Equilibrium configurations and capillary interactions of Janus dumbbells and spherocylinders at fluid–fluid interfaces

Soft Matter ◽  
2019 ◽  
Vol 15 (12) ◽  
pp. 2638-2647 ◽  
Author(s):  
Carmine Anzivino ◽  
Fuqiang Chang ◽  
Giuseppe Soligno ◽  
René van Roij ◽  
Willem K. Kegel ◽  
...  
Keyword(s):  
Numerical Method ◽  
Experimental Results ◽  
Janus Particles ◽  
Fluid Interfaces ◽  
Fluid Interface ◽  
Equilibrium Configurations ◽  
Capillary Interactions ◽  
Good Agreement

We numerically investigate the adsorption of a variety of Janus particles (dumbbells, elongated dumbbells and spherocylinders) at a fluid–fluid interface by using a numerical method that takes into account the interfacial deformations. We also experimentally synthesize micrometer–sized charged Janus dumbbells and let them adsorb at a water–decane interface. We find a good agreement between numerical and experimental results.

Capillary interactions between spherical Janus particles at liquid–fluid interfaces

Soft Matter ◽  
2013 ◽  
Vol 9 (13) ◽  
pp. 3640 ◽  
Author(s):  
Hossein Rezvantalab ◽  
Shahab Shojaei-Zadeh
Keyword(s):  
Janus Particles ◽  
Fluid Interfaces ◽  
Capillary Interactions

scholarly journals Numerical Method for Fuel Distribution Downstream of the Emulsifying Channel Injector

1985 ◽  
Author(s):  
Liu Bing ◽  
Wang Hong-Ji
Keyword(s):  
Differential Equation ◽  
Numerical Method ◽  
Calculation Model ◽  
Experimental Results ◽  
Two Dimensional ◽  
Physical Processes ◽  
Mixture Formation ◽  
Fuel Distribution ◽  
Good Agreement

Based upon experimental results, the physical processes of fuel-air mixture formation downstream of the emulsifying channel injector (ECI) have been studied and a calculation model for predicting fuel distribution downstream of ECI has been proposed in this paper. The two-dimensional differential equation of diffusion is solved by numerical method and the fuel distribution downstream of ECI is calculated. The calculated values are in good agreement with the experimental results.

scholarly journals AN INCLINED-PLATE WAVE GENERATOR

1978 ◽  
Vol 1 (16) ◽  
pp. 21
Author(s):  
Frederick Raichlen ◽  
Jiin-Jen Lee
Keyword(s):  
Numerical Method ◽  
Wave Length ◽  
Experimental Results ◽  
Length Ratio ◽  
Constant Depth ◽  
Inclined Plate ◽  
Plate Wave ◽  
Wave Generator ◽  
Good Agreement

A numerical method for determining the characteristics of waves generated by a hinged inclined-plate wave generator operating in a constant depth channel is discussed. The analysis is in reasonably good agreement with experimental results. The results indicate the sloping generator operating under certain conditions is completely inefficient, i.e., for a given stroke and depth-to-wave-length ratio, very small waves are produced; for other wave periods for the same conditions significantly larger waves are generated.

scholarly journals Chains of cubic colloids at fluid–fluid interfaces

Soft Matter ◽  
2021 ◽  
Author(s):  
Carmine Anzivino ◽  
Giuseppe Soligno ◽  
René van Roij ◽  
Marjolein Dijkstra
Keyword(s):  
Self Assembly ◽  
Fluid Interfaces ◽  
Assembly Process ◽  
Fluid Interface ◽  
Chain Formation ◽  
Capillary Interactions

Inspired by recent experimental observations of spontaneous chain formation of cubic particles adsorbed at a fluid–fluid interface, we theoretically investigate whether capillary interactions can be responsible for this self-assembly process.

The Use of Fluid-Fluid Interfaces to Predict the Behavior of Oil Recovery Processes

1964 ◽  
Vol 4 (02) ◽  
pp. 171-182 ◽  
Author(s):  
E.L. Dougherty ◽  
J.W. Sheldon
Keyword(s):  
Oil Recovery ◽  
Hot Water ◽  
Experimental Results ◽  
Water Flooding ◽  
Fluid Interfaces ◽  
Fluid Interface ◽  
Numerical Techniques ◽  
Sweep Efficiency ◽  
Miscible Fluids ◽  
Recovery Processes

Abstract Using the numerical techniques shown in this paper it is possible to compute the simultaneous dynamical behavior of multiple fluid-fluid interfaces in two dimensions. Hence, fluid-fluid interface models of several oil recovery processes can be constructed which allow prediction of the effect of fluid flow in two dimensions on the behavior of these processes while taking into account various physical effects, such as saturation gradients, phase changes and thermal stimulation. Techniques for constructing fluid-fluid interface approximations for several oil recovery processes are reviewed. The validity of these techniques is established by comparison to experimental results. The availability of a computer program for computing the behavior of multiple fluid-fluid interface problems makes the use of potentiometric models uneconomic. The results indicate the areal sweep efficiencies obtained from potentiometric model studies at high mobility ratios may be somewhat optimistic. The results also indicate that the areal sweep efficiency curves obtained at high viscosity ratios mu2/mu1 greater than 2–4 using miscible fluids in porous media are misleading and that considerable care must be taken in defining the mobility ratio for a displacement process, especially for miscible fluids. Introduction Many of the methods used to estimate areal sweep efficiency assume that the oil recovery process can be represented by one or more fluid-fluid interfaces. When the mobilities of the displaced and displacing phases are assumed equal, this quantity can be computed using analytical mathematical methods. For non-unit mobility ratio, experimental methods based upon the fluid-fluid interface concept include potentiometric and electrolytic blotter models. Scaled models of porous media have also been used to study this problem. Fay and Prats and Aronofsky used numerical techniques to compute breakthrough sweep efficiency, but neither of these studies were extended beyond breakthrough. Numerical techniques which have been developed for solving a general fluid-fluid interface problem are presented in a companion paper. These techniques have been incorporated into a program for a large-scale digital computer which can treat simultaneously the dynamical behavior of as many as six fluid-fluid interfaces. Thus it is possible to simulate the behavior of several oil recovery processes taking into account such effects as saturation gradients. Techniques for representing several oil recovery processes by fluid-fluid interfaces are presented. Processes considered are conventional water flooding with and without a mobile gas phase, hot water flooding, miscible flooding and enriched gas drive. Other processes, whose effects could he studied by this technique, but are not considered in detail here, are underground combustion and steam injection processes and various slug processes such as gas-water injection and alcohol-solvent processes. Theoretical results obtained with single interfaces for mobility ratios of 0.25, 1, 2, 4, 8, 16, 32 and 64 in a repeated five-spot are compared to experimental results for this geometrical configuration obtained using miscible fluids and conductive analogs. Predicted recovery curves for water flooding in a repeated five-spot are compared to experimental results reported in the literature. Example calculations are shown for a conventional water flood in the presence of a free gas phase and for a hot-water flood. MATHEMATICAL PRELIMINARIES We assume that the rock matrix is homogeneous with constant thickness, absolute permeability and porosity. The fluids are incompressible. We also neglect the effects of gravity. SPEJ P. 171ˆ

Flow Analysis in a Chip Cavity During Semiconductor Encapsulation

1999 ◽  
Vol 122 (2) ◽  
pp. 160-167 ◽  
Author(s):  
S. Han ◽  
K. K. Wang
Keyword(s):  
Numerical Method ◽  
Flow Analysis ◽  
Cross Flow ◽  
Experimental Results ◽  
Accurate Analysis ◽  
Molding Compound ◽  
Semiconductor Chip ◽  
Encapsulation Process ◽  
Flow Through ◽  
Good Agreement

In this paper, methods to analyze the flow during semiconductor chip encapsulation have been developed. A numerical method is used for the flow analysis in the chip cavity. In this study, for accurate analysis of flow in the chip cavity, models for the cross flow through the leadframe openings have been developed. The models have been verified by comparing with two experiments. In the first experiment, clear polymer and transparent mold have been used for the visualization of flow in a cavity with a leadframe. In the next experiment, actual epoxy molding compound together with an industrial encapsulation process have been used to observe the melt-front advancement shapes. The calculated and experimental results show good agreement. [S1043-7398(00)00902-6]

scholarly journals Tunable dipolar capillary deformations for magnetic Janus particles at fluid–fluid interfaces

Soft Matter ◽  
2015 ◽  
Vol 11 (18) ◽  
pp. 3581-3588 ◽  
Author(s):  
Qingguang Xie ◽  
Gary B. Davies ◽  
Florian Günther ◽  
Jens Harting
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Present Theory ◽  
Janus Particles ◽  
Fluid Interfaces ◽  
Capillary Interactions

We present theory and simulations describing the behaviour of magnetic Janus particles adsorbed at fluid–fluid interfaces interacting with an external magnetic field. We show that the particles deform the interface in a dipolar manner and suggest how to utilise capillary interactions to create novel, reconfigurable materials.

Inducing Frictional Force to Enhance the Transient Response in Beams

2019 ◽  
Vol 22 (2) ◽  
pp. 88-93
Author(s):  
Hamed Khanger Mina ◽  
Waleed K. Al-Ashtrai
Keyword(s):  
Numerical Analysis ◽  
Transient Response ◽  
Frictional Force ◽  
Damping Ratio ◽  
Experimental Results ◽  
Damping Capacity ◽  
Tightening Force ◽  
Contact Areas ◽  
Good Agreement ◽  
Ansys Workbench

This paper studies the effect of contact areas on the transient response of mechanical structures. Precisely, it investigates replacing the ordinary beam of a structure by two beams of half the thickness, which are joined by bolts. The response of these beams is controlled by adjusting the tightening of the connecting bolts and hence changing the magnitude of the induced frictional force between the two beams which affect the beams damping capacity. A cantilever of two beams joined together by bolts has been investigated numerically and experimentally. The numerical analysis was performed using ANSYS-Workbench version 17.2. A good agreement between the numerical and experimental results has been obtained. In general, results showed that the two beams vibrate independently when the bolts were loosed and the structure stiffness is about 20 N/m and the damping ratio is about 0.008. With increasing the bolts tightening, the stiffness and the damping ratio of the structure were also increased till they reach their maximum values when the tightening force equals to 8330 N, where the structure now has stiffness equals to 88 N/m and the damping ratio is about 0.062. Beyond this force value, increasing the bolts tightening has no effect on stiffness of the structure while the damping ratio is decreased until it returned to 0.008 when the bolts tightening becomes immense and the beams behave as one beam of double thickness.

PHOTOINDUCED NONLINEAR OCTUPOLAR POLARIZATION: TRANSIENT AND PERMANENT REGIMES

1996 ◽  
Vol 05 (04) ◽  
pp. 653-670 ◽  
Author(s):  
CÉLINE FIORINI ◽  
JEAN-MICHEL NUNZI ◽  
FABRICE CHARRA ◽  
IFOR D.W. SAMUEL ◽  
JOSEPH ZYSS
Keyword(s):  
Theoretical Analysis ◽  
Second Harmonic ◽  
Experimental Results ◽  
Polar Field ◽  
Rotational Spectrum ◽  
Dual Frequency ◽  
One Dimensional ◽  
Ethyl Violet ◽  
Disperse Red 1 ◽  
Good Agreement

An original poling method using purely optical means and based on a dual-frequency interference process is presented. We show that the coherent superposition of two beams at fundamental and second-harmonic frequencies results in a polar field with an irreducible rotational spectrum containing both a vector and an octupolar component. This enables the method to be applied even to molecules without a permanent dipole such as octupolar molecules. After a theoretical analysis of the process, we describe different experiments aiming at light-induced noncentrosymmetry performed respectively on one-dimensional Disperse Red 1 and octupolar Ethyl Violet molecules. Macroscopic octupolar patterning of the induced order is demonstrated in both transient and permanent regimes. Experimental results show good agreement with theory.

scholarly journals Comparison of Experimental and Numerical Transient Drop Deformation during Transition through Orifices in High-Pressure Homogenizers

2021 ◽  
Vol 5 (3) ◽  
pp. 32
Author(s):  
Benedikt Mutsch ◽  
Peter Walzel ◽  
Christian J. Kähler
Keyword(s):  
High Pressure ◽  
Visual Analysis ◽  
Imaging Technique ◽  
Extensional Flow ◽  
Droplet Breakup ◽  
Experimental Results ◽  
Drop Deformation ◽  
Droplet Deformation ◽  
Shadow Imaging ◽  
Good Agreement

The droplet deformation in dispersing units of high-pressure homogenizers (HPH) is examined experimentally and numerically. Due to the small size of common homogenizer nozzles, the visual analysis of the transient droplet generation is usually not possible. Therefore, a scaled setup was used. The droplet deformation was determined quantitatively by using a shadow imaging technique. It is shown that the influence of transient stresses on the droplets caused by laminar extensional flow upstream the orifice is highly relevant for the droplet breakup behind the nozzle. Classical approaches based on an equilibrium assumption on the other side are not adequate to explain the observed droplet distributions. Based on the experimental results, a relationship from the literature with numerical simulations adopting different models are used to determine the transient droplet deformation during transition through orifices. It is shown that numerical and experimental results are in fairly good agreement at limited settings. It can be concluded that a scaled apparatus is well suited to estimate the transient droplet formation up to the outlet of the orifice.

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