Study of Fluid–Structure Interaction in a Functionally Graded pH-Sensitive Hydrogel Micro-Valve

2020 ◽  
Vol 12 (05) ◽  
pp. 2050057 ◽  
Author(s):  
Hashem Mazaheri ◽  
Amir Ghasemkhani ◽  
Soroush Sabbaghi
Keyword(s):  
Fluid Structure Interaction ◽  
Fem Analysis ◽  
Ph Sensitive ◽  
Functionally Graded ◽  
Third Party ◽  
Smart Devices ◽  
Cross Linking ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Significant Difference

In this work, fluid–structure interaction (FSI) simulations, as well as non-FSI ones, are conducted to study the behavior of a functionally graded (FG) pH-sensitive micro-valve. The FEM analysis of the hydrogel is performed in ABAQUS while the fluid domain is analyzed in ANSYS fluent. To investigate the FSI and FG effects, both FSI and non-FSI simulations are performed for pH-sensitive micro-valve with homogeneous cross-linking distribution beside the FG cases. Two simulation domains are coupled by using a third-party software named MpCCI for both FSI and non-FSI simulations. For the FG hydrogel, linear and exponential property distributions are considered. The obtained results show a significant difference between the FG and homogeneous hydrogel behavior for both simulation methods. Additionally, the results emphasize that FSI consideration has a crucial role in the design of these smart devices. Especially, remarkable difference is observed for the closing pH of the micro-valve as well as the flow-rate diagrams. For example, a leakage is observed in FSI simulations for the closing pH of the non-FSI simulations that indicates the importance of the FSI effect. Finally, the effect of the cross-linking density distribution and the inlet pressure of micro-valve are studied and the results are analyzed.

Free Vibration and Thermal Fluid Structure Interaction Simulation of Functionally Graded Pipe by Modeling As Layered Structure

2020 ◽  
Author(s):  
Ziyi Su ◽  
Kazuaki Inaba ◽  
Amit Karmakar ◽  
Apurba Das
Keyword(s):  
Free Vibration ◽  
Layered Structure ◽  
Volume Fraction ◽  
Fluid Structure Interaction ◽  
Functionally Graded ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Layered Model ◽  
Piping Systems ◽  
Complex Phenomena

Abstract Functionally graded materials (FGMs) are advanced class of composite materials which can be used as the thermal barrier to protect inner components from the outside high temperature environment. In FGMs, the volume fraction of each constituent can be tailored made across the thickness for desired applications. In this work, the simulation of FGMs in pipes is considered. Despite the wide application of pipes in machinery, those pipes would suffer from many safety problems, such as thermal stress, cavitation, fracture etc. Application of FGMs to the piping systems could lead to some new solutions accounting for safety measures and higher service life. However, the complex phenomena within the fluid structure interaction are hard to describe with the theoretical solution. The visualization of results from simulation will be helpful in understanding the distribution of kinds of physical quantities within the concerned model. For the simulation, FGMs are modeled as the layered structure in the standard finite element method (FEM) package based on FGM constituent law. The free vibration of the FG pipe is simulated and the accuracy of layered model is verified by numerical calculations. Further, based on the layered model, conjugate heat transfer simulations in a heat exchanger with FGMs are conducted.

FSI and non-FSI studies on a functionally graded temperature-responsive hydrogel bilayer in a micro-channel

2021 ◽  
Author(s):  
Hashem Mazaheri ◽  
Amin Khodabandehloo
Keyword(s):  
Fluid Flow ◽  
Fem Analysis ◽  
Functionally Graded ◽  
Cross Linking ◽  
Micro Channel ◽  
Thickness Direction ◽  
Structure Interaction ◽  
Temperature Responsive ◽  
The Right ◽  
Hydrogel Bilayer

Abstract Taking into account both fluid-structure interaction (FSI) and non-FSI simulations, the deformation of a bilayer is investigated in this paper. The bilayer, which is utilized in a micro-channel, consists of a Functionally-graded (FG) temperature-responsive hydrogel layer and an incompressible elastomeric one. Allocating two different positions to the elastomeric layer, we make two different bilayers where in one of them, the elastomer layer is located on the left (LSE) and on the right (RSE) in another one. Also, to see the effect of grading, two bilayers with homogenous hydrogel layers with different amounts of cross-linking density are considered. For FG cases in which the hydrogel layer's properties vary through thickness direction, both ascending and descending arrangements are analyzed. Each simulation, whether it is FSI or non-FSI, is conducted utilizing three software. FLUENT for fluid domain examinations, ABAQUS for FEM analysis, and MpCCI to couple two aforementioned simulation domains. By extracting and comparing both simulations results, it is observed that the influence of the fluid flow is very significant and should not be ignored. Moreover, it is discovered that the fluid flow affects more the RSE configuration and also the bilayers with lower amounts of cross-linking density. Finally, we investigate how some parameters, such as inlet pressure, can affect the behavior of the bilayer.

Study on pH-sensitive hydrogel micro-valves: A fluid–structure interaction approach

2016 ◽  
Vol 28 (12) ◽  
pp. 1589-1602 ◽  
Author(s):  
Nasser Arbabi ◽  
Mostafa Baghani ◽  
Jalal Abdolahi ◽  
Hashem Mazaheri ◽  
Mahmoud Mosavi-Mashhadi
Keyword(s):  
Fluid Structure Interaction ◽  
Soft Materials ◽  
Element Model ◽  
Ph Sensitive ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Ph Values ◽  
External Forces ◽  
Interaction Approach ◽  
Ph Sensitive Hydrogel

Hydrogels are categorized as soft materials that undergo large deformation when they are subjected to even minor external forces. In this work, the performance of a variety of micro-valves, based on pH-sensitive hydrogel jackets coated on rigid pillars, is studied considering the gel deformation under fluid flow, employing fluid–structure interaction simulations. In this regard, an analytical solution to plane-strain inhomogeneous swelling of a cylindrical jacket is proposed. This is used as a tool to validate the finite element model. Then, a micro-valve consisting of one hydrogel jacket is studied in various inlet pressure and pH values performing fluid–structure interaction simulations. Thereafter, a variety of jacket patterns are investigated in order to identify the effects of the pattern on the micro-valve performance for various fluid stream pressures and pH values. The leakage pressure of the valves is also computed for each of the patterns. Fluid–structure interaction simulation is found to be essential to accurate design of the hydrogel-based microfluidic devices.

PH-sensitive hydrogel-based valves: A transient fully-coupled fluid-solid interaction study

2021 ◽  
pp. 1045389X2110116
Author(s):  
Soha Niroumandi ◽  
Mohammad Shojaeifard ◽  
Mostafa Baghani
Keyword(s):  
Fluid Structure Interaction ◽  
Planck Equation ◽  
Transient Behavior ◽  
Ph Sensitive ◽  
External Loading ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Gent Model ◽  
Fully Coupled ◽  
Ph Sensitive Hydrogel

pH-sensitive hydrogels are promising materials to be employed in microfluidic devices, especially microvalves. In this paper, a theory of transient swelling of pH-sensitive micro-valve is presented. A transient constitutive model that captures electrical, chemical, and mechanical fields is considered to model the swelling phenomenon. The diffusion of ions into the hydrogel, the electromigration, and convection are described by implementing the Nernst-Planck equation. Assuming Gent model, hydrogel is considered as a compressible hyperelastic material and osmotic pressure is assumed as an external loading. Due to benefits of in-plane valves, a design of the micro-valve is studied. Design simplicity and great sealing are vital factors which can be considered as an advantage of this valve for fabrication. This design and modeling approach has not been used for pH-sensitive hydrogels in earlier works. Thus, we have studied the transient swelling of pH-sensitive hydrogel microvalve, when effects of fluid-structure-interaction are examined on valve performance. It is noted that in most previous studies, equilibrium conditions have been assumed. While considering transient fully-coupled fluid-structure-interaction is necessary to capture a more realistic modeling. The results illustrate that the microvalve blocks the channel much earlier than reaching the equilibrium-state, which implies importance of the transient behavior of hydrogels.

scholarly journals Coupled BEM and FEM analysis of fluid-structure interaction in dual compartment tanks

2018 ◽  
Vol 6 (6) ◽  
pp. 976-988 ◽  
Author(s):  
Vasyl V. Gnitko ◽  
Kyryl G. Degtyariov ◽  
Vitaly V. Naumenko ◽  
Elena A. Strelnikova
Keyword(s):  
Fluid Structure Interaction ◽  
Fem Analysis ◽  
Fluid Structure ◽  
Structure Interaction

INVESTIGATION OF LEAFLET GEOMETRY IN A PERCUTANEOUS AORTIC VALVE WITH THE USE OF FLUID-STRUCTURE INTERACTION SIMULATION

2012 ◽  
Vol 12 (01) ◽  
pp. 1250003 ◽  
Author(s):  
K. H. J. VAN ASWEGEN ◽  
A. N. SMUTS ◽  
C. SCHEFFER ◽  
H. S. VH. WEICH ◽  
A. F. DOUBELL
Keyword(s):  
Aortic Valve ◽  
Fluid Structure Interaction ◽  
Von Mises Stress ◽  
Aortic Valves ◽  
Native Valve ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Prosthetic Valves ◽  
Significant Difference ◽  
Von Mises

Prosthetic aortic valves have been used for the replacement of dysfunctional native aortic valves in humans for more than fifty years. Current prosthetic valves have significant limitations and the development of improved aortic valve prostheses remains an important research focus area. This paper investigates one of the newer additions to the family of replacement valves, namely the stented percutaneous valve. An important design aspect of stented percutaneous valves, is the configuration of the leaflet's attachment to the surrounding stent. There are essentially two possible configurations: The first method is attaching the leaflets in a straight configuration, and the second method is to attach the leaflets in a curved configuration. Finite element models of both configurations were created, and the behavior of these configurations was then studied using a fluid-structure interaction (FSI) simulation. The FSI simulation was validated by means of comparing simulation results to actual measurements from a pulse duplicator using prototype valves of both configurations. The FSI results showed no significant difference between the valves' opening and closing behaviors. The von Mises stress distributions proved to be the largest differentiating and decisive factor between the two valves. The FSI simulations did however show that the leaflets that are attached in the straight configuration form folds that resembles that of the curved configuration as well as the native valve, but to a larger scale. The effect that these folds might have on valve tissue fatigue leaves room for future investigation.

scholarly journals BEM and FEM analysis of fluid–structure interaction in a double tank

2016 ◽  
Vol 67 ◽  
pp. 13-25 ◽  
Author(s):  
J. Ravnik ◽  
E. Strelnikova ◽  
V. Gnitko ◽  
K. Degtyarev ◽  
U. Ogorodnyk
Keyword(s):  
Fluid Structure Interaction ◽  
Fem Analysis ◽  
Fluid Structure ◽  
Structure Interaction
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