The Stability and Dynamics of Elastic Structures and Fluid Flows.

1984 ◽  
Author(s):  
E. L. Reiss
Keyword(s):  
Fluid Flows ◽  
Elastic Structures ◽  
The Stability

scholarly journals Soft channel formation and symmetry breaking in exotic active emulsions

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
L. N. Carenza ◽  
G. Gonnella ◽  
A. Lamura ◽  
D. Marenduzzo ◽  
G. Negro ◽  
...  
Keyword(s):  
Shear Rate ◽  
Rheological Properties ◽  
Self Assembly ◽  
Contractile Activity ◽  
Active Material ◽  
Fluid Flows ◽  
Shear Rates ◽  
Two Phases ◽  
The Stability ◽  
Isotropic Fluid

Abstract We use computer simulations to study the morphology and rheological properties of a bidimensional emulsion resulting from a mixture of a passive isotropic fluid and an active contractile polar gel, in the presence of a surfactant that favours the emulsification of the two phases. By varying the intensity of the contractile activity and of an externally imposed shear flow, we find three possible morphologies. For low shear rates, a simple lamellar state is obtained. For intermediate activity and shear rate, an asymmetric state emerges, which is characterized by shear and concentration banding at the polar/isotropic interface. A further increment in the active forcing leads to the self-assembly of a soft channel where an isotropic fluid flows between two layers of active material. We characterize the stability of this state by performing a dynamical test varying the intensity of the active forcing and shear rate. Finally, we address the rheological properties of the system by measuring the effective shear viscosity, finding that this increases as active forcing is increased—so that the fluid thickens with activity.

scholarly journals Reinvestigation on Assessing the Stability of Mullagulov Tested Steel Rods under Follower Forces

2022 ◽  
Vol 30 (1) ◽  
pp. 801-811
Author(s):  
Jakkana Peter Praveen ◽  
Boggarapu Nageswara Rao
Keyword(s):  
Experimental Verification ◽  
Material Properties ◽  
Dynamic Instability ◽  
Experimental Investigations ◽  
Practical Realization ◽  
Elastic Structures ◽  
The Subject ◽  
Follower Forces ◽  
The Stability ◽  
Critical Overview

Dynamic instability is an interesting topic in the mechanics of elastic structures. Though the subject has been formed by many analytical, numerical, and experimental investigations, it has many issues, as evidenced from the critical overview of Elishakoff. Furthermore, the controversial articles of Koiter and Sugiyama on unrealistic and realistic follower forces demand experimental verification. Mullagulov has proposed a device for creating the follower forces and tested steel rods under compression. This paper highlights the experimentation of Mullagulov and his observations briefly to examine the influence of material properties on the stability load estimations and to confirm the practical realization of follower forces.

scholarly journals Encapsulation of Lutein via Microfluidic Technology: Evaluation of Stability and In Vitro Bioaccessibility

Foods ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2646
Author(s):  
Yuanhang Yao ◽  
Jiaxing Jansen Lin ◽  
Xin Yi Jolene Chee ◽  
Mei Hui Liu ◽  
Saif A. Khan ◽  
...  
Keyword(s):  
Bioactive Compounds ◽  
Fluid Flows ◽  
Technology Evaluation ◽  
Delivery Vehicle ◽  
Microfluidic Technology ◽  
Age Related ◽  
In Vitro Bioaccessibility ◽  
Control Fluid ◽  
The Stability

Inadequate intake of lutein is relevant to a higher risk of age-related eye diseases. However, lutein has been barely incorporated into foods efficiently because it is prone to degradation and is poorly bioaccessible in the gastrointestinal tract. Microfluidics, a novel food processing technology that can control fluid flows at the microscale, can enable the efficient encapsulation of bioactive compounds by fabricating suitable delivery structures. Hence, the present study aimed to evaluate the stability and the bioaccessibility of lutein that is encapsulated in a new noodle-like product made via microfluidic technology. Two types of oils (safflower oil (SO) and olive oil (OL)) were selected as a delivery vehicle for lutein, and two customized microfluidic devices (co-flow and combination-flow) were used. Lutein encapsulation was created by the following: (i) co-flow + SO, (ii) co-flow + OL, (iii) combination-flow + SO, and (iv) combination-flow + OL. The initial encapsulation of lutein in the noodle-like product was achieved at 86.0 ± 2.7%. Although lutein’s stability experienced a decreasing trend, the retention of lutein was maintained above 60% for up to seven days of storage. The two types of device did not result in a difference in lutein bioaccessibility (co-flow: 3.1 ± 0.5%; combination-flow: 3.6 ± 0.6%) and SO and OL also showed no difference in lutein bioaccessibility (SO: 3.4 ± 0.8%; OL: 3.3 ± 0.4%). These results suggest that the types of oil and device do not affect the lutein bioaccessibility. Findings from this study may provide scientific insights into emulsion-based delivery systems that employ microfluidics for the encapsulation of bioactive compounds into foods.

scholarly journals An efficient finite-volume method to study the interaction of two-phase fluid flows with elastic structures

2018 ◽  
Vol 83 ◽  
pp. 54-71 ◽  
Author(s):  
Pedro J. Martínez-Ferrer ◽  
Ling Qian ◽  
Zhihua Ma ◽  
Derek M. Causon ◽  
Clive G. Mingham
Keyword(s):  
Finite Volume Method ◽  
Finite Volume ◽  
Fluid Flows ◽  
Elastic Structures ◽  
Two Phase ◽  
Volume Method ◽  
Phase Fluid

On the foundation of the stability theory of elastic structures

Meccanica ◽  
1975 ◽  
Vol 10 (3) ◽  
pp. 171-177
Author(s):  
Mario Como ◽  
Antonio Grimaldi
Keyword(s):  
Stability Theory ◽  
Elastic Structures ◽  
The Stability

On Modelling The Stability Of Fluid Flows In Compliant Pipes Applied To Hemodynamic Problems

2015 ◽  
Vol 10 (4) ◽  
pp. 29-42
Author(s):  
Andrey Boiko
Keyword(s):  
Hydrodynamic Instability ◽  
Fluid Flows ◽  
Physical Models ◽  
Compliant Walls ◽  
The Stability

The study is directed to formulate physical models adequate to describe mechanisms of interactions of compliant walls of pipes and hydrodynamic disturbances aiming to reveal the conditions responsible for hydrodynamic instability in hemodynamic problems.

scholarly journals Stability of Individuals during Urban Inundations: What Should We Learn from Field Observations?

Geosciences ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 341 ◽  
Author(s):  
Hubert Chanson ◽  
Richard Brown
Keyword(s):  
Real Life ◽  
Fluid Flows ◽  
Field Measurements ◽  
Topographic Effects ◽  
Hydrodynamic Instabilities ◽  
Flood Events ◽  
Flow Conditions ◽  
Life Impact ◽  
Flood Flows ◽  
The Stability

The flooding of urbanized areas constitutes a major hazard to populations and infrastructure. Flood flows during urban inundations have been studied only recently and the real-life impact of fluid flows on individuals is not well understood. The stability of individuals in floodwaters is re-assessed based upon the re-analysis of detailed field measurements during a major flood event. The results emphasized that hydrodynamic instabilities, linked to local topographic effects and debris, constitute major real-world hazards. A comparison between a number of flow conditions deemed unsafe for individuals, along with guidelines, suggests that many recommendations are over-optimistic and unsafe in real floodwaters and natural disasters. A series of more conservative guidelines is proposed, particularity relevant to flood events.

Sign in / Sign up

Export Citation Format

Share Document