scholarly journals Pneumatically-actuated artificial cilia array for biomimetic fluid propulsion

Lab on a Chip ◽  
2015 ◽  
Vol 15 (22) ◽  
pp. 4348-4355 ◽  
Author(s):  
Benjamin Gorissen ◽  
Michaël de Volder ◽  
Dominiek Reynaerts
Keyword(s):  
Fluid Flow ◽  
Novel Approach ◽  
Artificial Cilia ◽  
Metachronal Waves

A novel approach to induce fluid flow using a cilia array with individually controlled pneumatic cilia, imposing metachronal waves.

scholarly journals Microfluidic propulsion by the metachronal beating of magnetic artificial cilia: a numerical analysis

2011 ◽  
Vol 688 ◽  
pp. 44-65 ◽  
Author(s):  
S. N. Khaderi ◽  
J. M. J. den Toonder ◽  
P. R. Onck
Keyword(s):  
Magnetic Field ◽  
Fluid Flow ◽  
Phase Difference ◽  
Rotating Magnetic Field ◽  
Artificial Cilia ◽  
Discrete Nature ◽  
Recovery Stroke ◽  
Physical Interactions ◽  
Metachronal Waves ◽  
Considerable Enhancement

AbstractIn this work we study the effect of metachronal waves on the flow created by magnetically driven plate-like artificial cilia in microchannels using numerical simulations. The simulations are performed using a coupled magneto-mechanical solid–fluid computational model that captures the physical interactions between the fluid flow, ciliary deformation and applied magnetic field. When a rotating magnetic field is applied to super-paramagnetic artificial cilia, they mimic the asymmetric motion of natural cilia, consisting of an effective and recovery stroke. When a phase difference is prescribed between neighbouring cilia, metachronal waves develop. Due to the discrete nature of the cilia, the metachronal waves change direction when the phase difference becomes sufficiently large, resulting in antiplectic as well as symplectic metachrony. We show that the fluid flow created by the artificial cilia is significantly enhanced in the presence of metachronal waves and that the fluid flow becomes unidirectional. Antiplectic metachrony is observed to lead to a considerable enhancement in flow compared to symplectic metachrony, when the cilia spacing is small. Obstruction of flow in the direction of the effective stroke for the case of symplectic metachrony was found to be the key mechanism that governs this effect.

Convergent optimal variational iteration method and applications to heat and fluid flow problems

2016 ◽  
Vol 26 (3/4) ◽  
pp. 790-804 ◽  
Author(s):  
Mustafa Turkyilmazoglu
Keyword(s):  
Fluid Flow ◽  
Iteration Method ◽  
Sufficient Conditions ◽  
Variational Iteration Method ◽  
Content Type ◽  
Flow Problems ◽  
Variational Iteration ◽  
Physical Problems ◽  
Novel Approach ◽  
Heat And Fluid Flow

Purpose – In an earlier paper (Turkyilmazoglu, 2011a), the author introduced a new optimal variational iteration method. The idea was to insert a parameter into the classical variational iteration formula in an aim to prevent divergence or to accelerate the slow convergence property of the classical approach. The purpose of this paper is to approve the superiority of the proposed method over the traditional one on several physical problems treated before by the classical variational iteration method. Design/methodology/approach – A sufficient condition theorem with an upper bound for the error is also presented to further justify the convergence of the new variational iteration method. Findings – The optimal variational iteration method is found to be useful for heat and fluid flow problems. Originality/value – The optimal variational iteration method is shown to be convergent under sufficient conditions. A novel approach to obtain the optimal convergence parameter is introduced.

A novel approach for modelling fluid flow and heat transfer in an Open Volumetric Air Receiver using ANSYS-FLUENT

Solar Energy ◽  
2020 ◽  
Vol 204 ◽  
pp. 246-255
Author(s):  
P. Sharma ◽  
L. Chandra ◽  
P.S. Ghoshdastidar ◽  
R. Shekhar
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Ansys Fluent ◽  
Flow And Heat Transfer ◽  
Novel Approach

scholarly journals Fluid flow due to collective non-reciprocal motion of symmetrically-beating artificial cilia

2012 ◽  
Vol 6 (1) ◽  
pp. 014106 ◽  
Author(s):  
S. N. Khaderi ◽  
J. M. J. den Toonder ◽  
P. R. Onck
Keyword(s):  
Fluid Flow ◽  
Artificial Cilia

scholarly journals Self-assembled artificial cilia

2009 ◽  
Vol 107 (5) ◽  
pp. 1844-1847 ◽  
Author(s):  
Mojca Vilfan ◽  
Anton Potočnik ◽  
Blaž Kavčič ◽  
Natan Osterman ◽  
Igor Poberaj ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Reynolds Number ◽  
Fluid Flow ◽  
External Magnetic Field ◽  
Low Reynolds Number ◽  
Microfluidic Devices ◽  
Superparamagnetic Particles ◽  
Artificial Cilia ◽  
Biomimetic Cilia

Due to their small dimensions, microfluidic devices operate in the low Reynolds number regime. In this case, the hydrodynamics is governed by the viscosity rather than inertia and special elements have to be introduced into the system for mixing and pumping of fluids. Here we report on the realization of an effective pumping device that mimics a ciliated surface and imitates its motion to generate fluid flow. The artificial biomimetic cilia are constructed as long chains of spherical superparamagnetic particles, which self-assemble in an external magnetic field. Magnetic field is also used to actuate the cilia in a simple nonreciprocal manner, resulting in a fluid flow. We prove the concept by measuring the velocity of a cilia-pumped fluid as a function of height above the ciliated surface and investigate the influence of the beating asymmetry on the pumping performance. A numerical simulation was carried out that successfully reproduced the experimentally obtained data.

scholarly journals Measurement of fluid flow generated by artificial cilia

2011 ◽  
Vol 5 (3) ◽  
pp. 034103 ◽  
Author(s):  
Gašper Kokot ◽  
Mojca Vilfan ◽  
Natan Osterman ◽  
Andrej Vilfan ◽  
Blaž Kavčič ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Artificial Cilia
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