Scalable single-step microfluidic production of single-core double emulsions with ultra-thin shells

Lab on a Chip ◽  
2015 ◽  
Vol 15 (16) ◽  
pp. 3335-3340 ◽  
Author(s):  
L. R. Arriaga ◽  
E. Amstad ◽  
D. A. Weitz
Keyword(s):  
Thin Shell ◽  
Single Step ◽  
Thin Shells ◽  
Double Emulsions ◽  
Drop Radius ◽  
Microfluidic Technique

We report a scalable single-step microfluidic technique for the production of monodisperse double emulsions with very thin shell thicknesses, of about 5% of the drop radius.

On the Dynamic Stability of Fluid-Conveying Pipes

1973 ◽  
Vol 40 (1) ◽  
pp. 48-52 ◽  
Author(s):  
D. S. Weaver ◽  
T. E. Unny
Keyword(s):  
Potential Theory ◽  
Dynamic Stability ◽  
Thin Shell ◽  
Critical Flow ◽  
Thin Shells ◽  
Classical Potential ◽  
Classical Potential Theory ◽  
Limiting Case ◽  
Beam Mode ◽  
Fluid Conveying Pipes

This paper presents a general analysis of the dynamic stability of a finite-length, fluid-conveying pipe. The Flu¨gge-Kempner equation is used in conjunction with classical potential theory so that circumferential modes as well as the usual beam modes may be considered. The cylinders are found to become unstable statically at first but flutter is predicted for higher velocities. The critical flow velocities for short, thin shells are associated with a number of circumferential waves. This number reduces for thicker and longer shells until the instability is in a beam mode. When the limiting case of a long thin shell is taken, it is found to agree with previous results obtained using a simpler beam approach.

scholarly journals Prediction and control of drop formation modes in microfluidic generation of double emulsions by single-step emulsification

2017 ◽  
Vol 505 ◽  
pp. 315-324 ◽  
Author(s):  
Seyed Ali Nabavi ◽  
Goran T. Vladisavljević ◽  
Monalie V. Bandulasena ◽  
Omid Arjmandi-Tash ◽  
Vasilije Manović
Keyword(s):  
Single Step ◽  
Drop Formation ◽  
Double Emulsions ◽  
Prediction And Control ◽  
And Control

ON THE DYNAMICS OF A CLASS OF EINSTEIN–VLASOV SHELLS

2011 ◽  
Vol 20 (05) ◽  
pp. 661-674
Author(s):  
REINALDO J. GLEISER ◽  
MARCOS A. RAMIREZ
Keyword(s):  
Angular Momentum ◽  
Thin Shell ◽  
Continuous Distribution ◽  
Related Result ◽  
Thin Shells ◽  
Spherically Symmetric ◽  
Vlasov Equations ◽  
Finite Set ◽  
Thick Shells ◽  
Symmetric Systems

The Einstein–Vlasov equations govern the dynamics of systems of self-gravitating collisionless particles in the framework of general relativity. Here we review some recent results obtained by restricting to spherically symmetric systems and imposing the simplifying restrictions that the conserved angular momentum of the particles can take values only on a discrete, finite set. The first set of results is restricted to the existence of thin shells, their dynamics and stability. A second set is concerned with the existence of thick shells satisfying the same restrictions and the conditions under which they admit, in general, a thin shell limit. In a related result it is shown that the so called Einstein shells have a unique thin shell limit where the particle's angular momentum has a continuous distribution.

scholarly journals Geometric characteristics of the deformation state of the shells with orthogonal coordinate system of the middle surfaces

2020 ◽  
Vol 16 (1) ◽  
pp. 38-44
Author(s):  
Vyacheslav N. Ivanov ◽  
Alisa A. Shmeleva
Keyword(s):  
Differential Geometry ◽  
Coordinate System ◽  
Thin Shell ◽  
Tensor Analysis ◽  
Vector Analysis ◽  
Thin Shells ◽  
Orthogonal Coordinate System ◽  
Deformation State ◽  
The Common ◽  
To Receive

The aim of this work is to receive the geometrical equations of strains of shells at the common orthogonal not conjugated coordinate system. At the most articles, textbooks and monographs on the theory and analysis of the thin shell there are considered the shells the coordinate system of which is given at the lines of main curvatures. Derivation of the geometric equations of the deformed state of the thin shells in the lines of main curvatures is given, specifically, at monographs of the theory of the thin shells of V.V. Novozhilov, K.F. Chernih, A.P. Filin and other Russian and foreign scientists. The standard methods of mathematic analyses, vector analysis and differential geometry are used to receive them. The method of tensor analysis is used for receiving the common equations of deformation of non orthogonal coordinate system of the middle shell surface of thin shell. The equations of deformation of the shells in common orthogonal coordinate system (not in the lines of main curvatures) are received on the base of this equation. Derivation of the geometric equations of deformations of thin shells in orthogonal not conjugated coordinate system on the base of differential geometry and vector analysis (without using of tensor analysis) is given at the article. This access may be used at textbooks as far as at most technical institutes the base of tensor analysis is not given.

A Nondestructive Differential-Pressure Test for Thin Shells

1953 ◽  
Vol 20 (1) ◽  
pp. 48-52
Author(s):  
J. C. New
Keyword(s):  
Thin Shell ◽  
Salient Feature ◽  
External Pressure ◽  
Differential Pressure ◽  
Thin Shells ◽  
Pressure Test ◽  
Shell Design ◽  
Mechanical Factors ◽  
The Difference ◽  
Internal Volume

Abstract The differential-pressure test is an original, nondestructive, experimental technique for determining incipient buckling pressures of thin shells subjected to external pressure. Extensions of the basic test permit study of many buckling parameters as well as other mechanical factors in thin-shell design and evaluation. The salient feature of the technique is the filling of the internal volume of the shell with a compressible fluid, such as water, to control the magnitude and rate of shell deformation. The incipient buckling pressure is detected by noting the point at which the difference in internal and external pressure becomes constant. Experimental verification of the technique and its nondestructive aspect is presented. Applications and limitations of the test are discussed.

Thin Shell Concrete Structures of Félix Candela and Max Borges Jr.

2020 ◽  
Vol 61 (1) ◽  
pp. 51-58
Author(s):  
Maria E. Moreyra Garlock ◽  
Branko Glisic
Keyword(s):  
Mexico City ◽  
Thin Shell ◽  
Concrete Structures ◽  
Thin Shells ◽  
Hyperbolic Paraboloid ◽  
Construction Company ◽  
International Reputation ◽  
Felix Candela ◽  
First Time ◽  
Design And Construction

Max Borges Jr. (1918 – 2009) was an architect of thin shell concrete structures in Cuba in the 1950's. During this time, Félix Candela (1910 – 1997) owned a construction company that was dedicated to the design and construction of thin shells. Candela also owned an international reputation as a designer of thin shells in the hyperbolic paraboloid (hypar) form. The two men worked together for the first time on a project in Mexico City in 1954, and since then collaborated on several more, most of them in Cuba. This paper illustrates the architect – engineer relationship between Borges and Candela and documents the collaborative projects between them. The research grew out of a course co-taught by the authors, where the course was inspired by the style of teaching of David Billington (1927 – 2018) that integrates engineering with the humanities. Billington believed in scholarship based on historical studies and documentation of heritage structures. This paper is in tribute to this great man who continues to inspire.

Single step emulsification for the generation of multi-component double emulsions

Soft Matter ◽  
2012 ◽  
Vol 8 (41) ◽  
pp. 10719 ◽  
Author(s):  
L. L. A. Adams ◽  
Thomas E. Kodger ◽  
Shin-Hyun Kim ◽  
Ho Cheng Shum ◽  
Thomas Franke ◽  
...  
Keyword(s):  
Single Step ◽  
Double Emulsions

scholarly journals Thermodynamical and dynamical stability of a self-gravitating uncharged thin shell

2020 ◽  
Vol 80 (8) ◽  
Author(s):  
Santiago Esteban Perez Bergliaffa ◽  
Marcelo Chiapparini ◽  
Luz Marina Reyes
Keyword(s):  
Equation Of State ◽  
Energy Density ◽  
Thin Shell ◽  
Dynamical Stability ◽  
Thin Shells ◽  
Maximum Mass ◽  
Equilibrium Configurations

Abstract The dynamical stability of massive thin shells with a given equation of state (EOS) (both for the barotropic and non-barotropic case) is here compared with the results coming from thermodynamical stability. Our results show that the restrictions in the para-meter space of equilibrium configurations of the shell following from thermodynamical stability are much more stringent that those obtained from dynamical stability. As a byproduct, we furnish evidence that the link between the maximum mass along a sequence of equilibrium configurations and the onset of dynamical stability is valid for EOS relating the pressure P, the energy density $$\sigma $$σ of the matter on the shell, and its radius R, namely $$P=P(R, \sigma )$$P=P(R,σ).

scholarly journals Thin-shells and thin-shell wormholes in new massive gravity

2019 ◽  
Vol 79 (6) ◽  
Author(s):  
S. Danial Forghani ◽  
S. Habib Mazharimousavi ◽  
M. Halilsoy
Keyword(s):  
Thin Shell ◽  
Massive Gravity ◽  
Thin Shells ◽  
Thin Shell Wormholes

Secondary Creep of a Cylindrical thin Shell Subject to Axisymmetric Loading

1966 ◽  
Vol 8 (2) ◽  
pp. 215-225 ◽  
Author(s):  
T. P. Byrne ◽  
A. C. Mackenzie
Keyword(s):  
Thin Shell ◽  
Surface Deformation ◽  
Middle Surface ◽  
Thin Shells ◽  
Secondary Creep ◽  
Axisymmetric Loading ◽  
Linear Elastic ◽  
Stress Resultant ◽  
Radial Loading ◽  
Long Cylinder

A method is presented for the solution of boundary value problems in the secondary creep of circular cylindrical thin shells subject to axisymmetric loading. Approximate stress resultant-middle surface deformation relations based on an n-power creep law are used. Solutions are given for deformation rates and stress resultants in a long cylinder with fixed ends under uniform radial loading and uniform internal pressure. Quantities important for design purposes are found to be reasonably well predicted from the linear elastic solution for a useful range of n values.

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