reynolds numbers using an ADI front-tracking/finite difference method. We investigate the effects of interfacial tension, periodicity, viscosity ratio, and Reynolds number on the drop dynamics. The simulation reveals interesting behaviour for steady stretching flows, as well as time-dependent flows. For a steady extensional flow, the drop deformation is found to be non-monotonic with time in its approach to an equilibrium value. At sufficiently high Reynolds numbers, the drop experiences multiple growth–collapse cycles, with possible axes reversal, before reaching a final shape. For a vortex flow, the long-time deformation reaches a steady value, and the drop attains a revolving steady elliptic shape. For rotating extensional flows as well as oscillatory extensional flows, the maximum value of deformation displays resonance with variation in parameters, first increasing and then decreasing with increasing interfacial tension or forcing frequency. A simple ODE model with proper forcing is offered to explain the observed phenomena.

scholarly journals Рентгеновские компьютерные методы исследований структурной целостности семян и их значение в современном семеноведении

2019 ◽  
Vol 89 (4) ◽  
pp. 627
Author(s):  
М.В. Архипов ◽  
Н.С. Прияткин ◽  
Л.П. Гусакова ◽  
Н.Н. Потрахов ◽  
А.Ю. Грязнов ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Computer Processing ◽  
Two Dimensional ◽  
X Ray ◽  
Computer Methods ◽  
Internal Structures

AbstractX-ray computer methods of research (projection microfocus radiography and microtomography), which are used to study the problem of hidden defects of seeds and investigate its impact on sowing quality, have been considered. The description and main characteristics of technical means that were used to obtain digital two-dimensional and three-dimensional (tomographic) X-ray images of seeds have been given and the possible ways of their quantitative computer processing and analysis have been discussed. Conclusions about the abilities of the methods of projection microfocus radiography and microtomography to study the features of the internal structures of a seed that are related to the violation of its integrity have been formulated.

Spectrophotometric measurements of objective-prism spectra

1966 ◽  
Vol 24 ◽  
pp. 118-119
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Progress Report ◽  
Two Dimensional ◽  
Objective Prism ◽  
Made In

I should like to give you a very condensed progress report on some spectrophotometric measurements of objective-prism spectra made in collaboration with H. Leicher at Bonn. The procedure used is almost completely automatic. The measurements are made with the help of a semi-automatic fully digitized registering microphotometer constructed by Hög-Hamburg. The reductions are carried out with the aid of a number of interconnected programmes written for the computer IBM 7090, beginning with the output of the photometer in the form of punched cards and ending with the printing-out of the final two-dimensional classifications.

Introductory paper

1966 ◽  
Vol 24 ◽  
pp. 3-5
Author(s):  
W. W. Morgan
Keyword(s):  
Line Intensity ◽  
Classification Scheme ◽  
Two Dimensional ◽  
Spectral Classification ◽  
Dimensional Array ◽  
Rr Lyrae ◽  
Metallic Line ◽  
Introductory Paper ◽  
Parameter Varying ◽  
Definition Of

1. The definition of “normal” stars in spectral classification changes with time; at the time of the publication of theYerkes Spectral Atlasthe term “normal” was applied to stars whose spectra could be fitted smoothly into a two-dimensional array. Thus, at that time, weak-lined spectra (RR Lyrae and HD 140283) would have been considered peculiar. At the present time we would tend to classify such spectra as “normal”—in a more complicated classification scheme which would have a parameter varying with metallic-line intensity within a specific spectral subdivision.

A one-dimensional self-gravitating stellar gas

1966 ◽  
Vol 25 ◽  
pp. 46-48 ◽  
Author(s):  
M. Lecar
Keyword(s):  
Gravitational Field ◽  
Phase Space ◽  
Motion Picture ◽  
Space Distribution ◽  
Two Dimensional ◽  
One Dimensional ◽  
Phase Space Distribution ◽  
Dimensional Phase Space ◽  
The Mean

“Dynamical mixing”, i.e. relaxation of a stellar phase space distribution through interaction with the mean gravitational field, is numerically investigated for a one-dimensional self-gravitating stellar gas. Qualitative results are presented in the form of a motion picture of the flow of phase points (representing homogeneous slabs of stars) in two-dimensional phase space.

Sign in / Sign up

Export Citation Format

Share Document